38 results about "Ethyl nicotinate" patented technology

The invention discloses a phagostimulant capable of improving the prevention and control effect of cotton flower thrips and application of the phagostimulant. The phagostimulant is prepared from the following components in parts by weight: 10 to 30 parts of p-methoxycinnamyl aldehyde, 5 to 40 parts of anisaldehyde, 40 to 70 parts of ethyl nicotinate and 10 parts of a cosolvent. The phagostimulant is prepared from the following components in parts by weight: 10 to 30 parts of p-methoxycinnamyl aldehyde, 5 to 40 parts of anisaldehyde, 40 to 70 parts of ethyl nicotinate and 10 parts of cosolvent. By utilizing the tropism of the cotton flower thrips to specific volatile compounds and through the synergistic effect of the three plant source compounds, pests hidden in stamens, petal wrinkles, leaf backs and other hidden parts are attracted to a pesticide application area, the contact area of insect bodies and the pesticide is remarkably increased, and therefore the prevention and control effect is improved. Field tests show that when an optimal formula (the ratio of p-methoxycinnamaldehyde to anisaldehyde to ethyl nicotinate to the cosolvent is 20: 20: 50: 10) is matched with spinetoram for use, the control effect can reach 84.43%-92.22%, the control effect is remarkably improved compared with that of single use of an insecticide, and a good control effect is shown. The method is safe and environment-friendly, reduces the amount and increases the efficiency, and has remarkable economic and ecological benefits.

The invention discloses a preparation process of 5-bromonicotinic acid, which comprises the following steps: sequentially adding ethyl nicotinate and pinacol borane into a reaction kettle, heating to react, adding N-bromosuccinimide into the reaction kettle, maintaining the reaction temperature, and filtering to remove a byproduct succinimide after the reaction is finished. And carrying out reduced pressure distillation to recover the solvent to obtain the ethyl 5-bromonicotinate. Adding ethyl 5-bromonicotinate into another reaction kettle, adding an alkali solution, heating, stirring for reaction, cooling reaction liquid after the reaction is finished, dropwise adding hydrochloric acid to adjust the pH value, cooling, crystallizing, filtering, washing a filter cake, and drying to obtain a 5-bromonicotinic acid finished product. The total yield gt of the preparation process of the 5-bromonicotinic acid; the HPLC purity is gt; 99%. The process is simple and convenient to operate and easy to implement, raw materials are cheap and easy to obtain, reaction conditions are mild, high-temperature and high-pressure reaction is not needed, and requirements on equipment are reduced. The whole process is safer to the environment, and green and pollution-free production can be realized.

The invention belongs to the field of organic synthesis, and particularly relates to a method for industrially producing 2-chloronicotinic acid, which comprises the following steps: carrying out chlorination on ethyl nicotinate in the presence of a catalyst metal benzimidazole ionic liquid IL-1 and a chlorinating agent tetrachloro glycoluril to generate ethyl 2-chloronicotinate; 2-chloronicotinic acid ethyl ester is subjected to a hydrolysis reaction in the presence of alkali, then the pH value of the solution is adjusted to be 2-4 with acid, and 2-chloronicotinic acid is obtained. The method has the advantages of mild reaction conditions, no use of dangerous raw materials, environmental protection, simple post-treatment operation, high yield and purity, and suitableness for industrial production.

The invention discloses a preparation method of trigonelline inner salt and application of the trigonelline inner salt in inhibition of algae growth, the preparation method comprises the following steps: S1, ethyl nicotinate reacts with dimethyl sulfate in methanol to obtain N-methyl ethyl nicotinate monomethyl sulfate salt; s2, stirring and reacting with alkali and thiourea in deionized water while heating to obtain a trigonelline inner salt crude product; and S3, adding an acid to adjust the pH value, adding methanol, filtering, concentrating the solvent, and pulping by using isopropanol to obtain a pure product of the trigonelline inner salt. The method provided by the invention effectively reduces the synthesis cost, avoids the use of a large amount of dangerous reagents, eliminates the residue of toxic reagents, effectively reduces the generation of industrial three wastes, and has the advantages of simple process, convenient operation, cheap and easily available raw materials, high yield, and facilitation of large-scale industrial production. Experimental studies show that the trigonelline inner salt has obvious effects of inhibiting algae growth and killing algae, and can be applied to algicides or inhibiting algal blooms in water.

The invention belongs to the field of green prevention and control of agricultural pests, and particularly relates to a method for trapping Frankliniella occidentalis based on an attractant in combination with an LED lamp and application of the method. According to the method, p-methoxybenzaldehyde, cinnamyl aldehyde and ethyl nicotinate are compounded into the attractant according to the mass ratio of 3: 1: 1, and when the attractant is applied to the field, a rubber head loaded with the Frankliniella occidentalis attractant is placed on an insect sticking plate, and the insect sticking plate is fixed on a light source trap for use. When the Frankliniella occidentalis attractant is used in cooperation with a blue LED lamp, the number of attracted insects is the maximum. The method can trap and kill female and male Frankliniella occidentalis at the same time, can reduce the harm to a certain extent, and is beneficial to reducing the use amount of pesticides, protecting natural enemies and protecting the environment.