发明授权
US4376213A Method for optical resolution of 2-(4-chlorophenyl)-3-methylbutanoic acid
失效
2-(4-氯苯基)-3-甲基丁酸的光学拆分方法
- 专利标题: Method for optical resolution of 2-(4-chlorophenyl)-3-methylbutanoic acid
- 专利标题(中): 2-(4-氯苯基)-3-甲基丁酸的光学拆分方法
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申请号: US344523申请日: 1982-02-01
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公开(公告)号: US4376213A公开(公告)日: 1983-03-08
- 发明人: Hiroyuki Nohira , Daiyo Terunuma , Shinji Koube
- 申请人: Hiroyuki Nohira , Daiyo Terunuma , Shinji Koube
- 申请人地址: JPX Osaka
- 专利权人: Sumitomo Chemical Company, Limited
- 当前专利权人: Sumitomo Chemical Company, Limited
- 当前专利权人地址: JPX Osaka
- 优先权: JPX56-31248 19810306
- 主分类号: C07C57/58
- IPC分类号: C07C57/58 ; C07B31/00 ; C07B57/00 ; C07C51/00 ; C07C51/43 ; C07C51/487 ; C07C67/00 ; C07B19/00
摘要:
A method for optical resolution of 2-(4-chlorophenyl)-3-methylbutanoic acid, which comprises crystallizing out the salt between (+) or (-)-2-(4-chlorophenyl)-3-methylbutanoic acid and diethylamine in a molar proportion of 2:1 predominantly from a super-saturated solution of the salt of 2-(4-chlorophenyl)-3-methylbutanoic acid with diethylamine, collecting the crystallized salt and decomposing the collected salt under acidic conditions to obtain the corresponding optically active acid.
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