Invention Grant
US08735600B2 Process for purification of 1-methylpyrazole-4-carboxylic acid esters
有权
纯化1-甲基吡唑-4-羧酸酯的方法
- Patent Title: Process for purification of 1-methylpyrazole-4-carboxylic acid esters
- Patent Title (中): 纯化1-甲基吡唑-4-羧酸酯的方法
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Application No.: US13320730Application Date: 2010-04-20
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Publication No.: US08735600B2Publication Date: 2014-05-27
- Inventor: Graham McDougald , James Peter Muxworthy , Beverley Ann Wilde
- Applicant: Graham McDougald , James Peter Muxworthy , Beverley Ann Wilde
- Applicant Address: GB Guildford, Surrey
- Assignee: Syngenta Limited
- Current Assignee: Syngenta Limited
- Current Assignee Address: GB Guildford, Surrey
- Agent R. Kody Jones
- Priority: GB0908435.1 20090515
- International Application: PCT/EP2010/055174 WO 20100420
- International Announcement: WO2010/130532 WO 20101118
- Main IPC: C07D231/14
- IPC: C07D231/14 ; C07D409/12
Abstract:
The present invention relates to improvements in processes towards the production 3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxylic acid, which is a useful intermediate in fungicide production. In particular, the invention relates to a process for treating a compound of formula III, wherein R1 is C1-C6 alkyl and R2 is CF3, CF2H or CFH2, comprising the steps of a) contacting a compound of formula III with base, and b) separating the compound of formula III and the base.
Public/Granted literature
- US20120065407A1 PROCESS FOR PURIFICATION OF 1-METHYLPYRAZOLE-4-CARBOXYLIC ACID ESTERS Public/Granted day:2012-03-15
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