Herbicidal derivatives

Abstract

Compounds of Formula (I), wherein the substituents are as defined in claim 1. The invention further relates to herbicidal compositions which comprise a compound of Formula (I) and to the use of compounds of Formula (I) for controlling weeds, in particular in crops of useful plants.

Description

[0001]82965-FF 1 HERBICIDAL DERIVATIVES The present invention relates to herbicidal pyridone derivatives, e.g., as active ingredients, which have herbicidal activity. The invention also relates to agrochemical compositions which comprise at least one of the pyridone derivatives, to processes of preparation of these compounds and to uses of the pyridone derivatives or compositions in agriculture or horticulture for controlling weeds, in particular in crops of useful plants. EP0239391, EP0127313, EP0040082, GB2182931, GB2328614, WO2022117445, WO2022117446, and WO 2023 / 110664 describe pyridone derivatives as herbicidal agents. According to the present invention, there is provided a compound of Formula (I): wherein R1is C1-C6alkyl, C1-C6alkoxy, C2-C6alkenyl, C2-C6alkynyl, C1-C6alkoxyC1-C6alkyl, or C3- C6cycloalkyl; R2is phenyl or heteroaryl, wherein the heteroaryl moiety is a 5- or 6-membered aromatic ring which comprises 1, 2, 3 or 4 heteroatoms individually selected from N, O and S, and wherein each phenyl and heteroaryl moiety may be optionally substituted with 1, 2, 3, or 4 groups, which may be the same or different, represented by R5; R3is hydrogen or C1-C6alkyl; R4is hydrogen or halogen; R5is cyano, nitro, halogen, C1-C6alkyl, C1-C6alkoxy, C1-C6haloalkyl, C1-C6haloalkoxy, C1- C6alkoxyC1-C6alkyl, C1-C6alkylsulfanyl, C1-C6alkylsulfinyl, C1-C6alkylsulfonyl, C1-C6alkylsulfonamido, C1-C6alkylcarbonyl, C1-C6alkoxycarbonyl, C1-C6alkylaminocarbonyl, C3-C6cycloalkyl, C3- C6cycloalkylaminocarbonyl, or N,N-di(C1-C4alkyl)aminocarbonyl; and X is halogen; or a salt or an N-oxide thereof. A problem with many current herbicides used to control unwanted vegetation before planting a crop is that they can cause damage to the following crop if it is planted soon after the herbicide is used. 82965-FF 2 A herbicide that is safe to crops when applied before they emerge, whilst providing good control on already emerged weeds, is therefore a major advantage over current herbicides. Surprisingly, it has been found that the novel compounds of Formula (I) not only have, for practical purposes, a very advantageous level of herbicidal activity, but they also shown no or low levels of damage to several major agricultural crops, such as corn (zea mays), when applied pre-emergence whilst providing exceptional control of unwanted vegetation (weeds and volunteer crops) when applied post-emergence, thus enabling them to be used successfully shortly before planting a new crop. In contrast related compounds reported in the prior art, whilst showing similar control of unwanted vegetation, cause unacceptable damage to many crops thus preventing their use. Surprisingly, it has been found that the novel compounds of Formula (I) have, for practical purposes, a very advantageous level of herbicidal activity. According to a second aspect of the invention, there is provided an agrochemical composition comprising a herbicidally effective amount of a compound of Formula (I) according to the present invention. Such an agricultural composition may further comprise at least one additional active ingredient and / or an agrochemically-acceptable diluent or carrier. According to a third aspect of the invention, there is provided a method of controlling weeds at a locus comprising applying to the locus a weed controlling amount of a composition comprising a compound of Formula (I). According to a fourth aspect of the invention, there is provided the use of a compound of Formula (I) as a herbicide. Where substituents are indicated as being “optionally substituted”, this means that they may or may not carry one or more identical or different substituents, e.g., one, two or three R6substituents. For example, C1-C6alkyl substituted by 1, 2 or 3 halogens, may include, but not be limited to, -CH2Cl, -CHCl2, -CCl3, -CH2F, -CHF2, -CF3, -CH2CF3 or -CF2CH3 groups. As another example, C1-C6alkoxy substituted by 1, 2 or 3 halogens, may include, but not limited to, CH2ClO-, CHCl2O-, CCl3O-, CH2FO-, CHF2O-, CF3O-, CF3CH2O- or CH3CF2O- groups. As used herein, the term “cyano” means a -CN group. As used herein, the term "halogen" refers to fluorine (fluoro), chlorine (chloro), bromine (bromo) or iodine (iodo). As used herein, the term “nitro” means an -NO2 group. As used herein, the term “acetyl” means a -C(O)CH3group. As used herein, =O means an oxo group, e.g., as found in a carbonyl (-C(=O)-) group. As used herein, the term "C1-C6alkyl" refers to a straight or branched hydrocarbon chain radical consisting solely of carbon and hydrogen atoms, containing no unsaturation, having from one to six carbon atoms, and which is attached to the rest of the molecule by a single bond. “C1-C4alkyl” and “C1- 82965-FF 3 C3alkyl” are to be construed accordingly. Examples of C1-C6alkyl include, but are not limited to, methyl, ethyl, n-propyl, and the isomers thereof, for example, isopropyl. A “C1-C6alkylene” group refers to the corresponding definition of C1-C6alkyl, except that such radical is attached to the rest of the molecule by two single bonds. The term “C1-C2alkylene” is to be construed accordingly. Examples of C1-C6alkylene, include, but are not limited to, -CH2-, -CH2CH2- and -(CH2)3-. As used herein, the term “C1-C6haloalkyl” refers a C1-C6alkyl radical as generally defined above substituted by one or more of the same or different halogen atoms. The terms “C1-C4haloalkyl” and “C1- C3haloalkyl”, are to be construed accordingly. Examples of C1-C6haloalkyl include, but are not limited to trifluoromethyl. As used herein, the term "C1-C6alkoxy" refers to a radical of the formula -ORa where Ra is a C1- C6alkyl radical as generally defined above. The terms “C1-C4alkoxy” and “C1-C3alkoxy” are to be construed accordingly. Examples of C1-C6alkoxy include, but are not limited to, methoxy, ethoxy, 1- methylethoxy (iso-propoxy), and propoxy. As used herein, the term "C1-C6haloalkoxy" refers to a C1-C6alkoxy radical as generally defined above substituted by one or more of the same or different halogen atoms. The terms “C1-C4haloalkoxy” and “C1-C3haloalkoxy”, are to be construed accordingly. Examples of C1-C6haloalkoxy include, but are not limited to trifluoromethoxy. As used herein, the term "C2-C6alkenyl" refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one double bond that can be of either the (E)- or (Z)-configuration, having from two to six carbon atoms, which is attached to the rest of the molecule by a single bond. The term "C2-C3alkenyl" is to be construed accordingly. Examples of C2-C6alkenyl include, but are not limited to, ethenyl (vinyl), prop-1-enyl, prop-2-enyl (allyl), but-1-enyl. As used herein, the term "C2-C6alkynyl" refers to a straight or branched hydrocarbon chain radical group consisting solely of carbon and hydrogen atoms, containing at least one triple bond, having from two to six carbon atoms, and which is attached to the rest of the molecule by a single bond. The term "C2-C3alkynyl" is to be construed accordingly. Examples of C2-C6alkynyl include, but are not limited to, ethynyl, prop-1-ynyl, but-1-ynyl. As used herein, the term "C2-C6alkenyloxy" refers to a C2-C6alkenyl radical as generally defined above attached to the rest of the molecule through an oxygen atom. As used herein, the term "C2-C6alkynyloxy" refers to C2-C6alkynyl radical as generally defined above attached to the rest of the molecule through an oxygen atom. As used herein, the term “C1-C6alkoxyC1-C6alkyl” refers to a radical of the formula RbORa- wherein Rb is a C1-C6alkyl radical as generally defined above, and Ra is a C1-C6alkylene radical as generally defined above. The term “C1-C4alkoxyC1-C4alkyl” is to be construed accordingly. As used herein, the term “C1-C6alkoxyC1-C6alkoxy” refers to a radical of the formula RbORaO- wherein Ra and Rb are each independently a C1-C6alkyl radical as generally defined above. The terms “C1-C4alkoxyC1-C4alkoxy” and “C1-C3alkoxyC1-C3alkoxy” are to be construed accordingly. As used herein, the term “C3-C6cycloalkyl” refers to a radical which is a monocyclic saturated ring system which contains 3 to 6 carbon atoms. The terms "C3-C5cycloalkyl" and "C3-C4cycloalkyl" are to be construed accordingly. Examples of C3-C6cycloalkyl include, but are not limited to, cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl. 82965-FF 4 As used herein, the term “C3-C6cycloalkenyl” refers to a radical which is a monocyclic unsaturated ring system, containing at least one double bond, and which contains 3 to 6 carbon atoms. The terms "C3-C5cycloalkenyl" and "C3-C4cycloalkenyl" are to be construed accordingly. Examples of C3- C6cycloalkenyl include, but are not limited to, cyclopropenyl, cyclobutenyl, cyclopentenyl, and cyclohexenyl. As used herein, the term “C3-C6cycloalkylC1-C6alkyl” refers to a C3-C6cycloalkyl ring attached to the rest of the molecule by a C1-C6alkylene linker as defined above. Examples of C3-C6cycloalkylC1- C6alkyl include, but are not limited to, cyclopropylmethyl. As used herein, the term “C3-C6cycloalkylC1-C6alkoxy” refers to a C3-C6cycloalkyl ring attached to the rest of the molecule by a C1-C6alkoxy linker as defined above. Examples of C3-C6cycloalkylC1- C6alkoxy include, but are not limited to, cyclopropoxy. As used herein, the term “C3-C6cycloalkylaminocarbonyl” refers to a C3-C6cycloalkyl ring attached to the rest of the molecule through an -NHC(O)- linker. Examples of C3-C6cycloalkylaminocarbonyl include, but are not limited to, cyclopropylcarbamoyl (i.e., cyclopropylaminocarbonyl). As used herein, the term “C6-C10aryl” refers to a 6- to 10-membered aromatic ring system consisting solely of carbon and hydrogen atoms which may be mono-, bi- or tricyclic. Examples of such ring systems include phenyl, naphthalenyl, or indenyl. As used herein, the term "C6-C10arylC1-C3alkyl” refers to an aryl moiety as generally defined above, which is attached to the rest of the molecule by a C1-C3alkylene linker as defined above. As used herein, the term "phenoxy” refers to a phenyl ring attached to the rest of the molecule through an oxygen atom. As used herein, the term "benzyloxy” refers to a benzyl ring attached to the rest of the molecule through an oxygen atom. As used herein, the term "heterocyclyl" refers to a stable 4-, 5- or 6-membered non-aromatic monocyclic ring which comprises 1, 2 or 3 heteroatoms, wherein the heteroatoms are individually selected from nitrogen, oxygen, and sulfur. The heterocyclyl radical may be bonded to the rest of the molecule via a carbon atom or heteroatom. Examples of heterocyclyl include, but are not limited to, aziridinyl, azetidinyl, oxetanyl, thietanyl, tetrahydrofuryl, pyrrolidinyl, pyrazolidinyl, imidazolidnyl, piperidinyl, piperazinyl, morpholinyl, dioxolanyl, dithiolanyl and thiazolidinyl. As used herein, the term “heteroaryl” refers to a 5- or 6-membered aromatic monocyclic ring radical which comprises 1, 2, 3 or 4 heteroatoms individually selected from nitrogen, oxygen, and sulfur. Examples of heteroaryl include, but are not limited to, furanyl, pyrrolyl, thienyl, pyrazolyl, imidazolyl, thiazolyl, isothiazolyl, oxazolyl, isoxazolyl, triazolyl, tetrazolyl, pyrazinyl, pyridazinyl, pyrimidyl or pyridyl. As used herein, the term “C1-C6alkylcarbonyl” refers to a radical of the formula -C(O)Ra, where Ra is a C1-C6alkyl radical as generally defined above. Examples of C1-C6alkylcarbonyl include, but are not limited to, acetyl. As used herein, the term “C1-C6alkoxycarbonyl” refers to a radical of the formula -C(O)ORa, where Ra is a C1-C6alkyl radical as generally defined above. As used herein, the term “C1-C6alkylaminocarbonyl” refers to a radical of the formula -C(O)NHRa, wherein Ra is a C1-C6alkyl radical as generally defined above. Examples of C1-C6alkylaminocarbonyl include, but are not limited to, ethylcarbamoyl (i.e., ethylaminocarbonyl). 82965-FF 5 As used herein, the term “N,N-di(C1-C4alkyl)aminocarbonyl“ refers to a radical of the formula - C(O)N(Ra)(Rb), wherein Ra and Rb are each individually a C1-C4alkyl radical as generally defined above. The term “N,N-di(C1-C3alkyl)aminocarbonyl” is to be construed accordingly. Examples of N,N-di(C1- C4alkyl)aminocarbonyl include, but are not limited to, dimethylcarbamoyl (i.e. N, N- di(methyl)aminocarbonyl). As used herein, the term “N,N-di(C1-C4alkyl)aminosulfonyl“ refers to a radical of the formula - S(O)2N(Ra)(Rb), wherein Ra and Rb are each individually a C1-C4alkyl radical as generally defined above. The term “N,N-di(C1-C3alkyl)aminosulfonyl” is to be construed accordingly. Examples of N,N-di(C1- C4alkyl)aminosulfonyl include, but are not limited to, diethylsulfamoyl (i.e., N,N-di(methyl)aminosulfonyl). As used herein, the term “C1-C6alkylsulfanyl” refers to a radical of the formula -SRa, where Ra is a C1-C6alkyl radical as generally defined above. The terms “C1-C4alkylsulfanyl” and “C1-C3alkylsulfanyl”, are to be construed accordingly. Examples of C1-C6alkylsulfanyl include, but are not limited to methylsulfanyl. As used herein, the term “C1-C6alkylsulfinyl” refers to a radical of the formula -S(O)Ra, where Ra is a C1-C6alkyl radical as generally defined above. The terms “C1-C4alkylsulfinyl” and “C1-C3alkylsulfinyl”, are to be construed accordingly. Examples of C1-C6alkylsulfinyl include, but are not limited to methylsulfinyl. As used herein, the term “C1-C6alkylsulfonyl” refers to a radical of the formula -S(O)2Ra, where Ra is a C1-C6alkyl radical as generally defined above. The terms “C1-C4alkylsulfonyl” and “C1- C3alkylsulfonyl”, are to be construed accordingly. Examples of C1-C6alkylsolfanyl include, but are not limited to methylsulfonyl. As used herein, the term “C1-C6alkylsulfonamido” refers to a radical of the formula -NHS(O)2Ra, where Ra is a C1-C6alkyl radical as generally defined above. The presence of one or more possible stereogenic elements in a compound of formula (I) means that the compounds may occur in optically isomeric forms, i.e., enantiomeric or diastereomeric forms. Also, atropisomers may occur as a result of restricted rotation about a single bond. Formula (I) is intended to include all those possible isomeric forms and mixtures thereof. The present invention includes all those possible isomeric forms and mixtures thereof for a compound of formula (I). Likewise, formula (I) is intended to include all possible tautomers. The present invention includes all possible tautomeric forms for a compound of formula (I). In each case, the compounds of formula (I) according to the invention are in free form, in oxidized form as an N-oxide, or in salt form, e.g., an agronomically usable salt form. Salts that the compounds of Formula (I) may form with amines, including primary, secondary and tertiary amines (for example ammonia, dimethylamine and triethylamine), alkali metal and alkaline earth metal bases, transition metals or quaternary ammonium bases are preferred. In a particularly preferred set of embodiments, the compounds of Formula (I) may form chloride or 2,2,2-trifluoroacetate salts. N-oxides are oxidized forms of tertiary amines or oxidized forms of nitrogen-containing heteroaromatic compounds. They are described for instance in the book “Heterocyclic N-oxides” by A. Albini and S. Pietra, CRC Press, Boca Raton (1991). 82965-FF 6 The following list provides definitions, including preferred definitions, for substituents R1, R2, R3, R4, and R5, with reference to compounds of Formula (I). For any one of these substituents, any of the definitions given below may be combined with any definition of any other substituent given below or elsewhere in this document. R1is C1-C6alkyl, C1-C6alkoxy, C2-C6alkenyl, C2-C6alkynyl, C1-C6alkoxyC1-C6alkyl, or C3- C6cycloalkyl. Preferably, R1is C1-C4alkyl, C1-C4alkoxy, C2-C4alkenyl, C2-C4alkynyl, C1-C4alkoxyC1- C4alkyl, or C3-C6cycloalkyl. More preferably, R1is C1-C3alkyl, C1-C3alkoxy, C2-C3alkenyl, C2-C3alkynyl, C1-C3alkoxyC1-C3alkyl, or C3-C4cycloalkyl. More preferably still, R1is methyl, ethyl, n-propyl, methoxy, 2-methoxyethyl, ally, and prop-2-ynyl. In one set of embodiments, R1is C1-C3alkyl, preferably methyl or ethyl, and more preferably, ethyl. R2is phenyl or heteroaryl, wherein the heteroaryl moiety is a 5- or 6-membered aromatic ring which comprises 1, 2, 3 or 4 heteroatoms individually selected from N, O and S, and wherein each phenyl and heteroaryl moiety may be optionally substituted with 1, 2, 3, or 4 groups, which may be the same or different, represented by R5. Preferably, R2is phenyl or heteroaryl, wherein the heteroaryl moiety is a 5- or 6-membered aromatic ring which comprises 1, 2, or 3 heteroatoms individually selected from N, O and S, and wherein each phenyl and heteroaryl moiety may be optionally substituted with 1, 2, or 3 groups, which may be the same or different, represented by R5. More preferably, R2is phenyl or heteroaryl, wherein the heteroaryl moiety is a 5- or 6-membered aromatic ring which comprises 1 or 2 heteroatoms individually selected from N and O, and wherein each phenyl and heteroaryl moiety may be optionally substituted with 1, 2, or 3 groups, which may be the same or different, represented by R5. More preferably still, R2is phenyl or heteroaryl, wherein the heteroaryl moiety is a 5- or 6- membered aromatic ring which comprises 1 or 2 heteroatoms individually selected from N and O, and wherein each phenyl and heteroaryl moiety may be optionally substituted with 1 or 2 groups, which may be the same or different, represented by R5. Even more preferably still, R2is phenyl or pyridyl, wherein each phenyl and pyridyl moiety may be optionally substituted with 1 or 2 groups, which may be the same or different, represented by R5. In one set of embodiments, R2is phenyl optionally substituted with 1 or 2 groups, which may be the same or different, represented by R5. In another set of embodiments, R2is phenyl optionally substituted with 2 groups, which may be the same or different, represented by R5. In a further set of embodiments, R2is 3-chloro-4-cyanophenyl, 3,4-dichlorophenyl, or 3,4-difluorophenyl. In a more preferred set of embodiments, R2is 3-chloro-4-cyanophenyl or 3,4-dichlorophenyl. In a particularly preferred set of embodiments, R2is 3,4-dichlorophenyl. R3is hydrogen or C1-C6alkyl. Preferably, R3is hydrogen or C1-C4alkyl, more preferably, hydrogen or C1-C3alkyl. More preferably still, R3is hydrogen, methyl, or ethyl. Even more preferably, R3is hydrogen or ethyl. Even more preferably still, R3is hydrogen. 82965-FF 7 R4is hydrogen or halogen. Preferably, R4is hydrogen, chloro, fluoro, or bromo. More preferably, R4is hydrogen or bromo. In one set of embodiments, R4is hydrogen. R5is cyano, nitro, halogen, C1-C6alkyl, C1-C6alkoxy, C1-C6haloalkyl, C1-C6haloalkoxy, C1- C6alkoxyC1-C6alkyl, C1-C6alkylsulfanyl, C1-C6alkylsulfinyl, C1-C6alkylsulfonyl, C1-C6alkylsulfonamido, C1-C6alkylcarbonyl, C1-C6alkoxycarbonyl, C1-C6alkylaminocarbonyl, C3-C6cycloalkyl, C3- C6cycloalkylaminocarbonyl, or N,N-di(C1-C4alkyl)aminocarbonyl. Preferably, R5is cyano, nitro, halogen, C1-C4alkyl, C1-C4alkoxy, C1-C4haloalkyl, C1-C4haloalkoxy, C1-C4alkoxyC1-C3alkyl, C1-C4alkylsulfanyl, C1-C4alkylsulfinyl, C1-C4alkylsulfonyl, C1-C4alkylsulfonamido, C1-C4alkylcarbonyl, C1-C4alkoxycarbonyl, C1-C4alkylaminocarbonyl, C3-C6cycloalkyl, C3- C6cycloalkylaminocarbonyl, or N,N-di(C1-C3alkyl)aminocarbonyl. More preferably, R5is cyano, nitro, halogen, C1-C3alkyl, C1-C3alkoxy, C1-C3haloalkyl, C1- C3haloalkoxy, C1-C3alkoxyC1-C3alkyl, C1-C3alkylsulfanyl, C1-C3alkylsulfinyl, C1-C3alkylsulfonyl, C1- C3alkylsulfonamido, C1-C3alkylcarbonyl, C1-C3alkoxycarbonyl, C1-C3alkylaminocarbonyl, C3- C6cycloalkyl, C3-C6cycloalkylaminocarbonyl, or N,N-di(C1-C3alkyl)aminocarbonyl. More preferably still, R5is cyano, nitro, halogen, C1-C3alkyl, C1-C3alkoxy, C1-C3haloalkyl, C1- C3haloalkoxy, C1-C3alkoxyC1-C3alkyl, C1-C3alkylcarbonyl, or C3-C6cycloalkyl. Even more preferably, R5 is cyano, nitro, chloro, fluoro, methyl, isopropyl, methoxy, ethoxy, isopropoxy, trifluoromethyl, trifluoromethoxy, difluoromethoxy, 2,2-difluoroethoxy, methoxymethyl, acetyl, or cyclopropyl. In one set of embodiments, R5is cyano or halogen, preferably halogen, and more preferably R5is cyano or chloro, and more preferably still, R5is chloro. X is halogen. Preferably, X is chloro, fluoro, or iodo. More preferably, X is chloro or fluoro. Most preferably, X is chloro. In a compound of formula (I) according to the present invention, preferably: R1is C1-C3alkyl; R2is phenyl substituted with 2 groups, which may be the same or different, represented by R5; R3is C1-C3alkyl; R4is hydrogen or halogen; R5is cyano or halogen; and X is halogen. In another set of embodiments, R1is C1-C3alkyl; R2is 3-chloro-4-cyanophenyl or 3,4-dichlorophenyl; R3is hydrogen, methyl, or ethyl; R4is hydrogen or halogen; and X is halogen. In another set of embodiments, R1is C1-C3alkyl; R2is 3,4-dichlorophenyl; R3is hydrogen or ethyl; 82965-FF 8 R4is hydrogen; and X is chloro, fluoro, or iodo. In another set of embodiments, R1is ethyl; R2is 3-chloro-4-cyanophenyl or 3,4-dichlorophenyl; R3is hydrogen, methyl, or ethyl; R4is hydrogen or halogen; and X is halogen. In another set of embodiments, R1is ethyl; R2is 3-chloro-4-cyanophenyl or 3,4-dichlorophenyl; R3is hydrogen; R4is hydrogen; and X is chloro. In a preferable embodiment, the compound of Formula (I) is selected from 6-chloro-2-(3,4- dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylic acid (Compound 2), and 6-chloro-2-(4-chloro-3- cyano-phenyl)-1-ethyl-4-oxo-pyridine-3-carboxylic acid (Compound 6). Compounds of the invention can be made as shown in the following schemes, in which, unless otherwise stated, the definition of each variable is as defined above for a compound of Formula (I). General methods for the production of compounds of Formula (I) are described below. Unless otherwise stated in the text, R1, R2, R3, R4, and X are as defined hereinbefore. The starting materials used for the preparation of the compounds of the invention may be purchased from usual commercial suppliers or may be prepared by known methods. The starting materials as well as the intermediates may be purified before use in the next step by state of the art methodologies such as chromatography, crystallisation, distillation and filtration. Formula (A) Formula (I)A compound of Formula (I) wherein R3is hydrogen may be prepared by hydrolysis of a compound of Formula (A) where R3is C1-C6alkyl, with a suitable base (such as sodium hydroxide or lithium hydroxide), or with a suitable Bronsted acid (such as trifluoroacetic acid, hydrochloric acid, or sulfuric acid), or with a suitable Lewis acid (such as scandium triflate or zinc triflate) in a suitable solvent (such as dichloromethane, chloroform, ethyl acetate or tetrahydrofuran) with an optional co-solvent (such as 82965-FF 9 water). In the cases where a base is used, the product is obtained following acidification with a suitable acid (such as hydrochloric acid). Compounds of Formula (A) may additionally be prepared by methods described below. Scheme 2: A compound of Formula (B) wherein R3is C1-C6alkyl and X is chloride may be converted to a compound of Formula (A) wherein R3is C1-C6alkyl and X is bromide or fluoride by a halogen exchange reaction with a suitable halide source (such as trimethylsilyl bromide or tetramethylammonium;fluoride) in analogy to literature conditions. Typically, in a suitable solvent (such as dimethylformamide or dichloromethane) at elevated temperatures. This is shown above in Scheme 2. Scheme 3: Formula (C)Formula (B)A compound of Formula (C) wherein R3is C1-C6alkyl may be converted to a compound of Formula (B) wherein R3is C1-C6alkyl by a Sandmeyer halogenation with a suitable halogen source (such as copper (I) chloride) in analogy to literature conditions. Typically the reaction is performed by the reaction of a compound of Formula (C) in the presence of a suitable oxidant (such as sodium nitrite or isoamyl nitrite), with a suitable halogen source (such as copper (I) chloride) with a suitable acid (such as hydrogen chloride) in a suitable solvent (such as acetonitrile or dichloromethane) with an optional co-solvent (such as water) at elevated temperature. This is shown above in Scheme 3. 82965-FF 10 Scheme 4: Formula (D)Formula (C)A compound of Formula (D) wherein R3 is C1-C6alkyl may be converted to a compound of Formula (C) wherein R3 is C1-C6alkyl by the addition of a suitable base (such as sodium ethoxide) in a suitable solvent (such as ethanol). This is shown above in Scheme 4. Scheme 5: Formula (F)Formula (E)Formula (D) Compounds of Formula (D) may be prepared by reacting a compound of Formula (E) with a compound of Formula (F) in the presence of a solvent (such as acetic anhydride) with an optional co-solvent (such as acetonitrile) at elevated temperatures. This is shown above in Scheme 5. Compounds of Formula (F) and Formula (E) are commercially available, and may also be prepared by methods familiar to persons skilled in the art. Scheme 6: A compound of Formula (A) may be prepared by the decarboxylation and subsequent halogenation of compounds of Formula (G) with a halogenating agent (such as iodine) optionally in the presence of base (such as potassium phosphate) in a suitable solvent (such as dimethyl sulfoxide or acetonitrile) at elevated temperatures. This is shown above in Scheme 6. Other decarboxylative-halogenation conditions from the literature may also be used. 82965-FF 11 Scheme 7: Formula (H)Formula (G)A compound of Formula (G) may be prepared by the oxidation of compounds of Formula (H) where R is an aldehyde or alcohol, for example via a Pinnick oxidation, with a suitable oxidising agent (such as sodium chlorite) in the presence of base (such as monosodium phosphate) in a suitable solvent (such as tert-butanol or 2-methylbut-2-ene), and optionally in the presence of water. This is shown above in Scheme 7. Other oxidation conditions from the literature may also be used. Scheme 8: Compounds of Formula (i) where R is an aldehyde, alcohol or carboxylic acid may be prepared by treatment of compounds of Formula (J), with a suitable oxidising agent (such as 4-methyl-4-oxido- morpholin-4-ium), and optionally in the presence of base (such as N-ethyl-N-isopropyl-propan-2-amine) in a suitable solvent (such as acetonitrile). This is shown above in Scheme 8. Scheme 9: Compounds of Formula (J) may be prepared by reacting a compound of Formula (K), with a compound of Formula (E), optionally in the presence of a solvent (such as xylene), at an elevated temperature (for 82965-FF 12 example 140 °C). Compounds of Formula (E) and (K) are both commercially available, and also may be prepared by methods familiar to persons skilled in the art. This is shown above in Scheme 9. Scheme 10: Formula (L) Formula (M) Formula (E) Compounds of Formula (E) may be prepared from reaction of β-keto esters of Formula (M) with an amine salt. The amine salts can be prepared in situ by acidification of amines of Formula (L) with a suitable acid (such as acetic acid). These amine salts may be reacted with compounds of Formula (M) in a suitable solvent (such as toluene or tetrahydrofuran) in the presence of an acid (such as acetic acid) and a drying agent (such as 4Å molecular sieves). This is shown above in Scheme 10. Compounds of Formula (M) are commercially available and may also be prepared using conditions described below in Scheme 11. Compounds of Formula (L) are commercially available and may also be prepared by methods reported in the literature. Scheme 11: Formula (O) Formula (N) Formula (M) Compounds of Formula (M) may be prepared by treatment of carboxylic acids of Formula (O), wherein A is hydroxy or Cl, with an optional coupling agent (such as 1,1'-carbonyldiimidazole) in a suitable solvent (such as tetrahydrofuran) at ambient temperature. The intermediate can subsequently be reacted with compounds of Formula (N) (such as potassium 3-methoxy-3-oxopropanoate) in the presence of an inorganic salt (such as magnesium chloride) in a suitable solvent (such as tetrahydrofuran or acetonitrile) at elevated temperatures. This is shown above in Scheme 11. Compounds of Formula (O) and Formula (N) are commercially available or may be prepared by methods familiar to persons skilled in the art. The present invention still further provides a method of controlling weeds at a locus said method comprising application to the locus of a weed controlling amount of a composition comprising a compound of Formula (I). Moreover, the present invention may further provide a method of selectively controlling weeds at a locus comprising useful (crop) plants and weeds, wherein the method comprises application to the locus of a weed controlling amount of a composition according to the present invention. ‘Controlling’ means killing, reducing or retarding growth or preventing or reducing germination. It is noted 82965-FF 13 that the compounds of the present invention show a much improved selectivity compared to know, structurally similar compounds. Generally the plants to be controlled are unwanted plants (weeds). ‘Locus’ means the area in which the plants are growing or will grow. The application may be applied to the locus pre-emergence and / or postemergence of the crop plant. Some crop plants may be inherently tolerant to herbicidal effects of compounds of Formula (I). The rates of application of compounds of Formula (I) may vary within wide limits and depend on the nature of the soil, the method of application (pre- or post-emergence; seed dressing; application to the seed furrow; no tillage application etc.), the crop plant, the weed(s) to be controlled, the prevailing climatic conditions, and other factors governed by the method of application, the time of application and the target crop. The compounds of Formula (I) according to the invention are generally applied at a rate of from 10 to 2500 g / ha, especially from 25 to 1000 g / ha, more especially from 25 to 250 g / ha. The application is generally made by spraying the composition, typically by tractor mounted sprayer for large areas, but other methods such as dusting (for powders), drip or drench can also be used. The term "useful plants" is to be understood as also including useful plants that have been rendered tolerant to herbicides like bromoxynil or classes of herbicides such as, for example, 4- Hydroxyphenylpyruvate dioxygenase (HPPD) inhibitors, ALS inhibitors, for example primisulfuron, prosulfuron and trifloxysulfuron, 5-enol-pyrovyl-shikimate-3-phosphate-synthase (EPSPS) inhibitors, glutamine synthetase (GS) inhibitors or protoporphyrinogen-oxidase (PPO) inhibitors as a result of conventional methods of breeding or genetic engineering. An example of a crop that has been rendered tolerant to imidazolinones, e.g. imazamox, by conventional methods of breeding (mutagenesis) is Clearfield® summer rape (Canola). Examples of crops that have been rendered tolerant to herbicides or classes of herbicides by genetic engineering methods include glyphosate- and glufosinate-resistant maize varieties commercially available under the trade names RoundupReady®, Herculex I ^ and LibertyLink®. The term "useful plants" is to be understood as also including useful plants which have been so transformed by the use of recombinant DNA techniques that they are capable of synthesising one or more selectively acting toxins, such as are known, for example, from toxin-producing bacteria, especially those of the genus Bacillus. Examples of such plants are: YieldGard ^ (maize variety that expresses a CryIA(b) toxin); YieldGard Rootworm ^ (maize variety that expresses a CryIIIB(b1) toxin); YieldGard Plus ^ (maize variety that expresses a CryIA(b) and a CryIIIB(b1) toxin); Starlink ^ (maize variety that expresses a Cry9(c) toxin); Herculex I ^ (maize variety that expresses a CryIF(a2) toxin and the enzyme phosphinothricine N-acetyltransferase (PAT) to achieve tolerance to the herbicide glufosinate ammonium); NuCOTN 33B ^ (cotton variety that expresses a CryIA(c) toxin); Bollgard I ^ (cotton variety that expresses a CryIA(c) toxin); Bollgard II® (cotton variety that expresses a CryIA(c) and a CryIIA(b) toxin); VIPCOT ^ (cotton variety that expresses a VIP toxin); NewLeaf ^ (potato variety that expresses 82965-FF 14 a CryIIIA toxin); NatureGard ^ Agrisure® GT Advantage (GA21 glyphosate-tolerant trait), Agrisure® CB Advantage (Bt11 corn borer (CB) trait), Agrisure® RW (corn rootworm trait) and Protecta ^. Plant crops or seed material thereof can be both resistant to herbicides and, at the same time, resistant to insect feeding (“stacked” transgenic events). For example, seed can have the ability to express an insecticidal Cry3 protein while at the same time being tolerant to glyphosate. Crop plants are also to be understood to include those which are obtained by conventional methods of breeding or genetic engineering and contain so-called output traits (e.g. improved storage stability, higher nutritional value and improved flavour). The compounds of Formula (I) (or compositions comprising such) can be used to control unwanted plants (collectively, ‘weeds’). The weeds to be controlled may be both monocotyledonous species, for example Agrostis, Alopecurus, Avena, Brachiaria, Bromus, Cenchrus, Cyperus, Digitaria, Echinochloa, Eleusine, Lolium, Monochoria, Rottboellia, Sagittaria, Scirpus, Setaria and Sorghum, and dicotyledonous species, for example Abutilon, Amaranthus, Ambrosia, Chenopodium, Chrysanthemum, Conyza, Galium, Ipomoea, Nasturtium, Sida, Sinapis, Solanum, Stellaria, Veronica, Viola and Xanthium. Compounds of Formula (I) may be used in unmodified form or, preferably, together with the adjuvants conventionally employed in the art of formulation to provide herbicidal compositions, using formulation adjuvants, such as carriers, solvents and surface-active agents (SAA). The invention therefore further provides a herbicidal composition, comprising at least one compound Formula (I) and an agriculturally acceptable carrier and optionally an adjuvant. An agricultural acceptable carrier is for example a carrier that is suitable for agricultural use. Agricultural carriers are well known in the art. The herbicidal compositions generally comprise from 0.1 to 99 % by weight, especially from 0.1 to 95 % by weight, compounds of Formula I and from 1 to 99.9 % by weight of a formulation adjuvant which preferably includes from 0 to 25 % by weight of a surface-active substance. The compositions can be chosen from a number of formulation types. These include an emulsion concentrate (EC), a suspension concentrate (SC), a suspo-emulsion (SE), a capsule suspension (CS), a water dispersible granule (WG), an emulsifiable granule (EG), an emulsion, water in oil (EO), an emulsion, oil in water (EW), a micro-emulsion (ME), an oil dispersion (OD), an oil miscible flowable (OF), an oil miscible liquid (OL), a soluble concentrate (SL), an ultra-low volume suspension (SU), an ultra-low volume liquid (UL), a technical concentrate (TK), a dispersible concentrate (DC), a soluble powder (SP), a wettable powder (WP) and a soluble granule (SG). The formulation type chosen in any instance will depend upon the particular purpose envisaged and the physical, chemical and biological properties of the compound of Formula (I). Soluble powders (SP) may be prepared by mixing a compound of Formula (I) with one or more water-soluble inorganic salts (such as sodium bicarbonate, sodium carbonate or magnesium sulphate) or one or more water-soluble organic solids (such as a polysaccharide) and, optionally, one or more wetting agents, one or more dispersing agents or a mixture of said agents to improve water dispersibility / solubility. The mixture is then ground to a fine powder. Similar compositions may also be granulated to form water soluble granules (SG). Wettable powders (WP) may be prepared by mixing a compound of Formula (I) with one or more solid diluents or carriers, one or more wetting agents and, preferably, one or more dispersing agents 82965-FF 15 and, optionally, one or more suspending agents to facilitate the dispersion in liquids. The mixture is then ground to a fine powder. Similar compositions may also be granulated to form water dispersible granules (WG). Granules (GR) may be formed either by granulating a mixture of a compound of Formula (I) and one or more powdered solid diluents or carriers, or from pre-formed blank granules by absorbing a compound of Formula (I) (or a solution thereof, in a suitable agent) in a porous granular material (such as pumice, attapulgite clays, fuller's earth, kieselguhr, diatomaceous earths or ground corn cobs) or by adsorbing a compound of Formula (I) (or a solution thereof, in a suitable agent) on to a hard core material (such as sands, silicates, mineral carbonates, sulphates or phosphates) and drying if necessary. Agents which are commonly used to aid absorption or adsorption include solvents (such as aliphatic and aromatic petroleum solvents, alcohols, ethers, ketones and esters) and sticking agents (such as polyvinyl acetates, polyvinyl alcohols, dextrins, sugars and vegetable oils). One or more other additives may also be included in granules (for example an emulsifying agent, wetting agent or dispersing agent). Dispersible Concentrates (DC) may be prepared by dissolving a compound of Formula (I) in water or an organic solvent, such as a ketone, alcohol or glycol ether. These solutions may contain a surface active agent (for example to improve water dilution or prevent crystallisation in a spray tank). Emulsifiable concentrates (EC) or oil-in-water emulsions (EW) may be prepared by dissolving a compound of Formula (I) in an organic solvent (optionally containing one or more wetting agents, one or more emulsifying agents or a mixture of said agents). Suitable organic solvents for use in ECs include aromatic hydrocarbons (such as alkylbenzenes or alkylnaphthalenes, exemplified by SOLVESSO 100, SOLVESSO 150 and SOLVESSO 200; SOLVESSO is a Registered Trade Mark), ketones (such as cyclohexanone or methylcyclohexanone) and alcohols (such as benzyl alcohol, furfuryl alcohol or butanol), N-alkylpyrrolidones (such as N-methylpyrrolidone or N-octylpyrrolidone), dimethyl amides of fatty acids (such as C8-C10 fatty acid dimethylamide) and chlorinated hydrocarbons. An EC product may spontaneously emulsify on addition to water, to produce an emulsion with sufficient stability to allow spray application through appropriate equipment. Preparation of an EW involves obtaining a compound of Formula (I) either as a liquid (if it is not a liquid at room temperature, it may be melted at a reasonable temperature, typically below 70°C) or in solution (by dissolving it in an appropriate solvent) and then emulsifying the resultant liquid or solution into water containing one or more SAAs, under high shear, to produce an emulsion. Suitable solvents for use in EWs include vegetable oils, chlorinated hydrocarbons (such as chlorobenzenes), aromatic solvents (such as alkylbenzenes or alkylnaphthalenes) and other appropriate organic solvents which have a low solubility in water. Microemulsions (ME) may be prepared by mixing water with a blend of one or more solvents with one or more SAAs, to produce spontaneously a thermodynamically stable isotropic liquid formulation. A compound of Formula (I) is present initially in either the water or the solvent / SAA blend. Suitable solvents for use in MEs include those hereinbefore described for use in in ECs or in EWs. An ME may be either an oil-in-water or a water-in-oil system (which system is present may be determined by conductivity measurements) and may be suitable for mixing water-soluble and oil-soluble pesticides in the same formulation. An ME is suitable for dilution into water, either remaining as a microemulsion or forming a conventional oil-in-water emulsion. 82965-FF 16 Suspension concentrates (SC) may comprise aqueous or non-aqueous suspensions of finely divided insoluble solid particles of a compound of Formula (I). SCs may be prepared by ball or bead milling the solid compound of Formula (I) in a suitable medium, optionally with one or more dispersing agents, to produce a fine particle suspension of the compound. One or more wetting agents may be included in the composition and a suspending agent may be included to reduce the rate at which the particles settle. Alternatively, a compound of Formula (I) may be dry milled and added to water, containing agents hereinbefore described, to produce the desired end product. Aerosol formulations comprise a compound of Formula (I) and a suitable propellant (for example n-butane). A compound of Formula (I) may also be dissolved or dispersed in a suitable medium (for example water or a water miscible liquid, such as n-propanol) to provide compositions for use in non- pressurised, hand-actuated spray pumps. Capsule suspensions (CS) may be prepared in a manner similar to the preparation of EW formulations but with an additional polymerisation stage such that an aqueous dispersion of oil droplets is obtained, in which each oil droplet is encapsulated by a polymeric shell and contains a compound of Formula (I) and, optionally, a carrier or diluent therefor. The polymeric shell may be produced by either an interfacial polycondensation reaction or by a coacervation procedure. The compositions may provide for controlled release of the compound of Formula (I) and they may be used for seed treatment. A compound of Formula (I) may also be formulated in a biodegradable polymeric matrix to provide a slow, controlled release of the compound. The composition may include one or more additives to improve the biological performance of the composition, for example by improving wetting, retention or distribution on surfaces; resistance to rain on treated surfaces; or uptake or mobility of a compound of Formula (I). Such additives include surface active agents (SAAs), spray additives based on oils, for example certain mineral oils or natural plant oils (such as soy bean and rape seed oil), modified plant oils such as methylated rape seed oil (MRSO), and blends of these with other bio-enhancing adjuvants (ingredients which may aid or modify the action of a compound of Formula (I). Wetting agents, dispersing agents and emulsifying agents may be SAAs of the cationic, anionic, amphoteric or non-ionic type. Suitable SAAs of the cationic type include quaternary ammonium compounds (for example cetyltrimethyl ammonium bromide), imidazolines and amine salts. Suitable anionic SAAs include alkali metals salts of fatty acids, salts of aliphatic monoesters of sulphuric acid (for example sodium lauryl sulphate), salts of sulphonated aromatic compounds (for example sodium dodecylbenzenesulphonate, calcium dodecylbenzenesulphonate, butylnaphthalene sulphonate and mixtures of sodium di-isopropyl- and tri-isopropyl-naphthalene sulphonates), ether sulphates, alcohol ether sulphates (for example sodium laureth-3-sulphate), ether carboxylates (for example sodium laureth-3-carboxylate), phosphate esters (products from the reaction between one or more fatty alcohols and phosphoric acid (predominately mono-esters) or phosphorus pentoxide (predominately di-esters), for example the reaction between lauryl alcohol and tetraphosphoric acid; additionally these products may be ethoxylated), sulphosuccinamates, paraffin or olefine sulphonates, taurates, lignosulphonates and phosphates / sulphates of tristyrylphenols. Suitable SAAs of the amphoteric type include betaines, propionates and glycinates. 82965-FF 17 Suitable SAAs of the non-ionic type include condensation products of alkylene oxides, such as ethylene oxide, propylene oxide, butylene oxide or mixtures thereof, with fatty alcohols (such as oleyl alcohol or cetyl alcohol) or with alkylphenols (such as octylphenol, nonylphenol or octylcresol); partial esters derived from long chain fatty acids or hexitol anhydrides; condensation products of said partial esters with ethylene oxide; block polymers (comprising ethylene oxide and propylene oxide); alkanolamides; simple esters (for example fatty acid polyethylene glycol esters); amine oxides (for example lauryl dimethyl amine oxide); lecithins and sorbitans and esters thereof, alkyl polyglycosides and tristyrylphenols. Suitable suspending agents include hydrophilic colloids (such as polysaccharides, polyvinylpyrrolidone or sodium carboxymethylcellulose) and swelling clays (such as bentonite or attapulgite). The compounds of the present invention can also be used in mixture with one or more additional herbicides and / or plant growth regulators. Examples of such additional herbicides or plant growth regulators include acetochlor, acifluorfen (including acifluorfen-sodium), aclonifen, ametryn, amicarbazone, aminopyralid, aminotriazole, atrazine, beflubutamid-M, benquitrione, bensulfuron (including bensulfuron-methyl), bentazone, bicyclopyrone, bilanafos, bipyrazone, bispyribac-sodium, bixlozone, broclozone, bromacil, bromoxynil, butachlor, butafenacil, carfentrazone (including carfentrazone-ethyl), cloransulam (including cloransulam-methyl), chlorimuron (including chlorimuron- ethyl), chlorotoluron, chlorsulfuron, cinmethylin, clacyfos, clethodim, clodinafop (including clodinafop- propargyl), clomazone, clopyralid, cyclopyranil, cyclopyrimorate, cyclosulfamuron, cyhalofop (including cyhalofop-butyl), 2,4-D (including the choline salt and 2-ethylhexyl ester thereof), 2,4-DB, desmedipham, dicamba (including the aluminium, aminopropyl, bis-aminopropylmethyl, choline, dichloroprop, diglycolamine, dimethylamine, dimethylammonium, potassium and sodium salts thereof) diclosulam, diflufenican, diflufenzopyr, dimethachlor, dimethenamid-P, dioxopyritrione, diquat dibromide, diuron, epyrifenacil, ethalfluralin, ethofumesate, fenoxaprop (including fenoxaprop-P-ethyl), fenoxasulfone, fenpyrazone, fenquinotrione, fentrazamide, flazasulfuron, florasulam, florpyrauxifen (including florpyrauxifen-benzyl), fluazifop (including fluazifop-P-butyl), flucarbazone (including flucarbazone-sodium), fluchloraminopyr (including fluchloraminopyr-tefuryl), flufenacet, flufenoximacil, flumetsulam, flumioxazin, fluometuron, fomesafen flupyrsulfuron (including flupyrsulfuron-methyl- sodium), fluroxypyr (including fluroxypyr-meptyl), flusulfinam, fomesafen, foramsulfuron, glufosinate (including L-glufosinate and the ammonium salts of both), glyphosate (including the diammonium, isopropylammonium and potassium salts thereof), halauxifen (including halauxifen-methyl), haloxyfop (including haloxyfop-methyl), hexazinone, hydantocidin, icafolin (including icafolin-methyl), imazamox (including R-imazamox), imazapic, imazapyr, imazethapyr, indaziflam, indolauxipyr (including indolauxipyr-cyanomethyl), iodosulfuron (including iodosulfuron-methyl-sodium), iofensulfuron (including iofensulfuron-sodium), ioxynil, iptriazopyrid, isoproturon, isoxaflutole, lancotrione, MCPA, MCPB, mecoprop-P, mesosulfuron (including mesosulfuron-methyl), mesotrione, metamitron, metazachlor, methiozolin, metolachlor, metosulam, metribuzin, metsulfuron, napropamide, nicosulfuron, norflurazon, oxadiazon, oxasulfuron, oxyfluorfen, paraquat dichloride, pendimethalin, penoxsulam, phenmedipham, picloram, pinoxaden, pretilachlor, primisulfuron-methyl, prometryne, propanil, propaquizafop, propyrisulfuron, propyzamide, prosulfocarb, prosulfuron, pyraclonil, pyraflufen (including 82965-FF 18 pyraflufen-ethyl), pyraquinate, pyrasulfotole, pyridate, pyriftalid, pyriflubenzoxim, pyrimisulfan, pyroxasulfone, pyroxsulam, quinclorac, quinmerac, quizalofop (including quizalofop-P-ethyl and quizalofop-P-tefuryl), rimisoxafen, rimsulfuron, saflufenacil, sethoxydim, simazine, S-metalochlor, sulfentrazone, sulfosulfuron, tebuthiuron, tefuryltrione, tembotrione, terbuthylazine, terbutryn, tetflupyrolimet, thiencarbazone, thifensulfuron, tiafenacil, tolpyralate, topramezone, tralkoxydim, triafamone, triallate, triasulfuron, tribenuron (including tribenuron-methyl), triclopyr, trifloxysulfuron (including trifloxysulfuron-sodium), trifludimoxazin, trifluralin, triflusulfuron, tripyrasulfone, 3-(2-chloro-4- fluoro-5-(3-methyl-2,6-dioxo-4-trifluoromethyl-3,6-dihydropyrimidin-1(2H)-yl)phenyl)-5-methyl-4,5- dihydroisoxazole-5-carboxylic acid ethyl ester, 4-hydroxy-1-methoxy-5-methyl-3-[4-(trifluoromethyl)-2- pyridyl]imidazolidin-2-one, 4-hydroxy-1,5-dimethyl-3-[4-(trifluoromethyl)-2-pyridyl]imidazolidin-2-one, 5- ethoxy-4-hydroxy-1-methyl-3-[4-(trifluoromethyl)-2-pyridyl]imidazolidin-2-one, 4-hydroxy-1-methyl-3-[4- (trifluoromethyl)-2-pyridyl]imidazolidin-2-one, 4-hydroxy-1,5-dimethyl-3-[1-methyl-5- (trifluoromethyl)pyrazol-3-yl]imidazolidin-2-one, (4R)1-(5-tert-butylisoxazol-3-yl)-4-ethoxy-5-hydroxy-3- methyl-imidazolidin-2-one, (1RS,5SR)-3-[2-methoxy-4-(prop-1-yn-1-yl)phenyl]-4-oxobicyclo[3.2.1]oct- 2-en-2-yl methyl carbonate, ethyl-2-[[3-[[3-chloro-5-fluoro-6-[3-methyl-2,6-dioxo-4- (trifluoromethyl)pyrimidin-1-yl]-2-pyridyl]oxy]acetate, methyl 2-[2-[2-bromo-4-fluoro-5-[3-methyl-2,6- dioxo-4-(trifluoromethyl)pyrimidin-1-yl]phenoxy]phenoxy]-2-methoxy-acetate, 6-chloro-4-(2,7-dimethyl- 1-naphthyl)-5-hydroxy-2-methyl-pyridazin-3-one, (2-fluorophenyl)methyl 6-amino-5-chloro-2-(4-chloro- 2-fluoro-3-methoxy-phenyl)pyrimidine-4-carboxylate, 6-amino-5-chloro-2-(4-chloro-2-fluoro-3-methoxy- phenyl)pyrimidine-4-carboxylic acid, methyl 3-[2-chloro-5-[3,6-dihydro-3-methyl-2,6-dioxo-4- (trifluoromethyl)-1(2H)-pyrimidinyl]-4-fluorophenyl]-3a,4,5,6-tetrahydro-6-methyl-6aH- cyclopent[d]isoxazole-6a-carboxylate, 2-[(2-bromo-6-fluoro-phenyl)methoxy]-4-isopropyl-1-methyl-7- oxabicyclo[2.2.1]heptane and (isopropylideneamino) 6-amino-2-(4-chloro-2-fluoro-3-methoxy-phenyl)- 5-methoxy-pyrimidine-4-carboxylate. The mixing partners of the compound of Formula (I) may also be in the form of esters or salts, as mentioned e.g. in The Pesticide Manual, Sixteenth Edition, British Crop Protection Council, 2012. The mixing ratio of the compound of Formula (I) to the mixing partner is preferably from 1: 100 to 1000:1. The mixtures can advantageously be used in the above-mentioned formulations (in which case "active ingredient" relates to the respective mixture of compound of Formula (I) with the mixing partner). The compounds or mixtures of the present invention can also be used in combination with one or more herbicide safeners. Examples of such safeners include benoxacor, cloquintocet (including cloquintocet-mexyl), cyprosulfamide, dichlormid, fenchlorazole (including fenchlorazole-ethyl), fenclorim, fluxofenim, furilazole, isoxadifen (including isoxadifen-ethyl), mefenpyr (including mefenpyr- diethyl), metcamifen and oxabetrinil. Particularly preferred are mixtures of a compound of Formula (I) with cyprosulfamide, isoxadifen-ethyl, cloquintocet-mexyl and / or metcamifen. The safeners of the compound of Formula (I) may also be in the form of esters or salts, as mentioned e.g. in The Pesticide Manual, 16thEdition (BCPC), 2012. The reference to cloquintocet-mexyl also applies to a lithium, sodium, potassium, calcium, magnesium, aluminium, iron, ammonium, quaternary ammonium, sulfonium or phosphonium salt thereof as disclosed in WO 02 / 34048. Preferably the mixing ratio of compound of Formula (I) to safener is from 100:1 to 1:10, especially from 20:1 to 1:1. 82965-FF 19 The compounds of Formula (I) are normally used in the form of agrochemical compositions and can be applied to the crop area or plant to be treated, simultaneously or in succession with further compounds. These further compounds can be e.g. fertilizers or micronutrient donors or other preparations, which influence the growth of plants. They can also be selective herbicides or non- selective herbicides as well as insecticides, fungicides, bactericides, nematicides, molluscicides or mixtures of several of these preparations, if desired together with further carriers, surfactants or application promoting adjuvants customarily employed in the art of formulation. The term “locus” as used herein means fields in or on which plants are growing, or where seeds of cultivated plants are sown, or where seed will be placed into the soil. It includes soil, seeds, and seedlings, as well as established vegetation. The term “plants” refers to all physical parts of a plant, including seeds, seedlings, saplings, roots, tubers, stems, stalks, foliage, and fruits. The term “plant propagation material” is understood to denote generative parts of the plant, such as seeds, which can be used for the multiplication of the latter, and vegetative material, such as cuttings or tubers, for example potatoes. There may be mentioned for example seeds (in the strict sense), roots, fruits, tubers, bulbs, rhizomes and parts of plants. Germinated plants and young plants which are to be transplanted after germination or after emergence from the soil, may also be mentioned. These young plants may be protected before transplantation by a total or partial treatment by immersion. Preferably “plant propagation material” is understood to denote seeds. Pesticidal agents referred to herein using their common name are known, for example, from "The Pesticide Manual", 15th Ed., British Crop Protection Council 2009. The compounds of formula (I) may be used in unmodified form or, preferably, together with the adjuvants conventionally employed in the art of formulation. To this end, they may be conveniently formulated in known manner to emulsifiable concentrates, coatable pastes, directly sprayable or dilutable solutions or suspensions, dilute emulsions, wettable powders, soluble powders, dusts, granulates, and also encapsulations e.g. in polymeric substances. As with the type of the compositions, the methods of application, such as spraying, atomising, dusting, scattering, coating or pouring, are chosen in accordance with the intended objectives and the prevailing circumstances. The compositions may also contain further adjuvants such as stabilizers, antifoams, viscosity regulators, binders or tackifiers as well as fertilizers, micronutrient donors or other formulations for obtaining special effects. Suitable carriers and adjuvants, e.g., for agricultural use, can be solid or liquid and are substances useful in formulation technology, e.g. natural or regenerated mineral substances, solvents, dispersants, wetting agents, tackifiers, thickeners, binders or fertilizers. Such carriers are for example described in WO 97 / 33890. The compounds of Formula (I) are normally used in the form of compositions and can be applied to the crop area or plant to be treated, simultaneously or in succession with further compounds. These further compounds can be, e.g., fertilizers or micronutrient donors or other preparations, which influence the growth of plants. They can also be selective herbicides or non-selective herbicides as well as insecticides, fungicides, bactericides, nematicides, molluscicides or mixtures of several of these preparations, if desired together with further carriers, surfactants or application promoting adjuvants customarily employed in the art of formulation. 82965-FF 20 The compound of Formula (I) may be the sole active ingredient of a composition or it may be admixed with one or more additional active ingredients such as a pesticide, fungicide, synergist, herbicide or plant growth regulator where appropriate. An additional active ingredient may, in some cases, result in unexpected synergistic activities. In general, the formulations include from 0.01 to 90% by weight of active agent, from 0 to 20% agriculturally acceptable surfactant and 10 to 99.99% solid or liquid formulation inerts and adjuvant(s), the active agent consisting of at least the compound of formula (I) together with component (B) and (C), and optionally other active agents, particularly microbiocides or conservatives or the like. Concentrated forms of compositions generally contain in between about 2 and 80%, preferably between about 5 and 70% by weight of active agent. Application forms of formulation may for example contain from 0.01 to 20% by weight, preferably from 0.01 to 5% by weight of active agent. Whereas commercial products will preferably be formulated as concentrates, the end user will normally employ diluted formulations. The tables below illustrate examples of individual compounds of Formula (I) according to the invention: Table 1: Individual compounds of Formula (I) according to the invention Cpd No. R2Cpd No. R2001 phenyl 014 5-chloro-2-fluorophenyl 002 2-chlorophenyl 015 3-fluoro-4-cyanophenyl 003 3-chlorophenyl 016 3-chloro-4-cyanophenyl 004 4-chlorophenyl 017 3-fluoro-4-methylphenyl 005 2,4-dichlorophenyl 018 3-chloro-4-methylphenyl 006 3,4-dichlorophenyl 019 3-methyl-4-fluorophenyl 007 3,5-dichlorophenyl 020 3-methyl-4-chlorophenyl 008 2-fluorophenyl 021 3-methoxy-4-chlorophenyl 009 4-fluorophenyl 022 4-methoxy-3-chlorophenyl 010 3,4-difluorophenyl 023 3,5-difluoro-4-chlorophenyl 011 3-chloro-4-fluorophenyl 024 3,5-difluoro-4-cyanophenyl 012 4-chloro-3-fluorophenyl 025 3,5-dichoro-4-cyanophenyl 013 4-chloro-2-fluorophenyl 026 3-chloro-4-cyano-5-fluorophenyl 82965-FF 21 Table A-1 provides 26 compounds A-1.001 to A.1.026 of Formula (I) wherein R1is ethyl, X is chloro, R3and R4are both hydrogen, and R2is defined in Table 1. Table A-2 provides 26 compounds A-2.001 to A.2.026 of Formula (I) wherein R1is ethyl, X is bromo, R3and R4are both hydrogen, and R2is defined in Table 1. Table A-3 provides 26 compounds A-3.001 to A.3.026 of Formula (I) wherein R1is ethyl, X is chloro, R3is hydrogen, R4is bromo, and R2is defined in Table 1. Table A-4 provides 26 compounds A-4.001 to A.4.026 of Formula (I) wherein R1is ethyl, X is chloro, R3is ethyl, R4is hydrogen, and R2is defined in Table 1. Table A-5 provides 26 compounds A-5.001 to A.5.026 of Formula (I) wherein R1is ethyl, X is chloro, R3is methyl, R4is hydrogen, and R2is defined in Table 1. Formulation Examples Wettable powders a) b) c) active ingredient [compound of formula (I)] 25 % 50 % 75 % sodium lignosulfonate 5 % 5 % - sodium lauryl sulfate 3 % - 5 % sodium diisobutylnaphthalenesulfonate - 6 % 10 % phenol polyethylene glycol ether - 2 % - (7-8 mol of ethylene oxide) highly dispersed silicic acid 5 % 10 % 10 % Kaolin 62 % 27 % - The active ingredient is thoroughly mixed with the adjuvants and the mixture is thoroughly ground in a suitable mill, affording wettable powders that can be diluted with water to give suspensions of the desired concentration. Powders for dry seed treatment a) b) c) active ingredient [compound of formula (I)] 25 % 50 % 75 % light mineral oil 5 % 5 % 5 % highly dispersed silicic acid 5 % 5 % - Kaolin 65 % 40 % - Talcum - 20 % The active ingredient is thoroughly mixed with the adjuvants and the mixture is thoroughly ground in a suitable mill, affording powders that can be used directly for seed treatment. 82965-FF 22 Emulsifiable concentrate active ingredient [compound of formula (I)] 10 % octylphenol polyethylene glycol ether 3 % (4-5 mol of ethylene oxide) calcium dodecylbenzenesulfonate 3 % castor oil polyglycol ether (35 mol of ethylene oxide) 4 % Cyclohexanone 30 % xylene mixture 50 % Emulsions of any required dilution, which can be used in plant protection, can be obtained from this concentrate by dilution with water. Dusts a) b) c) Active ingredient [compound of formula (I)] 5 % 6 % 4 % talcum 95 % - - Kaolin - 94 % - mineral filler - - 96 % Ready-for-use dusts are obtained by mixing the active ingredient with the carrier and grinding the mixture in a suitable mill. Such powders can also be used for dry dressings for seed. Extruder granules Active ingredient [compound of formula (I)] 15 % sodium lignosulfonate 2 % carboxymethylcellulose 1 % Kaolin 82 % The active ingredient is mixed and ground with the adjuvants, and the mixture is moistened with water. The mixture is extruded and then dried in a stream of air. Coated granules Active ingredient [compound of formula (I)] 8 % polyethylene glycol (mol. wt.200) 3 % Kaolin 89 % The finely ground active ingredient is uniformly applied, in a mixer, to the kaolin moistened with polyethylene glycol. Non-dusty coated granules are obtained in this manner. Suspension concentrate active ingredient [compound of formula (I)] 40 % propylene glycol 10 % 82965-FF 23 nonylphenol polyethylene glycol ether (15 mol of ethylene oxide) 6 % Sodium lignosulfonate 10 % carboxymethylcellulose 1 % silicone oil (in the form of a 75 % emulsion in water) 1 % Water 32 % The finely ground active ingredient is intimately mixed with the adjuvants, giving a suspension concentrate from which suspensions of any desired dilution can be obtained by dilution with water. Using such dilutions, living plants as well as plant propagation material can be treated and protected against infestation by microorganisms, by spraying, pouring or immersion. Flowable concentrate for seed treatment active ingredient [compound of formula (I)] 40 % propylene glycol 5 % copolymer butanol PO / EO 2 % tristyrenephenole with 10-20 moles EO 2 % 1,2-benzisothiazolin-3-one (in the form of a 20% solution in water) 0.5 % monoazo-pigment calcium salt 5 % Silicone oil (in the form of a 75 % emulsion in water) 0.2 % Water 45.3 % The finely ground active ingredient is intimately mixed with the adjuvants, giving a suspension concentrate from which suspensions of any desired dilution can be obtained by dilution with water. Using such dilutions, living plants as well as plant propagation material can be treated and protected against infestation by microorganisms, by spraying, pouring or immersion. Slow Release Capsule Suspension 28 parts of a combination of the compound of formula (I) are mixed with 2 parts of an aromatic solvent and 7 parts of toluene diisocyanate / polymethylene-polyphenylisocyanate-mixture (8:1). This mixture is emulsified in a mixture of 1.2 parts of polyvinyl alcohol, 0.05 parts of a defoamer and 51.6 parts of water until the desired particle size is achieved. To this emulsion a mixture of 2.8 parts 1,6-diaminohexane in 5.3 parts of water is added. The mixture is agitated until the polymerization reaction is completed. The obtained capsule suspension is stabilized by adding 0.25 parts of a thickener and 3 parts of a dispersing agent. The capsule suspension formulation contains 28% of the active ingredients. The medium capsule diameter is 8-15 microns. The resulting formulation is applied to seeds as an aqueous suspension in an apparatus suitable for that purpose. Examples The following non-limiting examples provide specific synthesis methods for representative compounds of the present invention, as referred to in Table 2 below. 82965-FF 24 Throughout this description, temperatures are given in degrees Celsius (°C) and “m.p.” means melting point. List of Abbreviations °C = degrees Celsius, d = doublet, dd = doublet of doublets, DMSO = dimethyl sulfoxide, M = molar, m = multiplet, MHz = megahertz, q = quartet, qd = quartet of doublets, s = singlet, t = triplet. Example 1: Synthesis of ethyl 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3- carboxylate (Compound 1) Step 1: Synthesis of ethyl 3-(3,4-dichlorophenyl)-3-oxo-propanoate To a stirring solution of 1-(3,4-dichlorophenyl)ethanone (5.00 g, 26.5 mmol) and dimethyl carbonate (40 mL, 466 mmol) under nitrogen and at 0 °C was added portion-wise sodium hydride (3.17 g, 80 mmol, 60 mass%). The reaction mixture was allowed to warm to room temperature and stirred for 16 hours. Overnight the reaction mixture became a solid paste which was not possible to stir. More dimethyl carbonate (10 mL) was added in an attempt to create a mobile slurry for quenching. The reaction mixture was cooled to 0 °C and quenched by addition of water (25 mL). The reaction mixture was acidified to pH3 by addition of 2M aqueous hydrochloric acid and then extracted into ethyl acetate. The organic extract was dried over magnesium sulfate, filtered and evaporated to dryness under reduced pressure. The crude residue was purified by flash chromatography on silica gel to give ethyl 3-(3,4- dichlorophenyl)-3-oxo-propanoate (mixture of tautomers) as a colourless liquid. Enol:1H NMR (400 MHz, chloroform) δ = 12.47 (s, 1H), 7.87 (d, 1H), 7.59 (m, 3H), 7.49 (d, 1H), 5.65 (s, 1H), 3.82 (s, 3H). Keto:1H NMR (400 MHz, chloroform) δ = 8.03 (d, 1H), 7.77 (m, 1H), 7.58 (d, 2H), 3.97 (s, 2H), 3.76 (s, 3H). Step 2: Synthesis of ethyl (Z)-3-(3,4-dichlorophenyl)-3-(ethylamino)prop-2-enoate To a stirring solution of ethyl 3-(3,4-dichlorophenyl)-3-oxo-propanoate (1.65 g, 6.32 mmol) in toluene (11 mL) was added ethylammonium;acetate (19.0 mmol) and acetic acid (6.32 mmol). The orange 82965-FF 25 reaction mixture was heated at reflux for 6 hours. The cooled reaction mixture was diluted with ethyl acetate and was washed with saturated aqueous sodium bicarbonate solution. The phases were separated and the aqueous phase was extracted into ethyl acetate (x3). The organic extract was dried over magnesium sulfate and evaporated to dryness under reduced pressure. The crude residue was purified by flash chromatography on silica gel to give ethyl (Z)-3-(3,4-dichlorophenyl)-3- (ethylamino)prop-2-enoate as a colourless oil.1H NMR (400 MHz, chloroform) δ = 7.49 - 7.43 (m, 2H), 7.23 - 7.15 (m, 1H), 4.58 - 4.50 (m, 1H), 4.17 - 4.08 (m, 2H), 3.12 - 2.91 (m, 2H), 1.31 - 1.22 (m, 3H), 1.15 - 1.06 (m, 3H). Step 3: Synthesis of ethyl (2E)-4-cyano-2-[(3,4-dichlorophenyl)-(ethylamino)methylene]-3-oxo- butanoate A solution of ethyl (Z)-3-(3,4-dichlorophenyl)-3-(ethylamino)prop-2-enoate (5.10 g, 17.7 mmol) and 2- cyanoacetic acid (1.51 g, 17.7 mmol) in acetic anhydride (16 mL) was heated with stirring at 105 ºC for 0.25 hours. The cooled reaction mixture was evaporated to dryness under reduced pressure. To the residue was added water (20 mL). The resultant precipitated solid was collected by filtration and purified by flash chromatography on silica gel to give ethyl (2E)-4-cyano-2-[(3,4-dichlorophenyl)- (ethylamino)methylene]-3-oxo-butanoate as an off white solid. Step 4: Synthesis of ethyl 6-amino-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate To a stirring solution of ethyl (2E)-4-cyano-2-[(3,4-dichlorophenyl)-(ethylamino)methylene]-3-oxo- butanoate (4.50 g, 12.67 mmol) in ethanol (80 mL) at 0 ºC was added sodium ethoxide (4.11 g, 12.7 mmol). The reaction mixture was heated at 50 ºC for 2 hours. The cooled reaction mixture was poured into saturated aqueous ammonium chloride solution and extracted into dichloromethane. The combined organic extracts were dried over anhydrous magnesium sulfate, filtered and evaporated to dryness under reduced pressure. The crude residue was purified by flash chromatography on C-18 silica gel to give ethyl 6-amino-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate as a white solid.1H NMR (400 MHz, methanol) δ = 7.78 - 7.63 (m, 2H), 7.44 - 7.33 (m, 1H), 5.89 - 5.80 (m, 1H), 4.04 - 3.90 (m, 2H), 3.74 (q, 2H), 1.21 - 1.13 (m, 3H), 0.98 - 0.90 (m, 3H). 82965-FF 26 Step 5: Synthesis of ethyl 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate To a suspension of ethyl 6-amino-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate (0.500 g, 1.41 mmol) in a mixture of acetonitrile (12 mL) and aqueous hydrogen chloride solution (2M, 1.8 mL) was added copper (I) chloride (0.167 g, 1.69 mmol). The resultant reaction mixture was heated to 75 ºC after which a solution of sodium nitrite (0.126 g, 1.83 mmol) water (1 mL) was added dropwise. The reaction mixture was heated with stirring at 75 ºC for 0.25 hours. The cooled reaction mixture was poured into saturated aqueous ammonium chloride solution (30 mL) and extracted into ethyl acetate (2 x 50 mL). The combined organic extracts were dried over anhydrous magnesium sulfate, filtered and evaporated to dryness under reduced pressure. The crude residue was purified by flash chromatography on C-18 silica gel to give ethyl 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate as a yellow solid.1H NMR (400 MHz, methanol) δ = 7.77 (d, 1H), 7.75 (d, 1H), 7.46 (dd, 1H), 6.74 (s, 1H), 4.12 - 3.95 (m, 4H), 1.25 (t, 3H), 0.97 (t, 3H). Example 2: Synthesis of 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylic acid (Compound 2) A mixture of ethyl 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate (0.200 g, 0.53 mmol) and tris(trifluoromethylsulfonyloxy)scandium (0.276 g, 0.56 mmol) in water (2 mL) and tetrahydrofuran (2 mL) was heated under microwave irradiation at 120 ºC for 0.5 hours. The cooled reaction mixture was diluted with water and extracted into ethyl acetate. The combined organic extracts were dried over anhydrous magnesium sulfate, filtered and evaporated to dryness under reduced pressure to give 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylic acid.1H NMR (400MHz, chloroform) δ = 7.62 (d, 1H), 7.38 (s, 1H), 7.14 (br d, 1H), 7.09 - 6.99 (s, 1H), 4.06 (m, 2H), 1.30 - 1.24 (m, 3H). Example 3: Synthesis of ethyl 2-(3,4-dichlorophenyl)-1-ethyl-6-iodo-4-oxo-pyridine-3- carboxylate (Compound 3) 82965-FF 27 Step 1: Synthesis of 6-(bromomethyl)-2,2-dimethyl-1,3-dioxin-4-one A stirring solution of 2,2,6-trimethyl-1,3-dioxin-4-one (4.88 g, 34.3 mmol) and N-bromosuccinimide (7.94 g, 44.6 mmol) in dichloromethane (120 mL) was irradiated with 450 nm light for 12 hours at room temperature. The orange reaction mixture was washed with a 50:50 mixture of saturated aqueous sodium bicarbonate solution and saturated aqueous sodium thiosulfate solution. The organic phase was dried over magnesium sulfate, filtered and evaporated to dryness under reduced pressure. The crude residue was purified by flash chromatography on C-18 silica gel to give 6-(bromomethyl)-2,2-dimethyl- 1,3-dioxin-4-one as a yellow oil.1H NMR (400 MHz, chloroform) δ = 5.54 (s, 1H), 3.90 (s, 2H), 1.73 (s, 6H). Step 2: Synthesis of ethyl 6-(bromomethyl)-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3- carboxylate To a stirring solution of ethyl (Z)-3-(3,4-dichlorophenyl)-3-(ethylamino)prop-2-enoate (2.00 g, 6.94 mmol) in xylene (20.0 mL) was added 6-(bromomethyl)-2,2-dimethyl-1,3-dioxin-4-one (2.30 g, 10.4 mmol). The resultant reaction mixture was heated with stirring at 140 °C for 5 minutes. The cooled reaction mixture was diluted with ethyl acetate and the organic solution was washed with brine, dried over magnesium sulfate, filtered and evaporated to dryness under reduced pressure to 6- (bromomethyl)-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate as brown solid.1H NMR (400 MHz, DMSO-d6) δ = 7.89 (s, 1H), 7.79 (d, 1H), 7.49 (d, 1H), 6.59 (s, 1H), 4.72 (s, 2H), 3.82-3.77 (q, 4H), 1.11 (t, 3H), 0.84 (t, 3H). 82965-FF 28 Step 3: Synthesis of ethyl 2-(3,4-dichlorophenyl)-1-ethyl-6-formyl-4-oxo-pyridine-3-carboxylate To a stirring solution of ethyl 6-(bromomethyl)-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3- carboxylate (6.99 g, 16.1 mmol) and N-ethyl-N-isopropyl-propan-2-amine (3.67 mL, 21.0 mmol) in acetonitrile (140 mL) at 0 °C was added 4-methyl-4-oxido-morpholin-4-ium (2.92 g, 24.2 mmol) portion- wise. The reaction mixture was stirred at 25 °C for 2.5 hours. The reaction mixture was diluted with water and ethyl acetate and the phases were separated. The organic phase was washed with brine, dried over magnesium sulfate and evaporated to dryness under reduced pressure to give ethyl 2-(3,4- dichlorophenyl)-1-ethyl-6-formyl-4-oxo-pyridine-3-carboxylate a yellow solid. 1H NMR (400 MHz, chloroform) δ = 9.71 (s, 1H), 7.60 (d, 1H), 7.54 (d, 1H), 7.30 - 7.27 (m, 1H), 7.08 (s, 1H), 4.19 (m, 2H), 4.04 (dd, 2H), 1.13 (t, 3H), 1.00 (t, 3H). Step 4: Synthesis of 6-(3,4-dichlorophenyl)-5-ethoxycarbonyl-1-ethyl-4-oxo-pyridine-2- carboxylic acid To a stirring solution of ethyl 2-(3,4-dichlorophenyl)-1-ethyl-6-formyl-4-oxo-pyridine-3-carboxylate (5.67 g, 15.4 mmol) in tert-butanol (77 mL) and 2-methylbut-2-ene (77 mL) was added a solution of monosodium phosphate (4.20 g, 34.7 mmol) in water (39 mL). The reaction mixture was cooled to 0 °C and sodium chlorite (4.22 g, 46.2 mmol) was added portion-wise. The reaction mixture was warmed to room temperature and stirred for 2.5 hours. The resultant yellow solution was diluted with brine, methanol and 2M aqueous hydrochloric acid before extraction into ethyl acetate. The organic extract was extracted into saturated sodium metabisulfite solution. The aqueous phase was acidified to pH 1 by addition of 2M aqueous hydrochloric acid and extracted into dichloromethane. The organic extract was evaporated to dryness under reduced pressure to give 6-(3,4-dichlorophenyl)-5-ethoxycarbonyl-1- ethyl-4-oxo-pyridine-2-carboxylic acid as a colourless solid.1H NMR (400 MHz, DMSO-d6) δ = 7.92 (d, 1H), 7.82 (d, 1H), 7.53 (dd, 1H), 6.63 (s, 1H), 3.95 - 3.68 (m, 4H), 1.07 (t, 3H), 0.83 (t, 3H). 82965-FF 29 Step 5: Synthesis of ethyl 2-(3,4-dichlorophenyl)-1-ethyl-6-iodo-4-oxo-pyridine-3-carboxylate To a stirring solution of 6-(3,4-dichlorophenyl)-5-ethoxycarbonyl-1-ethyl-4-oxo-pyridine-2-carboxylic acid (1.42 g, 3.69 mmol) in methylsulfinylmethane (37 mL) was added iodine (0.281 g, 1.11 mmol). The reaction mixture was heated at 120 °C for 1.5 hours before being quenched with saturated sodium thiosulfate solution and extracted into dichloromethane. The organic extracts were washed with water and brine and passed through a phase-separator cartridge. The organic filtrate was evaporated to dryness under reduced pressure to give a yellow oil which was purified by flash chromatography on C- 18 silica gel to give ethyl 2-(3,4-dichlorophenyl)-1-ethyl-6-iodo-4-oxo-pyridine-3-carboxylate as a yellow solid.1H NMR (400 MHz, chloroform) δ = 7.59 (d, 1H), 7.52 (d, 1H), 7.26 (dd, 1H), 6.68 (s, 1H), 4.06 - 3.98 (m, 2H), 3.93 (q, 2H), 1.21 (t, 3H), 0.99 (t, 3H). Example 4: Synthesis of ethyl 2-(3,4-dichlorophenyl)-1-ethyl-6-fluoro-4-oxo-pyridine-3- carboxylate (Compound 7) A suspension of ethyl 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate (0.600 g, 1.60 mmol) and tetramethylammonium;fluoride (0.448 g, 4.80 mmol) in N,N-dimethylformamide (8 mL) was heated with stirring at 40 °C for 40 hours. The cooled reaction mixture was diluted with ethyl acetate and washed sequentially with water and brine. The organic extract was dried over anhydrous sodium sulfate, filtered and evaporated to dryness under reduced pressure. The crude product was purified by flash chromatography on C-18 silica to give ethyl 2-(3,4-dichlorophenyl)-1-ethyl-6-fluoro-4-oxo-pyridine- 3-carboxylate as a white solid.1H NMR (400MHz, chloroform) δ = 7.59 (d, 1H), 7.52 (d, 1H), 7.26 - 7.23 (m, 1H), 6.26 (d, 1H), 4.09 - 4.01 (m, 2H), 3.75 (qd, 2H), 1.22 (t, 3H), 1.00 (t, 3H). 82965-FF 30 Example 5: Synthesis of ethyl 6-bromo-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3- carboxylate Ethyl 6-chloro-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate (500 mg, 1.33 mmol) was dissolved in acetonitrile (13 mL) and trimethylsilyl bromide (600 μL, 4.46 mmol) added. The reaction mixture was then heated at 60 degrees for 3.5 hours. The cooled reaction mixture was neutralized with a saturated solution of sodium hydrogen carbonate. This mixture was then extracted with dichloromethane and the organic extracts dried over anhydrous sodium sulfate, filtered and evaporated to dryness under reduced pressure. The crude product was purified by flash chromatography on silica to give ethyl 6-bromo-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate as a pale yellow solid. Example 6: Synthesis of 6-bromo-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylic acid (Compound 8) Ethyl 6-bromo-2-(3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylate (40 mg, 0.10 mmol) and scandium triflate (49 mg, 0.10 mmol) were dissolved in a mixture of tetrahydrofuran (0.3 mL) and water (0.3 mL). The reaction mixture was then heated to 120 degrees for 45 minutes. The reaction mixture was then diluted with water and 2 M HCl solution and then extracted with dichloromethane. The organic extract was dried over anhydrous sodium sulfate, filtered and evaporated to dryness under reduced pressure. The crude product was purified by flash chromatography on C-18 silica to give 6-bromo-2- (3,4-dichlorophenyl)-1-ethyl-4-oxo-pyridine-3-carboxylic acid as a white solid.1H NMR (400MHz, chloroform) δ = 5.86 (br s, 1H), 7.60 (d, 1H), 7.35 (d, 1H), 7.19 (s, 1H), 7.11 (dd, 1H), 4.09 (q, 2H), 1.25 (t, 3H). 82965-FF 31 Table 2:1H NMR Data for selected compounds of the invention. Compound Compound Structure &1H NMR Data No. Name ethyl 6-chloro-2- (3,4- O O dichlorophenyl)- O CH31-ethyl-4-oxo- Cl 1 pyridine-3- Cl N carboxylate CH3 Cl 1H NMR (400 MHz, methanol) δ = 7.77 (d, 1H), 7.75 (d, 1H), 7.46 (dd, 1H), 6.74 (s, 1H), 4.12 - 3.95 (m, 4H), 1.25 (t, 3H), 0.97 (t, 3H) 6-chloro-2-(3,4- dichlorophenyl)- O O 1-ethyl-4-oxo- OH pyridine-3- Cl 2 carboxylic acid Cl N CH3Cl 1H NMR (400MHz, DMSO-d6) δ = 7.85 - 7.78 (m, 2H), 7.50 - 7.45 (m, 1H), 7.10 (s, 1H), 3.90 (br d, 2H), 1.12 (t, 3H) ethyl 2-(3,4- dichlorophenyl)- O O 1-ethyl-6-iodo-4- O CH3oxo-pyridine-3- Cl carboxylate 3 I N CH3Cl 1H NMR (400 MHz, chloroform) δ = 7.59 (d, 1H), 7.52 (d, 1H), 7.26 (dd, 1H), 6.68 (s, 1H), 4.06 - 3.98 (m, 2H), 3.93 (q, 2H), 1.21 (t, 3H), 0.99 (t, 3H) methyl 5-bromo- 2-(3,4- O O dichlorophenyl)- Br CH O31-ethyl-6-iodo-4- Cl 4 oxo-pyridine-3- I N carboxylate CH3Cl 1H NMR (400 MHz, chloroform) δ = 7.58 (d, 1H), 7.48 (d, 1H), 7.23 (dd, 1H), 4.21 (q, 2H), 3.57 (s, 3H), 1.19 (t, 3H) 82965-FF 32 Compound Compound Structure &1H NMR Data No. Name ethyl 6-chloro-2- (3-chloro-4- cyano-phenyl)- 1-ethyl-4-oxo- 5 pyridine-3- carboxylate 1H NMR (400MHz, DMSO-d6) δ = 8.17 (d, 1H), 8.07 (d, 1H), 7.52 (dd, 1H), 6.64 (s, 1H), 3.87 - 3.77 (m, 4H), 1.10 (t, 3H), 0.81 (t, 3H) 6-chloro-2-(4- chloro-3-cyano- phenyl)-1-ethyl- 4-oxo-pyridine- 6 3-carboxylic acid 1H NMR (400MHz, DMSO-d6) δ = 15.89 (s, 1H), 8.16 (d, 1H), 7.96 (s, 1H), 7.67 (d, 1H), 7.18 (s, 1H), 3.81 (q, 2H), 1.11 (t, 3H) ethyl 2-(3,4- dichlorophenyl)- 1-ethyl-6-fluoro- 4-oxo-pyridine- 3-carboxylate 7 1H NMR (400MHz, chloroform) δ = 7.59 (d, 1H), 7.52 (d, 1H), 7.26 - 7.23 (m, 1H), 6.26 (d, 1H), 4.09 - 4.01 (m, 2H), 3.75 (qd, 2H), 1.22 (t, 3H), 1.00 (t, 3H) 6-bromo-2-(3,4- dichlorophenyl)- O O 1-ethyl-4-oxo- OH pyridine-3- Cl 8 carboxylic acid Br N CH3Cl 1H NMR (400MHz, chloroform) δ = 5.86 (br s, 1H), 7.60 (d, 1H), 7.35 (d, 1H), 7.19 (s, 1H), 7.11 (dd, 1H), 4.09 (q, 2H), 1.25 (t, 3H) 82965-FF 33 Seeds of a variety of test species are sown in standard soil in pots (Setaria faberi (SETFA), Echinochloa crus-galli (ECHCG), Amaranthus palmeri (AMAPA), Zea mays (ZEAMX), Amaranthus retoflexus (AMARE),). After 8 days cultivation under controlled conditions in a glasshouse (at 24 °C / 16 °C, day / night; 14 hours light; 65 % humidity), the plants are sprayed with an aqueous spray solution derived from the formulation of the technical active ingredient in acetone / water (50:50) solution containing 0.5% Tween 20 (polyoxyethelyene sorbitan monolaurate, CAS RN 9005-64-5). Compounds are applied at 250 g / ha unless otherwise stated. The test plants are then grown in a glasshouse under controlled conditions in a glasshouse (at 24 °C / 16 °C, day / night; 14 hours light; 65 % humidity) and watered twice daily. After 13 days the test is evaluated for the percentage damage caused to the plant. The biological activities are shown in the following table on a five-point scale (5 = 81-100%; 4 = 61-80%; 3=41-60%; 2=21-40%; 1=1-20%; 0 = no activity; - = not tested). Table B1: Pre-Emergence Test Compound SETFA AMARE ECHCG AMAPA ZEAMX No. 2 5 3 3 2 1 6 5 5 2 3 0 Table B2: Post-Emergence Test Compound SETFA AMARE ECHCG AMAPA ZEAMX No. 2 4 1 3 1 0 6 4 0 1 0 1

Claims

82965-FF 34 CLAIMS:

1. A compound of Formula (I):R1is C1-C6alkyl, C1-C6alkoxy, C2-C6alkenyl, C2-C6alkynyl, C1-C6alkoxyC1-C6alkyl, or C3- C6cycloalkyl; R2is phenyl or heteroaryl, wherein the heteroaryl moiety is a 5- or 6-membered aromatic ring which comprises 1, 2, 3 or 4 heteroatoms individually selected from N, O and S, and wherein each phenyl and heteroaryl moiety may be optionally substituted with 1, 2, 3, or 4 groups, which may be the same or different, represented by R5; R3is hydrogen or C1-C6alkyl; R4is hydrogen or halogen; R5is cyano, nitro, halogen, C1-C6alkyl, C1-C6alkoxy, C1-C6haloalkyl, C1-C6haloalkoxy, C1- C6alkoxyC1-C6alkyl, C1-C6alkylsulfanyl, C1-C6alkylsulfinyl, C1-C6alkylsulfonyl, C1-C6alkylsulfonamido, C1-C6alkylcarbonyl, C1-C6alkoxycarbonyl, C1-C6alkylaminocarbonyl, C3-C6cycloalkyl, C3- C6cycloalkylaminocarbonyl, or N,N-di(C1-C4alkyl)aminocarbonyl; and X is halogen; or a salt or an N-oxide thereof.

2. The compound according to claim 1, wherein R1is C1-C3alkyl.

3. The compound according to claim 1 or claim 2, wherein R2is phenyl or pyridyl, wherein each phenyl and pyridyl moiety may be optionally substituted with 1 or 2 groups, which may be the same or different, represented by R5.

4. The compound according to any one of claims 1 to 3, wherein R2is phenyl optionally substituted with 1 or 2 groups, which may be the same or different, represented by R5.

5. The compound according to any one of claims 1 to 4, wherein R3is hydrogen or C1-C3alkyl 6. The compound according to any one of claims 1 to 5, wherein R4is hydrogen or bromo.82965-FF 35 7. The compound according to any one of claims 1 to 6, wherein X is chloro, fluoro, or iodo.

8. The compound according to any one of claims 1 to 7, wherein R5is cyano or halogen.

9. The compound according to any one of claims 1 to 8, wherein R1is ethyl.

10. The compound according to any one of claims 1 to 9, wherein R2is 3,4-dichlorophenyl or 3- chloro-4-cyanophenyl.

11. A herbicidal composition comprising a compound according to any one of the previous claims and an agriculturally acceptable formulation adjuvant.

12. A herbicidal composition according to claim 11, further comprising at least one additional pesticide.

13. A herbicidal composition according to claim 12, wherein the additional pesticide is a herbicide or herbicide safener.

14. A method of controlling weeds at a locus comprising applying to the locus of a weed controlling amount of a composition according to any one of claims 11 to 13.

15. Use of a compound of Formula (I) according to any one of claims 1 to 10 as a herbicide.

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