Method for synthesizing R-(+)-2-(4-hydroxyphenoxy)propionic acid through gas phase catalysis

A hydroxyphenoxy, gas-phase technology, applied in the field of R--2-propionic acid preparation, to achieve the effect of less equipment corrosion, good stability and strong acidity
CN111187155AActive Publication Date: 2020-05-22JIANGSU SANJILI CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU SANJILI CHEM
Publication Date
2020-05-22
Patent Text Reader

Abstract

The invention discloses a method for synthesizing R-(+)-2-(4-hydroxyphenoxy)propionic acid through gas phase catalysis, and belongs to the field of organic synthesis. Hydroquinone and D-lactic acid are used as raw materials, and nitrogen is used as a carrier gas. The hydroquinone and the D-lactic acid are completely gasified and then enter a fixed bed reactor, and the R-(+)-2-(4-hydroxyphenoxy)propionic acid is continuously synthesized in a gas phase under the catalysis of a supported heteropolyacid catalyst. The method has the advantages of mild reaction conditions, simple reaction process, high effective conversion rate of hydroquinone and high selectivity of the R-(+)-2-(4-hydroxyphenoxy) propionic acid, and is completely suitable for industrial production, and the self-made supported heteropolyacid solid catalyst has excellent catalytic activity, strong acidity, good stability and no pollution to the environment, and is a green catalyst.
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Description

technical field

[0001] The present invention relates to a kind of preparation method of R-(+)-2-(4-hydroxyphenoxy group) propionic acid, specifically under the gas phase condition heteropoly acid catalyzes hydroquinone and D-lactic acid to prepare R-( +)-2-(4-hydroxyphenoxy)propionic acid method. Background technique

[0002] R-(+)-2-(4-hydroxyphenoxy)propionic acid is mainly used for the synthesis of R-(+)-2-(4-hydroxyphenoxy)propionic acid methyl ester, R-(+)-2 -(4-hydroxyphenoxy) ethyl propionate, R-(+)-2-(4-hydroxyphenoxy) butyl propionate and other special intermediates and their downstream products quizalofop-p Aryloxyphenoxypropionate herbicides such as fluazifop-methyl, high-efficiency fluroxyfop, clodinafop-propargyl, etc. Aryloxyphenoxypropionate herbicides are a class of herbicides that can effectively control grass weeds. They have the characteristics of high efficiency, low toxicity, and safety to subsequent crops. They are also a class of herbicides that deve...

Claims

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