New technology of synthesizing fenoxycarb

Abstract

A process for synthesizing fenoxycarb by use of composite catalyst incldues such steps as reaction between phenol and p-chlorophenol under action of copmosite catalyst in alkaline condition to obtain 4-phenoxyphenol, and reating on 2-ethyl chloroethylformate. Said composite catalyst is also disclosed.

Description

technical field The present invention relates to a kind of new technology of synthesizing fenoxycarb, specifically relate to a kind of new technology that adopts composite catalyst to synthesize fenoxycarb. Background technique Fenoxycarb, also known as fenoxycarb and fenoxycarb, has a chemical name of 2-(p-phenoxyphenoxy)ethyl carbamate, which was developed by Ciba-Geigy in Switzerland in 1982. It is the only juvenile hormone pesticide with broad-spectrum insecticidal effect successfully developed so far. The pesticide has the advantages of low toxicity, high efficiency, broad spectrum, not easy to produce resistance, and does not pollute the environment. Especially it has special effects on pests that have developed resistance to conventional pesticides such as pyrethroids and organophosphorus, such as diamondback moth, beet armyworm, cabbage caterpillar, cabbage aphid, apple yellow aphid, etc. It is an ideal medicine for pollution agricultural production. Fenoxycarb ...

AI Technical Summary

Problems solved by technology

At present, the catalysts used in the production process of fenoxycarb mainly include active copper powder, Cu 2 O, CuCl, CuBr, etc., the active copper powder is easily oxidized, when the catalyst and the reaction mixture are exposed to the air (especially at high temperature), its catalytic activity and selectivity will drop rapidly, and the copper salt will not dissolve in the reaction system. What happens is a liquid-solid complex phase catalytic reaction, the reaction time is long, the reaction temperature is high, and the yield is low

Therefore, the high production cost limits the popularization and use of fenoxycarb

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