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Title:
PREPARATION METHOD OF PHENOXYCARBOXYLIC ACID HERBICIDES
Document Type and Number:
WIPO Patent Application WO/2019/179267
Kind Code:
A1
Abstract:
Disclosed is a preparation method of phenoxycarboxylic acid herbicides. The preparation method comprises the following steps. S1: mixing an anhydrous phenol and a basic substance with a chloro-substituted carboxylic acid ester and performing a one-pot condensation reaction in an anhydrous system to obtain a phenoxycarboxylic acid ester. The chloro-substituted carboxylic acid ester is represented by the formula ClR1COOR, in which R1 is a C1-3 alkanediyl or alkylidene group, R is a C1-10 alkyl group or a C3-10 cycloalkyl group; S2: the phenoxycarboxylic acid ester undergoes selective chlorination with a chlorinating agent in the presence of a first catalyst and a second catalyst to obtain a chloro-substituted phenoxycarboxylic acid ester, in which the first catalyst is a Lewis acid, and the second catalyst is a C5-22 thioether compound, a thiazole compound, an isothiazole compound or a thiophene compound; and S3: the chloro-substituted phenoxycarboxylic acid ester undergoes an acid hydrolysis reaction to obtain a phenoxycarboxylic acid herbicide represented by formula I, in which R3 is H, Cl or CH3. The invention is capable of improving product quality and production operation environment, and produces little solid, liquid or gaseous waste.

Inventors:
SUN GUOQING (CN)
HOU YONGSHENG (CN)
ZHANG LIGUO (CN)
CHI ZHILONG (CN)
HU YISHAN (CN)
Application Number:
CN2019/075321
Publication Date:
September 26, 2019
Filing Date:
February 18, 2019
Export Citation:
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Assignee:
SHANDONG RAINBOW BIOTECH CO LTD (CN)
International Classes:
C07C51/09; C07C59/68; C07C59/70
Foreign References:
CN108947794A2018-12-07
CN108947822A2018-12-07
CN108947838A2018-12-07
US4326882A1982-04-27
CN106892808A2017-06-27
CN106278862A2017-01-04
Other References:
SUN CHANGIJUN ET AL.: "Synthesis of 2-4- Dichlorophenol by selective chlorination", HENAN CHEMICAL INDUSTRY, no. 11, 27 November 1990 (1990-11-27), pages 19
Attorney, Agent or Firm:
UNITALEN ATTORNEYS AT LAW (CN)
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