发明授权
US07772436B2 Process for producing 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl
有权
制备2,2'-双(三氟甲基)-4,4'-二氨基联苯的方法
- 专利标题: Process for producing 2,2′-bis(trifluoromethyl)-4,4′-diaminobiphenyl
- 专利标题(中): 制备2,2'-双(三氟甲基)-4,4'-二氨基联苯的方法
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申请号: US11666548申请日: 2004-11-05
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公开(公告)号: US07772436B2公开(公告)日: 2010-08-10
- 发明人: Takeshi Namekata , Tetsuo Murata
- 申请人: Takeshi Namekata , Tetsuo Murata
- 申请人地址: JP Sapporo-Shi, Hokkaido
- 专利权人: Air Water Inc.
- 当前专利权人: Air Water Inc.
- 当前专利权人地址: JP Sapporo-Shi, Hokkaido
- 代理机构: Buchanan Ingersoll & Rooney PC
- 国际申请: PCT/JP2004/016403 WO 20041105
- 国际公布: WO2006/048935 WO 20060511
- 主分类号: C07C211/00
- IPC分类号: C07C211/00
摘要:
A process for producing 2,2′-bis (trifluoromethyl)-4,4′-diaminobiphenyl which is useful as a raw material for polyimide resin, etc.In benzidine rearrangement of 3,3′-bis(trifluoromethyl) hydrazobenzene in the presence of an inorganic acid such as sulfuric acid aqueous solution or concentrated hydrochloric acid, use of a water-immiscible organic solvent such as toluene as reaction solvent can increase the yield of the product.3,3′-bis(trifluoromethyl) hydrazobenzene can be synthesized by reduction of m-nitrobenzotrifluoride.
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