The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 17, 2015
Filed:
Jan. 12, 2012
Qunzhen Guo, Hangzhou, CN;
Guoping Cai, Hangzhou, CN;
Tangjun Wang, Hangzhou, CN;
Jiandi Yu, Hangzhou, CN;
Wei Liu, Hangzhou, CN;
Qunzhen Guo, Hangzhou, CN;
Guoping Cai, Hangzhou, CN;
Tangjun Wang, Hangzhou, CN;
Jiandi Yu, Hangzhou, CN;
Wei Liu, Hangzhou, CN;
Zhejiang Zhuji United Chemicals Co., Ltd, Hangzhou, Zhejiang, CN;
Luzhou Oriental Agrochemicals Co., Ltd., Luzhou, Sichuan, CN;
Abstract
A preparation method of carfentrazone-ethyl comprises steps of: reacting 1-(5-amino-4-chloro-2-fluorophenyl)-4-difluoromethyl-3-methyl-1H-1,2,4-triazol-5-one with acrylic acid through a diazo arylation reaction to give 2-chloro-3-{2-chloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,3-triazol-1-yl]-4-fluorophenyl}propionic acid; and reacting the 2-chloro-3-{2-chloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,3-triazol-1-yl]-4-fluorophenyl}propionic acid with ethanol through an esterification reaction in a presence of an acidic catalyst to give carfentrazone-ethyl.