Efficient cyhalothrin

Abstract

The invention relates to an efficient cyhalothrin and a manufacturing technology thereof, the manufacturing technology is as follows: (1) layer addition-reaction materials are 3, 3-dimethyl-4-pentenoic acid methyl ester and trichlorotrifluoroethane; (2) cyclization- reaction materials are tertiary butyl alcohol, Bifenthrin and sodium tert-butoxide; (3) elimination of hydrolysis-reaction materials are potassium hydroxide and cyclic Bifenthrin, and by exsolution, hydrolysis, separation and filtration 2-cis-3-(2-chloro-3, 3, 3-trifluro-1-propenyl)-2, 2-dimethyl cyclopropane carboxylic acid can be prepared; (4) chloroformylation-reaction materials are thionyl chloride, methylbenzene and 2-cis-3-(2-chloro-3, 3, 3-trifluro-1-propenyl)-2, 2-dimethyl cyclopropane carboxylic acid, and by exsolution and distillation, 3-(2-chloro-3, 3, 3-trifluoro-1-propenyl)-2, 2-dimethylcyclopropane carbonyl chloride is obtained; (5) esterification- reaction materials are phenylate aldehyde, sodium cyanide, PTC and 3-(2-chloro-3, 3, 3-trifluoro-1-propenyl)-2, 2-dimethylcyclopropane carbonyl chloride, by water rinse, exsolution and distillation, the cyhalothrin is prepared; and (7) epimerization-inoculating crystal is added for carrying out an epimerization reaction, and after the reaction, an end product-the efficient cyhalothrin is obtained by filtration and drying. As the invention adopts the technical proposal, the efficient cyhalothrin prepared by the invention greatly shortens the technological route and obviously improves the reaction efficiency through the improvement of technical skills, thereby reducing the cost of industrialization.

Description

technical field [0001] The invention relates to a pesticide, especially a kind of efficient cyhalothrin. Background technique [0002] Lambda-cyhalothrin is a patented product first successfully developed by the British ICI company in 1982 (the current patent protection period has expired). The product is prepared through processes such as addition, cyclization, elimination of hydrolysis, separation, acyl chloride, esterification, and epimerization. The synthesis process route is long, and the reaction efficiency in the esterification reaction is low, and the industrialization cost Relatively high, hindering the development of this product. Contents of the invention [0003] In view of the above-mentioned shortcomings, the present invention provides a kind of efficient cyhalothrin, through the improvement of the process technology, the process route is shortened, and at the same time, a new catalyst is used in the esterification reaction to improve the reaction efficiency...

AI Technical Summary

Problems solved by technology

The product is prepared through processes such as addition, cyclization, elimination of hydrolysis, separation, acyl chloride, esterification, and epimerization. The synthesis process route is long, and the reaction efficiency in the esterification reaction is low, and the industrialization cost Relatively high, which hinders the development of the product