发明公开
EP0429848A3 Preparation of 3,4-difluorobenzoic acid by the decarboxylation of 4,5-difluorophthalic anhydride or 4,5-difluorophthalic acid
失效
通过4,5-二氟羟基化合物或4,5-二氟磷酸的脱羧制备3,4-二氟代苯甲酸
- 专利标题: Preparation of 3,4-difluorobenzoic acid by the decarboxylation of 4,5-difluorophthalic anhydride or 4,5-difluorophthalic acid
- 专利标题(中): 通过4,5-二氟羟基化合物或4,5-二氟磷酸的脱羧制备3,4-二氟代苯甲酸
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申请号: EP90120297.8申请日: 1990-10-23
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公开(公告)号: EP0429848A3公开(公告)日: 1992-02-05
- 发明人: Fertel, Lawrence B. , O'Reilly, Neil J.
- 申请人: OCCIDENTAL CHEMICAL CORPORATION
- 申请人地址: P.O. Box 189 Niagara Falls New York 14302 US
- 专利权人: OCCIDENTAL CHEMICAL CORPORATION
- 当前专利权人: OCCIDENTAL CHEMICAL CORPORATION
- 当前专利权人地址: P.O. Box 189 Niagara Falls New York 14302 US
- 代理机构: VOSSIUS & PARTNER
- 优先权: US439228 19891120
- 主分类号: C07C51/38
- IPC分类号: C07C51/38
摘要:
4,5-Difluorophthalic anhydride and 4,5-difluorophthalic acid may be decarboxylated in high yield to 3,4-difluorobenzoic acid by heating in N-methyl-2-pyrrolidone or dimethyl acetamide using copper, copper oxide, copper salts, or halides and salts of Zn, Cd, Ag and Ni as a catalyst.
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