发明授权
- 专利标题: Method for the production of 2,4,5-trimethylphenyl acetic acid
- 专利标题(中): 2,4,5-三甲基苯基乙酸的制备方法
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申请号: US10510288申请日: 2003-03-27
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公开(公告)号: US07019166B2公开(公告)日: 2006-03-28
- 发明人: Thomas Himmler
- 申请人: Thomas Himmler
- 申请人地址: DE Monheim
- 专利权人: Bayer CropScience AG
- 当前专利权人: Bayer CropScience AG
- 当前专利权人地址: DE Monheim
- 代理商 Richard E. L. Henderson; Raymond J. Harmuth
- 优先权: DE10215294 20020408
- 国际申请: PCT/EP03/03180 WO 20030327
- 国际公布: WO03/084914 WO 20031016
- 主分类号: C07C53/134
- IPC分类号: C07C53/134 ; C07C53/38
摘要:
The present invention relates to a novel process for preparing 2,4,5-trimethylphenyl-acetic acid by reacting pseudocumene with dichloroacetyl chloride in a Friedel-Crafts reaction to give 2,2-dichloro-1-(2,4,5-trimethylphenyl)ethanone, converting the 2,2-dichloro-1-(2,4,5-trimethylphenyl)ethanone to 2,4,5-trimethylmandelic acid using an alkali metal hydroxide and reducing the 2,4,5-trimethylmandelic acid to 2,4,5-tri-methylphenylacetic acid.
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