An improved process for preparation of broflanilide

Abstract

The present invention relates to an improved process for the preparation of m-diamide compound. More particularly, the present invention relates to an improved process for preparation of Broflanilide of Formula (I). Further, the present invention relates to an agrochemical composition, wherein the composition comprises at least a bio-active effective amount of Broflanilide of formula (I) as obtained by the process disclosed in present invention. Furthermore, the present invention also relates to a process for preparing the agrochemical composition comprising Broflanilide of formula (I) of the present invention.

Description

[0001]AN IMPROVED PROCESS FOR PREPARATION OF BROFLANILIDE FIELD OF THE INVENTION The present invention relates to a process for the preparation of an insecticidal m-diamide compound. More particularly, the present invention relates to an improved process for preparation of Broflanilide of Formula (I). The improved process in relation to the present invention is a consistently reproducible process, which results in high yield, purity of Broflanilide apart from resulting into stable form of Broflanilide. BACKGROUND OF THE INVENTION Broflanilide belongs to a meta-diamide class of compound and has a chemical name as 3- [benzoyl(methyl)amino]-N-[2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6- (trifluoromethyl)phenyl]-2-fluorobenzamide and the structural formula (I) as follows: Structure of Broflanilide Formula (I) Broflanilide (I) is an insecticide with a novel mechanism of action jointly developed by Japan's Mitsui Agrichemicals Co., Ltd. and BASF. It is mainly used in fruits and vegetables, beans, cotton, corn, cereals, flowers and non-crop applications, for the control Lepidoptera, Coleoptera, termites, ants, cockroaches, flies and other pests. Broflanilide (I) insecticide works by preventing transmissions within the nervous system, which over excites the system and incapacitates the insect. It is fast-acting and quickly works across all insect life stages, providing excellent, long-lasting control of insects like hard-to- control wireworms. Broflanilide (I) exhibits high larvicidal activity against Spodoptera litura. Broflanilide (I) not only has efficient insecticidal activity against pests chewing crops such as Lepidoptera and Coleoptera, but also can effectively control pests that are resistant to other insecticides, especially pests. Various prior art documents are known to disclose the preparation of amide derivative compounds such as Broflanilide (Compound I). For instance, International Patent Applications WO2010 / 018857 and WO2017 / 104838 describe synthetic routes for the preparation of Broflanilide. However, without being limited to the specific methodologies disclosed therein, the processes described in these references typically result in low yields and impure final products, and further involve the use of costly and hazardous reagents, such as perfluorinated alkyl halides. In contrast, the present invention provides an improved process that overcomes these drawbacks by employing hexafluoroacetone (HFA)—a commercially available, more economical, and operationally convenient reagent for introducing perfluorinated moieties. The process of the present invention is not only cost-effective but also results in higher yield, improved purity, and is more amenable to industrial scale-up.Further, intermediate amide derivative has been disclosed in the Japanese patent application JP2012153635A wherein, heptafluoroisopropyl iodide was reacted with 2-(trifluoromethyl) aniline in a solvent mixture of water and ethyl acetate under the catalysis of the phase transfer catalyst with the pH controlled to 4.9-5.0 by sodium carbonate solution and 85% conversion was achieved. Also, the reaction system of said application is more complicated, and the pH of the reaction needs to be strictly controlled to achieve 85% conversion. Slight variation in pH could lead to lower conversion. Also, the prior art uses expensive heptafluoroisopropyl iodide as alkylating agent which makes the process economically not viable. The present invention uses Hexafluoroacetone, commercially available, and comparatively more economic reagent for perfluorination. In the Indian patent application IN201611011512A, 2-bromoheptafluoropropane is employed as a substitute for heptafluoroisopropyl iodide, and the reaction is carried out at a temperature of approximately 15°C, with other process steps being similar to those described in earlier Japanese patent publications. In this process, hydrogen chloride (HCl) gas is bubbled into the crude reaction mixture to afford 4-(perfluoropropan-2-yl)-2-trifluoromethylaniline hydrochloride, albeit in low yield. Furthermore, the use of 2-bromoheptafluoropropane, a high-cost reagent, renders the overall process economically unfavorable for large-scale industrial application. In contrast, the present invention circumvents this limitation by employing hexafluoroacetone, a commercially available and cost-effective alternative, thereby enhancing the process's economic viability and synthetic efficiency.Thus, the prior art processes for the preparation of amide derivative compounds, such as Broflanilide, generally suffer from several limitations. These include the use of expensive reagents, such as perfluorinated alkyl iodides or perfluorinated alkyl bromides, and often involve complex, multi-step, and time-consuming procedures. As a result, these processes frequently lead to lower yields, reduced purity, and in some cases, limited stability of the final compound. Moreover, many of the disclosed methods fail to consistently deliver high yields of the active ingredient, thereby making them unsuitable for cost-effective and scalable industrial production. Therefore, there is a need to overcome the problems associated with the prior arts, and to develop a production process, which involves readily available reagents, has an effective synthesis step, high reaction efficiency, few impurities, little pollution and avoids the use of highly toxic and highly polluting raw materials. Thus, the present invention aims to develop a process for the preparation of the Broflanilide in view of the deficiencies of the methods reported in the prior arts, and to improve the process route and use low-risk chemicals instead of high-risk chemicals from the perspective of production safety. The present invention thus satisfies the existing needs, as well as others, and generally overcomes the deficiencies found in the prior arts. OBJECTIVE AND ADVANTAGES OF THE INVENTION The principal objective of the present invention is to provide an improved and operationally straightforward process for the preparation of Broflanilide of Formula (I), which does not require the use of highly specialized equipment, and enables production with enhanced efficiency and reduced environmental impact. The process disclosed herein further avoids the use of highly toxic or hazardous reagents, thereby making it safer and more suitable for scale- up in industrial settings. Additionally, the present invention utilizes cost-effective and commercially available reagents, such as hexafluoroacetone, offering a more economical and practical alternative to conventional processes that rely on expensive perfluorinated alkyl halides. Another objective of the present invention is to provide a novel and effective process for preparation of Broflanilide of formula (I), with reduced and / or minimal waste generation. Another objective of the present invention is to develop a process for the preparation of Broflanilide of formula (I), that involves the usage of less expensive and readily available reagents and solvents. Another objective of the present invention is to develop a process for the preparation of Broflanilide of formula (I), with minimized side reaction and / or minimum formation of by- products. A further object of this invention is to provide a process for the preparation of Broflanilide of formula (I), by coupling a compound of formula (B-5), 2-fluoro-3-(N-methyl benzamido)benzoic acid or 3-(Benzoyl-methyl-amino)-2-fluorobenzoic acid, with a compound of formula (A-5), i.e., 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6- (trifluoromethyl)aniline in the presence of carbonyldiimidazole, a base, an additive like but not limited to 1,4-Diazabicyclo[2.2.2]octane (DABCO), Quinuclidine, 1,8- diazabicyclo[5.4.0]undec-7-ene(DBU), 7-Methyl-1,5,7-triazabicyclo(4.4.0)dec-5-ene (MTBD), 1,5,7-Triazabicyclo(4.4.0)dec-5-ene (TBD), and a suitable solvent. A further object of this invention is to provide a process for the preparation an intermediate compound of formula (A-5), i.e., 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6- (trifluoromethyl)aniline, by the sequential reactions starting from the compound of formula (A- 1), i.e., 2-Nitrobenzotrifluoride. A further object of this invention is to provide a process for the preparation an intermediate compound of formula (B-5), i.e., 2-fluoro-3-(N-methyl benzamido)benzoic acid, by the sequential reactions starting from the compound of formula (B-1), i.e., 2-Chlorobenzoic acid. Another objective of the present invention is to obtain a compound (A-4), i.e., 4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-2-(trifluoromethyl)aniline, by halogenating the compound (A-3), i.e., 2-[4-amino-3-(trifluoromethyl)phenyl]-1,1,1,3,3,3-hexahalopropan-2-ol in the presence of halogenating agents and a suitable solvent. Another objective of the present invention is to obtain a compound (B-4), i.e., 3-amino-2- fluorobenzoic acid, by amination of a compound (B-3), i.e., 3-Bromo-2-fluorobenzoic acid. Another objective of the present invention is to obtain a compound (B-5), i.e., 3-(Benzoyl- methyl-amino)-2-fluorobenzoic acid, by reacting the compound (B-4), i.e., 3-amino-2- fluorobenzoic acid with benzoyl chloride in suitable solvents followed by alkylation in the presence of an alkylating agent, and a suitable solvent. Some or all these and other objects of the invention can be achieved by way of the invention described hereinafter. Advantages of the present invention are as: 1. The process of the present invention involves the usage of less expensive and readily available reagents and solvents, suitable for commercial scale. 2. The solvents utilized in the process of the present invention are less expensive and can be recovered and reused. Therefore, the process of the present invention is suitable for commercial scale. 3. Reduced time for carrying out the reaction. 4. The process of the present invention involves minimized side reaction or formation of by-products, leading to highly pure and stable form of Broflanilide with high purity and high yield that too by utilizing simple, cost effective and consistently reproducible process. 5. The process of the present invention involves use of less expensive, commercially available hexafluroacetone for perfluorination, in order to produce high yield intermediates and final product along with the high purity, which in itself provides an economic approach to the present invention, making it more technically as well as economically significant in view of the processes as mentioned in the prior arts. SUMMARY OF THE INVENTION Accordingly, the main aspect of the present invention is to provide an improved process for the preparation of Broflanilide of formula (I). Provided herein is simple, cost effective and consistently reproducible process for the preparation of highly pure and stable form of Broflanilide. In an aspect, the present invention provides an improved process for the preparation of Broflanilide of formula (I), using cost effective and readily available reagents. In an aspect, the present invention provides a process for the preparation of Broflanilide of formula (I), which comprises the steps of: i. reacting a compound of formula (A-1), i.e., 2-Nitrobenzotrifluoride, by way of sequential reaction to obtain a compound of formula of formula (A-5), i.e., 2-bromo-4- (1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline; ii. reacting a compound of formula (B-1), i.e., 2-Chlorobenzoic acid, by way of sequential reaction to obtain a compound of formula (B-5), i.e., 3-(Benzoyl-methyl-amino)-2- fluorobenzoic acid or 2-fluoro-3-(N-methyl benzamido) benzoic acid ; iii. condensing the intermediate compound (A-5) with (B-5) in the presence of carbonyldiimidazole, a base, an additive and a solvent to obtain Broflanilide compound of formula (I). In an aspect, an intermediate compound of formula (A-5), i.e., 2-bromo-4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline, is obtained by the sequential reactions starting from the compound of formula (A-1), i.e., 2-Nitrobenzotrifluoride. In an aspect, an intermediate compound of formula (B-5), i.e., 3-(Benzoyl-methyl-amino)-2- fluorobenzoic acid, is obtained by the sequential reactions starting from the compound of formula (B-1), i.e., 2-Chlorobenzoic acid. In an aspect, the compound (A-4), i.e., 4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-2- (trifluoromethyl)aniline or 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl-ethyl)-2-trifluoromethyl- phenylamine, is obtained by halogenating the compound (A-3), i.e., 2-[4-amino-3- (trifluoromethyl)phenyl]-1,1,1,3,3,3-hexahalopropan-2-ol in the presence of halogenating agents and a suitable solvent. In an aspect, the compound (B-4), i.e., 3-amino-2-fluorobenzoic acid, is obtained by amination of a compound (B-3), i.e., 3-Bromo-2-fluorobenzoic acid. In an aspect, the compound (B-5), i.e., 3-(Benzoyl-methyl-amino)-2-fluorobenzoic acid, is obtained by converting the compound (B-4), i.e., 3-amino-2-fluorobenzoic acid to its ester and then reacting with benzoyl chloride in suitable solvents followed by alkylation in the presence of an alkylating agent, and base a suitable solvent and hydrolysis. DETAILED DESCRIPTION OF THE INVENTION At the very outset of the detailed description, it may be understood that the ensuing description only illustrates a particular form of this invention. However, such a particular form is only exemplary embodiment, and without intending to imply any limitation on the scope of this invention. Accordingly, the description is to be understood as an exemplary embodiment and teaching of the invention and not intended to be taken restrictively. The technical solutions of the present disclosure will be further described below by way of specific embodiments. It will be apparent to those skilled in the art that the embodiments are merely illustrations of the present disclosure and should not be construed as specific limitations to the present disclosure. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the present disclosure. Certain ranges are presented herein with numerical values being preceded by the term “about”. The term “about” is used herein to provide literal support for the exact number that it precedes, as well as a number that is near to or approximately the number that the term precedes. In determining whether a number is near to or approximately a specifically recited number, the near or approximately unrecited number may be a number which in the context in which it is presented, provides the substantial equivalent of the specifically recited number. In an embodiment, “about” can mean within one or more standard deviations, or within ±30%, 25%, 20%, 15%, 10%, or 5% of the stated value. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the invention belongs. Although any process and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, preferred process is described. For the purposes of the present invention, the following terms are defined below: The articles “a” and “an” are used herein to refer to one or to more than one (i.e., to at least one) of the grammatical object of the article. By way of example, “an element” means one element or more than one element. As used herein, the terms, “including”, “includes”, “comprising”, and comprises” mean “including without limitation” and shall not be construed to limit any general statement that it follows to the specific or similar items. Each embodiment is provided by way of explanation of the invention and not by way of limitation of the invention. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made to the process described herein without departing from the scope of the invention. For instance, features illustrated or described as part of one embodiment can be applied to another embodiment to yield a still further embodiment. While several embodiments of the present invention have been described and illustrated herein, those of ordinary skill in the art will readily envision a variety of other means and / or structures for performing the functions and / or obtaining the results and / or one or more of the advantages described herein, and each of such variations and / or modifications is deemed to be within the scope of the present invention. Moreover, other than in any operating examples, or where otherwise indicated, all numbers expressing, for example, quantities of materials / ingredients used in the specification are to be understood as being modified in all instances by the term "about". The term "about" shall be interpreted to mean "approximately" or "reasonably close to" and any statistically insignificant variations therefrom. Conventional methods for the preparation of Broflanilide are associated with drawbacks such as ow yield with impurities and the process involves expensive reagents, complex and complicated reaction system in the conventional methods, and the pH of the reaction needs to be strictly controlled. Prior art processes for preparing amide derivative compound, are not just complicated, and / or time- consuming preparation process resulting in lesser yield and purity of the final compound Broflanilide and which is also not stable in some of the cases. In an embodiment, the present invention provides an improved process for the preparation of m-diamide of Formula (I). In one of the embodiments, the present invention provides an improved process for the preparation of Broflanilide of Formula (I). In one of the embodiments, the present invention related to a simple and cost-effective method for the preparation of Broflanilide of Formula (I). In yet another embodiment, the present invention provides a process for the preparation of Broflanilide of formula (I), which comprises the steps of: a. reacting a compound of formula (A-1), i.e., 2-Nitrobenzotrifluoride, by way of sequential reaction to obtain a compound of formula of formula (A-5), i.e., 2-bromo-4- (1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline; b. reacting a compound of formula (B-1), i.e., 2-Chlorobenzoic acid, by way of sequential reaction to obtain a compound of formula (B-5), i.e., 3-(Benzoyl-methyl-amino)-2- fluorobenzoic acid; c. condensing the intermediate compound (A-5) with (B-5) in the presence of carbonyldiimidazole, a base, an additive and a solvent to obtain Broflanilide compound of formula (I). The process of the present invention is represented by way of following Scheme: In an embodiment, Broflanilide compound of Formula (I) is obtained by coupling the intermediate (B-5), i.e., 3-(Benzoyl-methyl-amino)-2-fluorobenzoic acid, with rightly substituted aniline compound with formula (A-5), i.e., 2-bromo-4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline (Scheme 1), by employing reagents like but not limited to carbonyldiimidazole in the presence of a base like but not limited to sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium hydride, trimethylamine, 1,8-Diazabicyclo(5.4.0)undec-7-ene (DBU), an additiveand solvents like but not limited to N,N-Dimethylformamide (DMF), Methylisobutyl ketone (MIBK), ethylene dichloride (EDC), methylenedichloride (MDC), chlorobenzene, tetrahydrofuran (THF), toluene, Xylene, heptane. Scheme 1: A-5 B-5Broflanilide (Formula I)In one of the embodiments, the intermediate with formula (A-5), i.e., 2-bromo-4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline, is synthesized by sequential reactions starting from a compound of formula (A-1), i.e., 2-Nitrobenzotrifluoride (Scheme 2, PART- A), wherein, the compound (A-1) is reduced under the reaction conditions well known to the skilled in the art to furnish a compound of formula (A-2), i.e., 2-(trifluoromethyl)aniline. The said reduction is carried out at a temperature range of 0oC to 200oC for a period of 1 hour to 24 hours, at pressure ranging from 1-bar to 10 bar. The more preferred temperature range is from 25oC to 200oC and at pressure from atmospheric to 10 bar. In another embodiment, the compound (A-2) is reacted with hexahaloacetone to obtain a compound with formula (A-3), i.e., 2-[4-amino-3-(trifluoromethyl)phenyl]-1,1,1,3,3,3- hexahalopropan-2-ol. The said reaction is carried out at a temperature range of -10oC to 150oC for a period of 1 hour to 24 hours and the hexahaloacetone is hexafluoroacetone. The more preferred temperature range is from -10oC to 120oC and at pressure of from an atmospheric pressure to 10 bar. In another embodiment, the compound (A-3) is halogenated in the presence of halogenating agents like but not limited to bromine, chlorine, fluorine, iodine, hydrogen bromide, hydrogen chloride, potassium fluoride, selectfluorTM, Diethylaminosulfur Trifluoride (DAST) and alike in solvents like but not limited to N, N-Dimethylformamide (DMF), Methylisobutyl ketone (MIBK), tetrahydrofuran (THF), toluene, Xylene, Ethylenedichloride, heptane to obtain a compound of formula (A-4), i.e., 4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-2- (trifluoromethyl)aniline. In another embodiment, the compound (A-4) is halogenated in the presence of a halogenating agents like but not limited to bromine, chlorine, fluorine, iodine, N-Bromosuccinimide (NBS), N-Chlorosuccinimide (NCS), 1,3-Dibromo-5,5-dimethylhydantoin , Sodium bromide (NaBr), Thionyl chloride wherein the halogenating agent is combined with acetic acid, water, and / or H2O2or combination thereof, and in the presence or absence of free radical initiators like but not limited to benzoyl peroxide, di-tert-butyl peroxide, azobisisobutyronitrile (AIBN), tert- Butyl hydroperoxide to obtain a compound of formula (A-5), i.e., 2-bromo-4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline. Scheme 2: In one of the embodiments, the intermediate (B-5), i.e., 3-(Benzoyl-methyl-amino)-2- fluorobenzoic acid is synthesized from the compound (B-1), i.e., 2-chlorobenzoic acid by sequential reactions (Scheme-3, PART-B). The intermediate (B-1) is fluorinated with the fluorinating agents like potassium fluoride and alike to obtain 2-Fluorobenzoic acid (B-2). The said fluorination is carried out at a temperature range of -10oC to 200oC for a period of 1 hour to 24 hours. The more preferred temperature range is from 25oC to 150oC and at pressure of from atmospheric pressure to 10 bar. In another embodiment, the compound (B-2) is halogenated in the presence of the halogenating reagents like but not limited to chlorine gas, bromine, fluorine, iodine, N-Bromosuccinimide (NBS), N-Chlorosuccinimide (NCS), 1,3-Dibromo-5,5-dimethylhydantoin, Sodium bromide (NaBr), Thionyl chloride wherein, the halogenating agent is in combination with acetic acid, hydrogen and / or hydrogen peroxide or combination thereof, with or without radical initiators known in the art to furnish compound (B-3), i.e., 3-Bromo-2-fluorobenzoic acid. The said halogenation is carried out at a temperature range of 25oC to 200oC for a period of 1 hour to 24 hours. The more preferred temperature range is from 25oC to 150oC and at pressure of from atmospheric pressure to 10 bar. In another embodiment, the compound (B-3) is amidated using but not limited to ammonia gas, aqueous ammonia, ammonium acetate, ammonium formate either at atmospheric pressure or under pressure in autoclave using varying pressures from 1 bar to 50 bar and temperatures ranging from 250C to 150oC to obtain a compound (B-4), i.e., 3-amino-2-fluorobenzoic acid, either neat or using suitable solvents. In another embodiment, the compound (B-4) is converted to the corresponding ester and then reacted with benzoyl chloride in suitable solvents followed by alkylation in the presence of an alkylating agent like but not limited to dimethyl sulfate, dimethyldisulfide, methyl iodide, methyl chloride, methyl bromide, dialkyl sulfate, dialkyl disulfide, alkyl iodide, alkyl chloride, alkyl bromide or combination thereof, in the presence of the base like but not limited to sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, n-butyl lithium and a suitable solvent followed by ester hydrolysis to obtain the intermediate (B-5), i.e., 3- (Benzoyl-methyl-amino)-2-fluorobenzoic acid. Scheme 3: In another embodiment, the compound (A-4), i.e., 4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-2- (trifluoromethyl)aniline is obtained by halogenating the compound (A-3), i.e., 2-[4-amino-3- (trifluoromethyl)phenyl]-1,1,1,3,3,3-hexahalopropan-2-ol in the presence of halogenating agents like but not limited to bromine, chlorine, fluorine, iodine, hydrogen bromide, hydrogen chloride, potassium fluoride, selectfluorTM, Diethylaminosulfur Trifluoride (DAST) and alike in solvents like but not limited to N, N-Dimethylformamide (DMF), Methylisobutyl ketone (MIBK), tetrahydrofuran (THF), toluene, Xylene, Ethylenedichloride, heptane In another embodiment, the compound (B-4), i.e., 3-amino-2-fluorobenzoic acid is obtained by amination of a compound (B-3), i.e., 3-Bromo-2-fluorobenzoic acid in the presence of but not limited to ammonia gas, aqueous ammonia, ammonium acetate, ammonium formate either at atmospheric pressure or under pressure in autoclave using varying pressures from 1 bar to 50 bar and temperatures ranging from 250C to 150oC, either neat or in the presence of a suitable solvents. In another embodiment, the compound (B-5), i.e., 3-(Benzoyl-methyl-amino)-2-fluorobenzoic acid is obtained by converting the compound (B-4), i.e., 3-amino-2-fluorobenzoic acid to the corresponding ester and then reacting with benzoyl chloride in suitable solvents followed by alkylation in the presence of an alkylating agent like but not limited to dimethyl sulfate, dimethyldisulfide, methyl iodide, methyl chloride, methyl bromide, dialkyl sulfate, dialkyl disulfide, alkyl iodide, alkyl chloride, alkyl bromide or combination thereof, in the presence of the base like but not limited to sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, n-butyl lithium and a suitable solvent followed by ester hydrolysis. In one embodiment of the present invention, the base is selected from the group comprising of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium hydride, trimethylamine, 1,8- Diazabicyclo(5.4.0)undec-7-ene (DBU), or combination thereof. In one embodiment of the present invention, the suitable solvent selected from the group comprising of N,N-Dimethylformamide (DMF), N-Methyl-2-pyrrolidone (NMP) , N,N- Dimethylacetamide (DMAc), Methylisobutyl ketone (MIBK), ethylene dichloride (EDC), methylenedichloride (MDC), chlorobenzene, tetrahydrofuran (THF), toluene, Xylene, heptane or combination thereof. In one of the embodiments, the halogenating agent is selected from the group comprising of chlorine gas, bromine, fluorine, iodine, Sodium bromide (NaBr), Thionyl chloride in combination with acetic acid, water, potassium N-chlorosuccinimide, N-bromosuccinimide , phosphorus pentachloride, phosphorus tribromide, chlorine dichloride, hydrogen bromide, Hydrogen peroxide, selectfluorTM, etc with or without radical initiators known in the prior art or combination thereof. In an embodiment, the halogenating agent is selected from fluorinating agent, brominating agent or chlorinating agent. In one of the embodiments, the alkylating agent is selected from the group comprising of methyl iodide, dimethyl sulfate, methyl chloride, methyl bromide, dimethylcarbonate, diazomethane, dimethyl amine, dialkyl sulfate, dialkyl disulfide, alkyl iodide, alkyl chloride, alkyl bromide etc or combination thereof. In one of the embodiments, the aminating agent is selected from the group comprising of ammonia gas, aqueous ammonia, ammonium acetate etc or combination thereof. In one of the embodiments, an improved process for the preparation of Broflanilide of formula (I), which comprising: i. reacting a compound of formula (A-1), i.e., 2-Nitrobenzotrifluoride, by way of sequential reaction to obtain a compound of formula (A-5), i.e., 2-bromo-4- (1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline; ii. reacting a compound of formula (B-1), i.e., 2-Chlorobenzoic acid, by way of sequential reaction to obtain a compound of formula (B-5), i.e., 3-(Benzoyl-methyl- amino)-2-fluorobenzoic acid; iii. condensing the compound of formula (A-5) with compound of formula (B-5) in the presence of carbonyldiimidazole, a base, an additive and a solvent to obtain Broflanilide compound of formula (I). In one of the embodiments, a process for preparation of 2-bromo-4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline (compound (A-5)) as disclosed in the present invention, by the sequential reactions which comprises: i. reducing 2-Nitrobenzotrifluoride (compound of formula A-1) to obtain 2- (trifluoromethyl)aniline (compound of formula A-2); ii. reacting the compound of formula (A-2) obtained in step (i) with hexahaloacetone to obtain, 2-[4-amino-3-(trifluoromethyl)phenyl]-1,1,1,3,3,3-hexahalopropan-2-ol, i.e., compound with formula (A-3); iii. halogenating the compound (A-3) obtained in step (ii) in the presence of halogenating agents and suitable solvents to obtain 4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-2-(trifluoromethyl)aniline , i.e., a compound of formula (A-4); iv. halogenating the compound (A-4) obtained in step (iii) in the presence of a halogenating agent combined with acetic acid, and / or H2O2 or combination thereof, to obtain 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6-(trifluoromethyl) aniline, i.e., a compound of formula (A-5). In one of the embodiments, the free radical initiators of the present invention are selected from the group comprising, but not limited to benzoyl peroxide, di-tert-butyl peroxide, azobisisobutyronitrile (AIBN), tert-Butyl hydroperoxide, or combinations thereof. In one of the embodiments, a process for preparation of 3-(Benzoyl-methyl-amino)-2- fluorobenzoic acid compound of (B-5), by sequential reactions which comprises: i. fluorinating the compound 2-chlorobenzoic acid, i.e., compound (B-1) in the presence of fluorinating agents to obtain 2-Fluorobenzoic acid, a compound (B-2); ii. halogenating, the compound (B-2) obtained in step (i) in the presence of the halogenating agents to obtain a compound (B-3), i.e., 3-Bromo-2-fluorobenzoic acid; iii. aminating the compound (B-3) obtained in step (ii), in the presence of aminating agent to obtain a compound (B-4), i.e., 3-amino-2-fluorobenzoic acid, either neat or using suitable solvents. iv. converting the compound (B-4) obtained in step (iii) to the corresponding ester, followed by reaction with benzoyl chloride in suitable solvents followed by alkylation in the presence of an alkylating agent, a base and a suitable solvent followed by ester hydrolysis to obtain the intermediate (B-5), i.e., 3-(Benzoyl- methyl-amino)-2-fluorobenzoic acid. In one of the embodiments, the base is selected from the group comprising of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium hydride, Triethyl amine, trimethylamine, 1,8- Diazabicyclo(5.4.0)undec-7-ene (DBU) or combination thereof. In one of the embodiments, the additive is selected from the group comprising of Diazabicyclo[2.2.2]octane (DABCO), Quinuclidine, 1,8-diazabicyclo[5.4.0]undec-7- ene(DBU), 7-Methyl-1,5,7-triazabicyclo(4.4.0)dec-5-ene (MTBD), 1,5,7- Triazabicyclo(4.4.0)dec-5-ene (TBD), or combinations thereof. In one of the embodiments, the suitable solvent are selected from the group comprising of N,N- Dimethylformamide (DMF), N-Methyl-2-pyrrolidone (NMP), N,N-Dimethylacetamide (DMAc), Methylisobutyl ketone (MIBK), ethylene dichloride (EDC), methylenedichloride (MDC), chlorobenzene, tetrahydrofuran (THF), toluene, Xylene, heptane, methanol, waterethyl acetate, Isopropanol or combination thereof. In one of the embodiments, the additives as disclosed in the present invention are selected from the group comprising, but not limited to 1,4-Diazabicyclo[2.2.2]octane (DABCO), Quinuclidine, 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU), 7-Methyl-1,5,7- triazabicyclo(4.4.0)dec-5-ene (MTBD), 1,5,7-Triazabicyclo(4.4.0)dec-5-ene (TBD), or combinations thereof. In one of the embodiments, the process of reducing compound of formula A-1 is carried out at a temperature range of 0oC to 200oC for a period of 1 hour to 24 hours, at pressure ranging from 1-bar to 50 bar. In one of the embodiments, the process of reacting the compound of formula (A-2) is carried out at a temperature range of -10oC to 150oC for a period of 1 hour to 24 hours. In one of the embodiments, the hexahaloacetone is selected as hexafluoroacetone. In one of the embodiments, the process of reacting the compound of formula (A-2) is carried out at a pressure from an atmospheric pressure to 50 bar. In one of the embodiments, the halogenating agent for compound (A-3) is selected from the group comprising of bromine, chlorine, fluorine, iodine, hydrogen bromide (HBr), hydrogen chloride, potassium fluoride (KF), selectfluorTM, Diethylaminosulfur Trifluoride (DAST) or combinations thereof. In one of the embodiments, the fluorinating agent is selected from potassium fluoride (KF), selectfluorTM, Diethylaminosulfur Trifluoride (DAST) and the process of fluorination is carried out at a temperature range of -10oC to 200oC for a period of 1 hour to 24 hours, and at pressure of atmospheric pressure to 50 bar. In one of the embodiments, the halogenating agents are further selected from the group comprising of chlorine, bromine, fluorine, iodine, N-Bromosuccinimide (NBS), N- Chlorosuccinimide (NCS), 1,3-Dibromo-5,5-dimethylhydantoin, Sodium bromide (NaBr), Thionyl chloride, wherein, the halogenating agent is in combination with acetic acid, and / or hydrogen peroxide or combination thereof, with or without radical initiators. In one of the embodiments, the process of halogenation is carried out at a temperature range of 25oC to 200oC for a period of 1 hour to 24 hours. And at pressure of from atmospheric pressure to 50 bar. In one of the embodiments, the aminating agent is selected from the group comprising ammonia gas, aqueous ammonia, ammonium acetate, ammonium formate, or combinations thereof. In one of the embodiments, the process of aminating the compound (B-3) is carried out at atmospheric pressure or under pressure in autoclave using varying pressures from 1 bar to 50 bar and temperatures ranging from 250C to 150oC. In one of the embodiments, the process of alkylation of step (iv) carried out in the presence of an alkylating agent selected from the group comprising dimethyl sulfate, dimethyl disulfide, methyl iodide, methyl chloride, methyl bromide, dialkyl sulfate, dialkyl disulfide, alkyl iodide, alkyl chloride, alkyl bromide or combination thereof. In one of the embodiments, base is further selected from the group comprising sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, sodium bicarbonate, potassium bicarbonate, n-butyl lithium, sodium hydride, trimethylamine, Triethyl amine, 1,8- Diazabicyclo(5.4.0)undec-7-ene (DBU), or combination thereof.. In one of the embodiments, the solvent or suitable solvent is selected from the group comprising of N,N-Dimethylformamide (DMF), N-Methyl-2-pyrrolidone (NMP), N,N- Dimethylacetamide (DMAc), Methylisobutyl ketone (MIBK), ethylene dichloride (EDC), methylenedichloride (MDC), chlorobenzene, tetrahydrofuran (THF), toluene, Xylene, heptane, methanol, water, ethyl acetate, Isopropanol or combination thereof. In one of the embodiments, the free radical initiators are selected from the group comprising benzoyl peroxide, di-tert-butyl peroxide, azobisisobutyronitrile (AIBN), tert-Butyl hydroperoxide, or combinations thereof In one of the embodiments, the process of the present invention is carried out at a temperature range of from -10oC to 200oC to obtain a compound of formula (I). In one of the embodiments, the catalyst is selected from the group comprising 5-10% Pd on Charcoal or 5% Pt on Charcoal, ZSM-5, Cu(I) salts, trichloroisocyanuric acid (TCICA), Trifluoroacetic acid, Fe (III) salts, Aluminum chloride (AlCl3), Ferric bromide (FeBr3), Ferric chloride (FeCl3), N,N-Dimethylformamide (DMF), Azobisisobutyronitrile (AIBN), , p- toluenesulfonic acid (p-TSA), HCl, Tetrabutyl ammonium bromide (TBAB), or combination thereof In one of the embodiments, the Broflanilide of Formula (I) is obtained in free form or in agrochemically acceptable salt or in formulation form. In one of the embodiments, a process for preparing an agrochemical composition comprising Broflanilide of Formula (I) as obtained by the process as disclosed in the present invention. In one of the embodiments, an agrochemical composition, wherein the composition comprises at least a bio-active effective amount of Broflanilide of Formula (I) as obtained by the process as disclosed in the present invention. In one of the embodiments, the agrochemical composition as disclosed in the present invention, further comprises one of more agrochemically acceptable excipients. In one of the embodiments, a process for preparing the agrochemical composition comprising Broflanilide of Formula (I) as disclosed in the present invention. In one of the embodiments, halogenating agent is also selected from fluorinating agent, brominating agent or chlorinating agent. In one of the embodiments, the supporting reagent for halogenating agent (preferably for brominating agent) includes, but is not limited to Sodium hypochlorite. In one of the embodiments, thionyl chloride is also used as one of the reagents in the present invention.In one of the embodiments, the present invention is carried out at a temperature range of from -10oC to 200oC to obtain a compound of formula (I). The process for preparing Broflanilide of formula (I) disclosed according to the present invention yields Broflanilide with purity of around 95% to 99% and a yield of around above 80%. According to another aspect, there is provided a process for preparing agrochemical composition comprising highly pure and stable Broflanilide obtained as per the process disclosed herein. Yet in another embodiment, agrochemical compositions comprise at least a bio-active effective amount of highly pure and stable Broflanilide obtained by the processes disclosed herein. The agrochemical compositions further contain one or more agrochemically acceptable excipients. Suitable excipients and the amounts to use may be readily determined by the formulation scientist based upon experience and consideration of standard procedures and reference works in the field. While preferred embodiments and examples have been shown and described, it is to be understood that various further modifications will be apparent to those skilled in the art. Below are the references for the compounds involved in the process of the present invention: A-1: 2-Nitrobenzotrifluoride; A-2: 2-(Trifluoromethyl)aniline A-3: 2-(4-Amino-3-trifluoromethyl-phenyl)-1,1,1,3,3,3-hexafluoro-propan-2-ol; A-4: 4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-2-(trifluoromethyl)aniline; A-5: 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline ; B-1: 2-Chlorobenzoic acid; B-2: 2-Fluorobenzoic acid; B-3: 3-Bromo-2-fluorobenzoic acid; B-3-I: 5-Bromo-2-fluoro-benzoic acid B-4: 3-Amino-2-fluorobenzoic acid; B-5: 3-(Benzoyl-methyl-amino)-2-fluorobenzoic acid; Formula I: 3-(benzoylmethylamino)-N-[2-bromo-4-[1,2,2,2-tetrafluoro-1-(trifluoromethyl) ethyl]-6-(trifluoromethyl) phenyl]-2-fluorobenzamide (Broflanilide). In one of the embodiments, wherein the preparation of 2-(Trifluoromethyl)aniline (A-2), comprises: An autoclave reactor, 2-Nitrobenzotrifluoride (A-1) is charged followed by solvent such as Methanol. Suitable catalysts such as 5% Pd / C is charged carefully to this mixture. The autoclave is closed and then flushed with Nitrogen gas 3-4 times. Nitrogen gas is removed by applying a slight vacuum and then filled with Hydrogen gas. The pressure of hydrogen gas applied is 5 Bar. Stirring is started and continued. Whenever, the pressure of hydrogen drops below Bar, hydrogen gas is refilled to make up the pressure. After completion of the reaction, hydrogen gas is vented out very carefully in water container. The reaction mass is filtered through celite and washed with solvents like methanol. Combined methanolic layer was concentrated under vacuum to furnish 2-(Trifluoromethyl)aniline. After purification, HPLC purity is found to be above 96 %, yield above 89%. In one of the embodiments, wherein the preparation of 2-(4-Amino-3-trifluoromethyl- phenyl)-1,1,1,3,3,3-hexafluoro-propan-2-ol (A-3), comprises A-2A-3A glass reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, is charged with 2-(Trifluoromethyl)aniline, and catalyst including but not limited to p- toluenesulfonic acid (p-TSA) followed by solvent such as Xylene. Suitable reagent such as Hexafluoroacetone trihydrate is added in 4 equal lots with 20 minutes gap between the two lots. After complete addition of Hexafluoroacetone trihydrate which also constitutes one of the technical advancements of the present invention; the reaction mass is stirred at room temperature for 30 mins and then refluxed for 6.5 Hrs. After 6.5 hrs, water is removed using Dean-Stark assembly. Then the solvent is removed under vacuum. The residue is dissolved in ethyl acetate and washed with saturated sodium bicarbonate, water, brine, dried over sodium sulphate and concentrated under vacuum to yield 2-(4-Amino-3-trifluoromethyl-phenyl)- 1,1,1,3,3,3-hexafluoro-propan-2-ol. After purification, HPLC purity is found to be above 97%, and yield found to be above 84%. In one of the embodiment, the suitable reagent for instance but not limited to Hexafluoroacetone trihydrate, is used for the process of conversion of A-2 to A-3 which also contributes to the technical advancement of the present invention. In one of the embodiments, wherein the preparation of 4-(1,2,2,2-Tetrafluoro-1- trifluoromethyl-ethyl)-2-trifluoromethyl-phenylamine or 4-(1,1,1,2,3,3,3-heptafluoropropan- 2-yl)-2-(trifluoromethyl)aniline (A-4), comprises: A flask fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, is charged with 2-(4-Amino-3-trifluoromethyl-phenyl)-1,1,1,3,3,3-hexafluoro-propan-2-ol followed by solvents like ethylene dichloride (EDC) and stirred. The reaction is conducted in well- ventilated fume hood under inert atmosphere. After complete dissolution, it is cooled to +10oC. Halogenating agent such as Diethylaminosulfur trifluoride (DAST) is dissolved in solvent like EDC and added dropwise over 20-40 minutes. The reaction mass is allowed to warm to room temperature on its own and stirred for 4 hr. The reaction mass is slowly poured over ice- cold water. Organic layer is separated. Aqueous layer is washed with solvents (not limited to EDC). The combined organic layer is washed with brine, dried over anhydrous sodium sulphate, filtered and concentrated under vacuum to furnish 4-(1,2,2,2-Tetrafluoro-1- trifluoromethyl-ethyl)-2-trifluoromethyl-phenylamine. After purification, HPLC purity is found to be above 96 %, and yield above 86%. In one of the embodiments, wherein the preparation of 2-Bromo-4-(1,2,2,2-tetrafluoro-1- trifluoromethyl-ethyl)-6-trifluoromethyl-phenylamine (A-5), comprises: three methods: Method A: NaClO, NaBr, HCl, catalyst such as TBAB (2.5 mol%), EDC, 0oC to rt Method B: NBS, EDC, 55-60oC Method C: HBr (48%), H2O2(50%), catalyst such as FeBr3(5 mol %), TBAB (2.5 mol%) EDC, 55-60oC Method A: A reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer is charged with 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl-ethyl)-2-trifluoromethyl- phenylamine, solvent (ethylene dichloride EDC) with catalyst such as Tetrabutyl ammonium bromide (TBAB), brominating agents such as (Sodium bromide, 10 % HCl and cooled to +5 to +10oC and Sodium hypochlorite which is used as supporting reagent for bromination (around 12% aqueous solution) is added dropwise over 2.5 hr without allowing to rise the reaction mass temperature. After complete addition of sodium hypochlorite, the reaction is stirred for another 2 hrs. The reaction mass is diluted with EDC. Both the layers are separated. The organic layer is washed with sodium thiosulphate, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under vacuum to furnish 2-Bromo-4-(1,2,2,2- tetrafluoro-1-trifluoromethyl-ethyl)-6-trifluoromethyl-phenylamine. After purification, HPLC purity is found above 94%, and Yield is found above 84%. Method B: comprises A reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer is charged with 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl-ethyl)-2-trifluoromethyl-phenylamine, ethylene dichloride (EDC) and stirred for complete dissolution. Halogenating agent such as N- Bromo succinimide (NBS) is added in a single lot and the reaction mass heated to 55-60oC. The reaction is maintained at this temperature for around 8 hrs and then filtered to remove succinimide. The solid cake is washed with solvent (EDC). The combined organic layer is washed with water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish 2-Bromo-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-6- trifluoromethyl-phenylamine. After purification, HPLC purity is found to be above 96%, and Yield is found to be above 86%. Method C, comprises: A reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer is charged with 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl-ethyl)-2-trifluoromethyl-phenylamine, ethylene dichloride (EDC), TBAB, Ferric bromide and stirred for 20 mins for homogeneous reaction mass. The reaction mass is heated at 50-55oC. Halogenating agent (HBr), hydrogen peroxide are added dropwise simultaneously at almost the same rate over 3.5 hr. The reaction is monitored by HPLC and TLC. After the complete addition, the reaction mass is maintained at the same temperature for 11 hrs and then cooled to room temperature. The organic layer is separated. Aqueous layer is washed with EDC. The combined organic layer is washed with water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish 2-Bromo-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-6-trifluoromethyl- phenylamine. After purification, HPLC purity is found to be above 97%, and yield above 82%. In one of the embodiments, wherein the process of preparation of 2-Fluorobenzoic acid (B-2), comprises: 1. SOCl2, EDC 2. KF, NMP, 145-150oC 3. H3O+ A reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer is charged with 2-Chlorobenzoic acid, solvent like ethylene dichloride (EDC), N,N- Dimethylformamide. The mixture is stirred for 20 mins. Thionyl chloride is added dropwise at room temperature. After complete addition, the reaction mass is briefly refluxed for complete conversion of acid to the acid chloride. After complete conversion, ethylene chloride is distilled off. To the same reactor, N-Methyl-2-pyrrolidone (NMP) is added. Potassium fluoride is added. The reaction mass is heated to 145-150oC for 7.5 hrs. Then, the reaction mass is cooled to room temperature. The reaction mass is added dropwise under vigorous stirring to ice cold aqueous hydrochloric acid without allowing to rise the temperature beyond room temperature. The solid is separated out and filtered. The solid is washed with ice-cold water till the filtrate was neutral to pH. The solid is dried till constant weight. HPLC purity is found to be above 96 %, and yield is found to be above 81%. In one of the embodiments, wherein the process of preparation of 3-Bromo-2-fluorobenzoic acid (B-3), comprises: A reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer is charged with 2-fluorobenzoic acid, N,N-Dimethylformamide (DMF), The mixture is stirred for 20 mins and heated to 85-87oC. Halogenating agent such as N-Bromo succinimide (NBS) is added in 10 equal lots; each lot is separated by 20 minutes. After complete addition of NBS, the reaction is maintained at the same temperature for 7.5 hrs and then cooled to 70-75oC. DMF is distilled under reduced pressure. The residue is cooled to 40-45oC then diluted with solvent (ethylene dichloride). Succinimide is filtered and the solid cake is washed with EDC. The combined organic layer is washed with sodium thiosulphate aqueous solution, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish mixture of 3-Bromo-2-fluorobenzoic acid (B-3) and 5-Bromo-2-fluorobenzoic acid (B- 3-I). The desired compound, 3-Bromo-2-fluoro-benzoic acid (B-3) by fractional crystallization. After purification, HPLC purity is found to be above 94%, Yield is found to be above 64%. In one of the embodiments, wherein the process of preparation of 3-Amino-2-fluorobenzoic acid (B-4), comprises: Amination Autoclave reactor is charged with solvent like (Ethylene dichloride EDC) and 3-Bromo-2- fluorobenzoic acid followed by Tetrabutylammonium bromide. Ammonia is charged under stirring. The reactor is closed and checked for no-leakages. The reaction mass is heated at 75- 80oC for 9 hrs. The reaction progress is monitored by HPLC and TLC. After completion of the reaction, the reactor is cooled to room temperature. Ammonia gas if any is slowly released into water and the reactor is opened. The reaction mass is diluted with water and EDC and then transferred to separatory funnel to separate the layers. Both the layers are separated. Aqueous layer is washed with EDC. The combined organic layer is washed with sodium thiosulphate aqueous solution, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish 3-Amino-2-fluorobenzoic acid (B-4). After purification, HPLC purity is found to be above 96%, Yield is found to be above 80%. In one of the embodiments, wherein the process of preparation of 3-(Benzoyl-methyl-amino)- 2-fluorobenzoic acid (B-5), comprises: 4. NaOH, Water:MeOH (1:1) B-4 B-5 A reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, Calcium chloride guard tube is charged with solvent like methanol and Compound B-4. Catalytic amount of N,N-Dimethylformamide is added. The reaction mass is cooled to 10-20oC and thionyl chloride is added dropwise under stirring. After complete addition of thionyl chloride, the reaction mass is brought to room temperature and then refluxed for 30 mins. After cooling, solvent and other volatiles are removed under reduced pressure to yield Methyl 3-Bromo-2- fluorobenzoate. Yield: is found to be above, 95 %. Without any purification, the material was used for next step. A reactor fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, Calcium chloride guard tube is charged with ethylene chloride and Methyl 3-Bromo-2-fluorobenzoate thus obtained under stirring at room temperature. Base such as (Triethyl amine) is charged in a single lot. Benzoyl chloride is added dropwise and continuously while keeping the reaction mass temperature below 40oC. The reaction mass is stirred at room temperature for 2 hrs and then it is diluted with slow addition of ice-cold water. Both the layers are separated using separatory funnel. Aqueous layer is washed with solvent like (EDC). The combined organic layer is washed with sodium thiosulphate aqueous solution, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to provide Methyl 3- Benzoylamino-2-fluoro-benzoate. After purification, HPLC purity is found to be above 95%, Yield above 88%. A flask equipped with condenser, thermometer pocket, thermometer, mechanical stirrer, is charged with dry Tetrahydrofuran. The reactor is blanketed with nitrogen gas. Base such as Sodium hydride freed from the oil is added very carefully to the flask containing the solvent. The suspension is stirred briefly. Methyl 3-Benzoylamino-2-fluoro-benzoate is dissolved in dry THF and is added dropwise. Evolution of the gas is seen. After complete addition, the reaction mass is stirred briefly. Alkylating agent such as Methyl iodide is added dropwise at the same temperature. After complete addition, the reaction mass is stirred for 4 hrs to ensure complete reaction. After completion of the reaction, the reaction mass is quenched with saturated solution of ammonium chloride. The reaction mass is diluted with solvent like ethyl acetate. The organic layer is separated, washed with brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to yield Methyl 3-(Benzoyl-methyl- amino)-2-fluorobenzoate. After purification, HPLC purity is found to be above 94%, Yield: above 85%. A flask equipped with condenser, thermometer pocket, thermometer, mechanical stirrer, is charged with Methyl 3-(Benzoyl-methyl-amino)-2-fluorobenzoate and solvent like Methanol. Base like Sodium hydroxide is dissolved in water and is added in a single lot. The reaction mass is stirred at 45-50oC for 7 hrs. After completion of the reaction, methanol is removed and the residue is diluted with water. The mass is acidified with Concentrated HCl till the pH is 5- 6 to give 3-(Benzoyl-methyl-amino)-2-fluoro-benzoic acid (B-5). The solid thus obtained is filtered and washed with water till the filtrate is neutral. The solid is dried till constant weight. HPLC purity is found to be above 98%, yield is found to be above 94 %. In one of the embodiments, wherein the process of preparation of Broflanilide (I), comprises: A flask (0.5 Lit) equipped with condenser, thermometer pocket, thermometer, mechanical stirrer, is charged with 3-(Benzoyl-methyl-amino)-2-fluoro-benzoic acid (B-5), solvent (EDC) followed by Carbonyl diimidazole (CDI) and additive such as Diazabicyclo[2.2.2]octane DABCO. The contents are stirred for complete dissolution to obtain homogeneous solution. Base like potassium carbonate is added in single lot and the resulting slurry is stirred for 30 minutes. 2-Bromo-4-(1,2,2,2-tetrafluoro-1-trifluoromethyl-ethyl)-6-trifluoromethyl- phenylamine (A-5) is dissolved in solvent (EDC) and is added in a single lot and the reaction mass is heated at 50-70oC for 4.5 hr to ensure complete reaction. The reaction mass is cooled to room temperature and slowly poured over ice-cold water. Additional EDC is added. The layers are separated. The organic layer is separated, washed with brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to yield Broflanilide (I). The product is purified using Isopropanol (IPA). After purification, HPLC purity is found to be above 98%, yield is found to be above 85 %. Although this invention has been disclosed in the context of certain preferred embodiments and examples, it will be understood by those skilled in the art that the present invention extends beyond the specifically disclosed embodiments to other alternative embodiments and / or uses of the invention and obvious modifications and equivalents thereof. Thus, from the foregoing description, it will be apparent to one of ordinary skill in the art that many changes and modifications can be made thereto without departing from the spirit or scope of the invention as set forth herein. It is to be understood that the present invention is susceptible to modifications, changes and adaptations by those skilled in the art. Such modifications, changes, adaptations are intended to be within the scope of the present invention.. EXAMPLES Although the content of the present invention is further specifically explained using examples, the present invention is not limited to the following examples as long as the gist of the present invention is not exceeded. The following examples are presented to further explain the invention with experimental conditions, which are purely illustrative and are not intended to limit the scope of the invention. Broflanilide of Formula (I), was synthesized by reducing 2-Nitrobenzotrifluoride (A-1), i.e., to obtain 2-(trifluoromethyl) aniline (A-2), i.e., the compound (A-2), on refluxing with hexafluoropropan-2-one trihydrate in the presence of catalyst including but not limited to p-TSA, HCl, solvent, obtains an intermediate 2-[4-amino- 3-(trifluoromethyl) phenyl]-1,1,1,3,3,3-hexafluoropropan-2-ol (A-3), i.e., the compound (A-3), on reaction with Diethylaminosulfur Trifluoride (DAST) using ethylene dichloride as a solvent, obtains a compound 4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-2- (trifluoromethyl) aniline (A-4), i.e., the compound (A-4), on bromination yields 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)- 6-(trifluoromethyl)aniline (A-5), i.e., On the other hand, reacting 2-Chlorobenzoic acid (B-1), i.e., with potassium fluoride in N,N-dimethylformamide, obtains 2-fluorobenzoic acid (B-2), which then undergone bromination in the presence of hydrogen bromide and hydrogen peroxide with or without radical initiator to obtain 3-bromo-2-fluorobenzoic acid (B-3), i.e., amination of (B-3), obtains 3-amino-2-fluorobenzoic acid (B-4), i.e., converting (B-4) to the corresponding ester and then reacting with benzoyl chloride in the presence of base followed by alkylation with methyl iodide, and ester hydrolysis obtained 3- (Benzoyl-methyl-amino)-2-fluorobenzoic acid (B-5), i.e., Finally, condensation of the intermediates (B-5) and (A-5), obtains a target compound, 3- (benzoylmethylamino)-N-[2-bromo-4-[1,2,2,2-tetrafluoro-1-(trifluoromethyl) ethyl]-6- (trifluoromethyl) phenyl]-2-fluorobenzamide i.e., Broflanilide of formula (I). Formula (I). The route of synthesis of Broflanilide of formula (I) as per the present invention is described by the following scheme Part A DAST, EDC, 0oC to RT, 4 hr Bromination Example 1: Preparation of 2-(Trifluoromethyl)aniline (A-2) In an autoclave reactor (2 Lit), 2-Nitrobenzotrifluoride (214.3 g) was charged followed by Methanol (750 mL). 5% Pd / C (5.85 g) was charged carefully to this mixture. The autoclave was closed and then flushed with Nitrogen gas 3-4 times. Nitrogen gas was removed by applying a slight vacuum and then filled with Hydrogen gas. The pressure of hydrogen gas applied was 5 Kg / cm2. Stirring was started and continued. Whenever, the pressure of hydrogen drops below 5 Kg / cm2, hydrogen gas was refilled to make up the pressure. After completion of the reaction, hydrogen gas was vented out very carefully in water container. The reaction mass was filtered through celite and washed with methanol (2 X 50 mL). Combined methanolic layer was concentrated under vacuum to furnish 2-(Trifluoromethyl)aniline. After purification, HPLC purity: 96.7 %, yield: 159.3 g, 90%. Example 2: Preparation of 2-(4-Amino-3-trifluoromethyl-phenyl)-1,1,1,3,3,3- hexafluoro-propan-2-ol (A-3) A-2A-3A four necked glass reactor (1 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, was charged with 2-(Trifluoromethyl)aniline (182.3 g), and p- toluenesulfonic acid (p-TSA) (19.1 g) followed by Xylene (550 mL). Hexafluoroacetone trihydrate (302.4 g) was added in 4 equal lots with 20 minutes gap between the two lots. After complete addition of hexafluoroacetone trihydrate, the reaction mass was stirred at room temperature for 30 mins and then refluxed for 6.5 Hrs. After 6.5 hrs, water (68 mL) was removed using Dean-Stark assembly. Then the solvent was removed under vacuum. The residue was dissolved in ethyl acetate and washed with saturated sodium bicarbonate, water, brine, dried over sodium sulphate and concentrated under vacuum to yield 2-(4-Amino-3- trifluoromethyl-phenyl)-1,1,1,3,3,3-hexafluoro-propan-2-ol. After purification, HPLC purity: 97.7%, Yield: 303 g, 85%. Example 3: Preparation of 4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-2- (trifluoromethyl)aniline (A-4) three necked round bottomed flask (0.5 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, was charged with 2-(4-Amino-3-trifluoromethyl-phenyl)-1,1,1,3,3,3-hexafluoro- propan-2-ol (47.4 g), followed by ethylene dichloride (EDC) (140 mL) and stirred. The reaction was conducted in well-ventilated fume hood under inert atmosphere. After complete dissolution, it was cooled to +10oC. Diethylaminosulfur trifluoride (DAST) (35.1 g) dissolved in EDC (20 mL) was added dropwise over 30 minutes. The reaction mass allowed to warm to room temperature on its own and stirred for 4 hr. The reaction mass slowly poured over ice- cold water. Organic layer was separated. Aqueous layer was washed with EDC (50 mL). The combined organic layer was washed with brine, dried over anhydrous sodium sulphate, filtered and concentrated under vacuum to furnish 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl-ethyl)-2- trifluoromethyl-phenylamine. After purification, HPLC purity: 96.7 %, Yield: 58.7 g, 87%. Example 4: Preparation of 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6- (trifluoromethyl)aniline (A-5) A-5Method A: NaClO, NaBr, HCl, TBAB (2.5 mol%), EDC, 0oC to rt Method B: NBS, EDC, 55-60oC Method C: HBr (48%), H2O2(50%), FeBr3(5 mol %), TBAB (2.5 mol%) EDC, 55-60oC Method A: A four necked glass reactor (2 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer was charged with 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl- ethyl)-2-trifluoromethyl-phenylamine (115.8 g), ethylene dichloride (EDC) (350 mL), Tetrabutyl ammonium bromide (TBAB) (2.75 g), (Sodium bromide (38.3 g), 10 % HCl (120 mL) and cooled to +5 to +10oC. Sodium hypochlorite (226.2 g, 12% aqueous solution) was added dropwise over 2.5 hr without allowing to rise the reaction mass temperature. After complete addition of sodium hypochlorite (NaClO), the reaction was stirred for another 2 hrs. The reaction mass was diluted with EDC (200 mL). Both the layers were separated. The organic layer was washed with sodium thiosulphate, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under vacuum to furnish 2-Bromo-4-(1,2,2,2-tetrafluoro-1- trifluoromethyl-ethyl)-6-trifluoromethyl-phenylamine. After purification, HPLC purity: 94.8%, Yield: 116 g, 85%. Method B: A four necked glass reactor (2 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer was charged with 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl-ethyl)-2- trifluoromethyl-phenylamine (247.4 g), ethylene dichloride (EDC) (750 mL) and stirred for complete dissolution. N-Bromo succinimide (NBS) (149.2 g) was added in a single lot and the reaction mass heated to 55-60o C. The reaction was maintained at this temperature for 8 hrs and then filtered to remove succinimide. The solid cake was washed with EDC (2 X 100 mL). The combined organic layer was washed with water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish 2-Bromo-4-(1,2,2,2- tetrafluoro-1-trifluoromethyl-ethyl)-6-trifluoromethyl-phenylamine. After purification, HPLC purity: 96.7%, Yield: 254 g, 87%. Method C: A four necked glass reactor (2 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer was charged with 4-(1,2,2,2-Tetrafluoro-1-trifluoromethyl-ethyl)-2- trifluoromethyl-phenylamine (257.9 g), ethylene dichloride (EDC) (750 mL), TBAB (6.13 g), Ferric bromide (5.6 g) and stirred for 20 mins for homogeneous reaction mass. The reaction mass was heated at 50-55oC. HBr (148.9 g, 48% aqueous solution), hydrogen peroxide (58.2 g, 50% aqueous solution) were added dropwise simultaneously at almost the same rate over 3.5 hr. The reaction was monitored by HPLC and TLC. After the complete addition, the reaction mass was maintained at the same temperature for 11 hrs and then cooled to room temperature. The organic layer was separated. Aqueous layer was washed with EDC 250 mL). The combined organic layer was washed with water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish 2-Bromo-4-(1,2,2,2- tetrafluoro-1-trifluoromethyl-ethyl)-6-trifluoromethyl-phenylamine. After purification, HPLC purity: 97.3%, Yield: 252 g, 83%. A four necked glass reactor (1 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer was charged with 2-Chlorobenzoic acid (170.1 g), ethylene dichloride (EDC) (450 mL), N,N-Dimethylformamide (4 g). The mixture was stirred for 20 mins. Thionyl chloride (134.6 g) was added dropwise at room temperature. After complete addition, the reaction mass was briefly refluxed for complete conversion of acid to the acid chloride. After complete conversion, ethylene chloride was distilled off. To the same reactor, N-Methyl-2-pyrrolidone (NMP) (200 mL) was added. Potassium fluoride (62.6 g) was added. The reaction mass heated to 145-150oC for 7.5 hrs. Then, the reaction mass was cooled to room temperature. The reaction mass was added dropwise under vigorous stirring to ice cold aqueous hydrochloric acid without allowing to rise the temperature beyond room temperature. The solid separated out and filtered. The solid was washed with ice-cold water till the filtrate was neutral to pH. The solid was dried till constant weight. HPLC purity: 96.5 %, 115.6 g, Yield:82%. Example 6: Preparation of 3-Bromo-2-fluorobenzoic acid (B-3) A four necked glass reactor (2 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer was charged with 2-fluorobenzoic acid (257.9 g), N,N-Dimethylformamide (DMF) (650 mL), The mixture was stirred for 20 mins and heated to 85-87oC. N-Bromo succinimide (NBS) (337 g) was added in 10 equal lots; each lot is separated by 20 minutes. After complete addition of NBS, the reaction was maintained at the same temperature for 7.5 hrs and then cooled to 70-75oC. DMF was distilled under reduced pressure. The residue was cooled to 40-45oC then diluted with ethylene dichloride (950 mL). Succinimide was filtered and the solid cake was washed with EDC (200 mL). The combined organic layer was washed with sodium thiosulphate aqueous solution, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish mixture of 3-Bromo-2- fluoro-benzoic acid (B-3) and 5-Bromo-2-fluoro-benzoic acid (B-3-I). The desired compound, 3-Bromo-2-fluoro-benzoic acid (B-3) by fractional crystallization. After purification, HPLC purity: 94.6%, Yield: 245 g, 65%. Example 7: Preparation of 3-Amino-2-fluorobenzoic acid (B-4) Amination Autoclave reactor (2 Lit) was charged with Ethylene dichloride (EDC) (300 mL) and 3-Bromo- 2-fluorobenzoic acid (144.3 g) followed by Tetrabutylammonium bromide (5.3 g). Ammonia (181.1 g, 30% aqueous solution) was charged under stirring. The reactor was closed and checked for no-leakages. The reaction mass was heated at 75-80oC for 9 hrs. The reaction progress was monitored by HPLC and TLC. After completion of the reaction, the reactor was cooled to room temperature. Ammonia gas if any was slowly released into water and the reactor was opened. The reaction mass was diluted with water and EDC and then transferred to separatory funnel to separate the layers. Both the layers were separated. Aqueous layer was washed with EDC. The combined organic layer was washed with sodium thiosulphate aqueous solution, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to furnish 3-Amino-2-fluorobenzoic acid (B-4). After purification, HPLC purity: 96.7%, Yield: 80.3 g, 81%. Example 8: Preparation of 3-(Benzoyl-methyl-amino)-2-fluorobenzoic acid (B-5) 4. NaOH, Water:MeOH (1:1) B-4 B-5 A four necked glass reactor (1 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, Calcium chloride guard tube was charged with methanol (200 mL) and compound B-4. Catalytic amount of N,N-Dimethylformamide (4 g) was added. The reaction mass was cooled to +10-20oC and thionyl chloride (158.6 g) was added dropwise under stirring. After complete addition of thionyl chloride, the reaction mass was brought to room temperature and then refluxed for 30 mins. After cooling, solvent and other volatiles were removed under reduced pressure to yield Methyl 3-Bromo-2-fluorobenzoate. Yield: 186.3 g, 96 %. Without any purification, the material was used for next step. A four necked glass reactor (1 Lit) fitted with condenser, thermometer pocket, thermometer, mechanical stirrer, Calcium chloride guard tube was charged with ethylene chloride (550 mL) and Methyl 3-Bromo-2-fluorobenzoate (186 g) thus obtained under stirring at room temperature. Triethyl amine (102 g) was charged in a single lot. Benzoyl chloride (158.5 g) was added dropwise and continuously while keeping the reaction mass temperature below 40oC. The reaction mass was stirred at room temperature for 2 hrs and then it was diluted with slow addition of ice-cold water. Both the layers were separated using separatory funnel. Aqueous layer was washed with EDC (100 mL). The combined organic layer was washed with sodium thiosulphate aqueous solution, water, brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to provide Methyl 3-Benzoylamino-2-fluoro- benzoate. After purification, HPLC purity: 95.4%, Yield: 256 g, 89%. A three necked RB flask equipped with condenser, thermometer pocket, thermometer, mechanical stirrer, was charged with dry Tetrahydrofuran (50 mL). The reactor was blanketed with nitrogen gas. Sodium hydride (13.8 g, 60% dispersion in oil) freed from the oil was added very carefully to the RB flask (0.5 Lit) containing the solvent. The suspension was stirred briefly. Methyl 3-Benzoylamino-2-fluoro-benzoate (91.5 g) dissolved in dry THF (150 mL) was added dropwise. Evolution of the gas was seen. After complete addition, the reaction mass was stirred briefly. Methyl iodide (50.2 g) was added dropwise at the same temperature. After complete addition, the reaction mass was stirred for 4 hrs to ensure complete reaction. After completion of the reaction, the reaction mass was quenched with saturated solution of ammonium chloride. The reaction mass was diluted with ethyl acetate (300 mL). The organic layer was separated, washed with brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to yield Methyl 3-(Benzoyl-methyl-amino)-2- fluorobenzoate. After purification, HPLC purity: 94.6%, Yield: 77.8 g, 86%. A three necked RB flask (0.5 Lit) equipped with condenser, thermometer pocket, thermometer, mechanical stirrer, was charged with Methyl 3-(Benzoyl-methyl-amino)-2-fluorobenzoate (76.6 g) and Methanol (120 mL). Sodium hydroxide (35 g) dissolved in water (120 mL) was added in a single lot. The reaction mass was tired at 45-50oC for 7 hrs. After completion of the reaction, methanol was removed and the residue was diluted with water (100 mL). The mass was acidified with Concentrated HCl till the pH is 5-6 to give 3-(Benzoyl-methyl-amino)-2- fluoro-benzoic acid (B-5). The solid thus obtained was filtered and washed with water till the filtrate is neutral. The solid was dried till constant weight. HPLC purity: 98.7%, yield: 65 g, 95 %. Example 9: Preparation of Broflanilide (I) A three necked RB flask (0.5 Lit) equipped with condenser, thermometer pocket, thermometer, mechanical stirrer, was charged with 3-(Benzoyl-methyl-amino)-2-fluoro-benzoic acid (B-5), EDC (200 mL), followed by Carbonyl diimidazole (CDI) (20 g) and for1,4- diazabicyclo[2.2.2]octane (DABCO) (2.1 g). The contents were stirred for complete dissolution to obtain homogeneous solution. Potassium carbonate (40 g) was added in single lot and the resulting slurry was stirred for 30 minutes. 2-bromo-4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline (A-5) (47.4 g) dissolved in EDC (100 mL) was added in a single lot and the reaction mass was heated at 50-70oC for 4.5 hr to ensure complete reaction. The reaction mass was cooled to room temperature and slowly poured over ice-cold water. Additional EDC (200 mL) was added. The layers were separated. The organic layer was separated, washed with brine, dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to yield Broflanilide (I). The product is purified using IPA. After purification, HPLC purity: 98.7%, yield: 62.9 g, 86 %. The present invention is more specifically explained by examples given above. However, it should be understood that the scope of the present invention is not limited by the examples in any manner. It will be appreciated by any person skilled in this art that the present invention includes the given examples and further can be modified and altered without departing from the novel teachings and advantages of the invention which are intended to be included within the scope of the invention.

Claims

WE CLAIM: Claim 1: An improved process for the preparation of Broflanilide of formula (I), which comprising: i. reacting a compound of formula (A-1), i.e., 2-Nitrobenzotrifluoride, by way of sequential reaction to obtain a compound of formula (A-5), i.e., 2-bromo-4- (1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6-(trifluoromethyl)aniline; ii. reacting a compound of formula (B-1), i.e., 2-Chlorobenzoic acid, by way of sequential reaction to obtain a compound of formula (B-5), i.e., 3-(Benzoyl-methyl- amino)-2-fluorobenzoic acid; iii. condensing the compound of formula (A-5) with compound of formula (B-5) in the presence of carbonyldiimidazole, a base, an additive and a solvent to obtain Broflanilide compound of formula (I). Claim 2: A process for preparation of 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6- (trifluoromethyl)aniline (compound A-5)) as claimed in claim 1, by the sequential reactions which comprises: i. reducing 2-Nitrobenzotrifluoride (compound of formula A-1) to obtain 2- (trifluoromethyl)aniline (compound of formula A-2); ii. reacting the compound of formula (A-2) obtained in step (i) with hexahaloacetone to obtain, 2-[4-amino-3-(trifluoromethyl)phenyl]-1,1,1,3,3,3-hexahalopropan-2-ol, i.e., compound with formula (A-3); iii. halogenating the compound (A-3) obtained in step (ii) in the presence of halogenating agents and suitable solvents to obtain 4-(1,1,1,2,3,3,3- heptafluoropropan-2-yl)-2-(trifluoromethyl)aniline , i.e., a compound of formula (A-4); iv. halogenating the compound (A-4) obtained in step (iii) in the presence of a halogenating agent combined with acetic acid, and / or H2O2 or combination thereof, to obtain 2-bromo-4-(1,1,1,2,3,3,3-heptafluoropropan-2-yl)-6-(trifluoromethyl) aniline, i.e., a compound of formula (A-5). Claim 3: A process for preparation of 3-(Benzoyl-methyl-amino)-2-fluorobenzoic acid compound of (B-5), by sequential reactions which comprises:i. fluorinating the compound 2-chlorobenzoic acid, i.e., compound (B-1) in the presence of fluorinating agents to obtain 2-Fluorobenzoic acid, a compound (B-2); ii. halogenating, the compound (B-2) obtained in step (i) in the presence of the halogenating agents to obtain a compound (B-3), i.e., 3-Bromo-2-fluorobenzoic acid; iii. aminating the compound (B-3) obtained in step (ii), in the presence of aminating agent to obtain a compound (B-4), i.e., 3-amino-2-fluorobenzoic acid, either neat or using suitable solvents. iv. converting the compound (B-4) obtained in step (iii) to the corresponding ester, followed by reaction with benzoyl chloride in the presence of suitable solvents followed by alkylation in the presence of an alkylating agent, a base and a suitable solvent followed by ester hydrolysis to obtain the intermediate (B-5), i.e., 3- (Benzoyl-methyl-amino)-2-fluorobenzoic acid. Claim 4: The improved process as claimed in claim 1, wherein the process of step (iii) is carried out in the presence of a base selected from the group comprising of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium hydride, Triethyl amine, trimethylamine, 1,8-Diazabicyclo(5.4.0)undec- 7-ene (DBU) or combination thereof. Claim 5: The improved process as claimed in claim 1, wherein the additive is selected from the group comprising of Diazabicyclo[2.2.2]octane (DABCO), Quinuclidine, 1,8- diazabicyclo[5.4.0]undec-7-ene(DBU), 7-Methyl-1,5,7-triazabicyclo(4.4.0)dec-5-ene (MTBD), 1,5,7-Triazabicyclo(4.4.0)dec-5-ene (TBD), or combinations thereof. Claim 6: The improved process as claimed in claim 1, wherein the solvent is selected from the group comprising of N,N-Dimethylformamide (DMF), N-Methyl-2-pyrrolidone (NMP) , N,N- Dimethylacetamide (DMAc), Methylisobutyl ketone (MIBK), ethylene dichloride (EDC), methylenedichloride (MDC), chlorobenzene, tetrahydrofuran (THF), toluene, Xylene, heptane, methanol, ethyl acetate, Isopropanol or combination thereof. Claim 7: The process as claimed in claim 2, wherein the process of reducing compound of formula A-1 is carried out at a temperature range of 0oC to 200oC for a period of 1 hour to 24 hours, at pressure ranging from 1-bar to 50 bar.Claim 8: The process as claimed in claim 2, wherein the process of reacting the compound of formula (A-2) is carried out at a temperature range of -10oC to 150oC for a period of 1 hour to 24 hours. Claim 9: The process as claimed in claim 2, wherein the hexahaloacetone is selected from the group of hexafluoroacetone, Hexafluoroacetone trihydrate, or combination thereof. Claim 10: The process as claimed in claim 2, wherein the process of reacting the compound of formula (A-2) is carried out at a pressure from an atmospheric pressure to 50 bar. Claim 11: The process as claimed in claim 2, wherein the halogenating agent for compound (A-3) is selected from the group comprising of bromine, chlorine, fluorine, iodine, hydrogen bromide (HBr), hydrogen chloride, potassium fluoride (KF), selectfluorTM, Diethylaminosulfur Trifluoride (DAST) or combinations thereof. Claim 12: The process as claimed in claim 3, wherein the fluorinating agent is selected from potassium fluoride (KF), selectfluorTM, Diethylaminosulfur Trifluoride (DAST) or combinations thereof. Claim 13: The process as claimed in claim 3, wherein the process of fluorinating the compound (B-1) is carried out at a temperature range of -10oC to 200oC for a period of 1 hour to 24 hours, and at pressure of atmospheric pressure to 50 bar. Claim 14: The process as claimed in claims 2-3, wherein the halogenating agents are further selected from the group comprising of chlorine, bromine, fluorine, iodine, N- Bromosuccinimide (NBS), N-Chlorosuccinimide (NCS), 1,3-Dibromo-5,5- dimethylhydantoin, Sodium bromide (NaBr), Thionyl chloride wherein, the halogenating agent is in combination with acetic acid, and / or hydrogen peroxide or combination thereof, with or without radical initiators. Claim 15: The process as claimed in claim 3, wherein the process of halogenation is carried out at a temperature range of 25oC to 200oC for a period of 1 hour to 24 hours. and at pressure of from atmospheric pressure to 50 bar. Claim 16: The process as claimed in claim 3, wherein the aminating agent is selected from the group comprising ammonia gas, aqueous ammonia, ammonium acetate, ammonium formate, or combinations thereof.Claim 17: The process as claimed in claim 3, wherein the process of aminating the compound (B-3) is carried out at atmospheric pressure or under pressure in autoclave using varying pressures from 1 bar to 50 bar and temperatures ranging from 25oC to 150oC. Claim 18: The process as claimed in claim 3, wherein the process of alkylation of step (iv) carried out in the presence of an alkylating agent selected from the group comprising dimethyl sulfate, dimethyl disulfide, methyl iodide, methyl chloride, methyl bromide, dialkyl sulfate, dialkyl disulfide, alkyl iodide, alkyl chloride, alkyl bromide or combination thereof. Claim 19: The process as claimed in claim 3, wherein the step (iv) is carried out in presence of base selected from the group comprising sodium hydroxide, potassium hydroxide, potassium carbonate, sodium carbonate, sodium bicarbonate, potassium bicarbonate, n-butyl lithium, sodium hydride, trimethylamine, Triethyl amine, 1,8-Diazabicyclo(5.4.0)undec-7-ene (DBU), or combination thereof.. Claim 20: The process as claimed in claims 2-3, wherein the solvent or suitable solvent is selected from the group comprising of N,N-Dimethylformamide (DMF), N-Methyl-2- pyrrolidone (NMP), N,N-Dimethylacetamide (DMAc), Methylisobutyl ketone (MIBK), , ethylene dichloride (EDC), methylenedichloride (MDC), chlorobenzene, tetrahydrofuran (THF), toluene, Xylene, heptane, methanol, water, ethyl acetate, methanol, Isopropanol or combination thereof. base Claim 21: The process as claimed in claim 14, wherein the free radical initiators are selected from the group comprising benzoyl peroxide, di-tert-butyl peroxide, azobisisobutyronitrile (AIBN), tert-Butyl hydroperoxide, or combinations thereof Claim 22: The process as claimed in claims 1-21, wherein the catalyst is selected from the group comprising 5-10% Pd on Charcoal or 5% Pt on Charcoal, ZSM-5, Cu(I) salts, trichloroisocyanuric acid (TCICA), Trifluoroacetic acid, Fe (III) salts, Aluminum chloride (AlCl3), Ferric bromide (FeBr3), Ferric chloride (FeCl3), N,N-Dimethylformamide (DMF), Azobisisobutyronitrile (AIBN), , p-toluenesulfonic acid (p-TSA), HCl, Tetrabutyl ammonium bromide (TBAB), or combination thereof Claim 23: The process as claimed in claims 1-22, wherein the process is carried out at a temperature range of from -10oC to 200oC to obtain a compound of formula (I).Claim 24: The process for the preparation of Broflanilide of Formula (I), as claimed in claims 1-23, wherein the Broflanilide of Formula (I) is obtained in free form or in agrochemically acceptable salt or in formulation form. Claim 25: A process for preparing an agrochemical composition comprising Broflanilide of Formula (I) as obtained by the process claimed in claims 1-23. Claim 26: An agrochemical composition, wherein the composition comprises at least a bio- active effective amount of Broflanilide of Formula (I) as obtained by the process claimed in claims 1-23. Claim 27: The agrochemical composition as claimed in claim 26, which further comprises one or more agrochemically acceptable excipients. Claim 28: A process for preparing the agrochemical composition comprising Broflanilide of Formula (I) as claimed in claims 26-27.

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