Preparation method of phenoxycarboxylic acid herbicides
申请人:SHANDONG RAINBOW BIOTECH CO., LTD.
公开号:US11040933B2
公开(公告)日:2021-06-22
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; 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.
[EN] METHOD FOR PREPARING PHENOXY CARBOXYLIC ACID HERBICIDE<br/>[FR] PROCÉDÉ DE PRÉPARATION D'UN HERBICIDE À BASE D'ACIDE PHÉNOXYCARBOXYLIQUE<br/>[ZH] 一种苯氧羧酸类除草剂的制备方法
[EN] PREPARATION METHOD OF PHENOXYCARBOXYLIC ACID HERBICIDES<br/>[FR] PROCÉDÉ DE PRÉPARATION D'HERBICIDES À BASE D'ACIDE PHÉNOXYCARBOXYLIQUE<br/>[ZH] 一种苯氧羧酸类除草剂的制备方法
PREPARATION METHOD OF PHENOXYCARBOXYLIC ACID HERBICIDES
申请人:SHANDONG RAINBOW BIOTECH CO., LTD.
公开号:US20210017113A1
公开(公告)日:2021-01-21
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 ClR
1
COOR, in which R
1
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; 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 R
3
is H, Cl or CH
3
.