Method used for preparing pretilachlor

Abstract

The invention discloses a method used for preparing pretilachlor. The method comprises a step used for preparing pretilachlor. According to the method, ethylene glycol monopropyl ether is reacted with thionyl chloride so as to obtain chloric ether; chloric ether and aniline are subjected to condensation reaction so as to obtain a condensation product; the condensation product is subjected to rectification so as to obtain rectified N,N,N',N'-tetramethyl-2,2'-oxybis(ethylamine); and rectified N,N,N',N'-tetramethyl-2,2'-oxybis(ethylamine) is subjected to acylation so as to obtain pretilachlor. The method is capable of increasing production efficiency, reducing production cost, improving production environment, and increasing yield of pretilachlor obviously.

Description

Technical field: [0001] The invention relates to the technical field of chemistry and chemical engineering, and more specifically relates to a method for preparing pretilachlor. Background technique: [0002] Pretilachlor is a special herbicide for paddy fields with high selectivity. It is a pre-emergence herbicide and is mainly used to control gramineous weeds. The product is a 2-chloride acetylaniline herbicide, which is a cell division inhibitor. It can be used in soil treatment to control barnyardgrass, heterosedge, cattle felt, bermudagrass, Alisma narrowleaf, etc. It is usually used 3-5 days before transplanting. This product has poor selectivity to wet-inserted rice when it is applied alone, but it has excellent selectivity to in-line rice when it is used together with chlorpyrifos. [0003] Due to the large material loss in the process of generating pretilachlor, and the original technology has a greater impact on the environment, the technicians in this industry a...

AI Technical Summary

Problems solved by technology

This product has poor selectivity to wet-inserted rice when it is applied alone, but it has excellent selectivity to in-line rice when it is used together with chlorpyrifos