发明授权
- 专利标题: Process for the preparation of 2,6-difluoroaniline
- 专利标题(中): 2,6-二氟苯胺的制备方法
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申请号: US676017申请日: 1991-03-27
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公开(公告)号: US5091580A公开(公告)日: 1992-02-25
- 发明人: R. Garth Pews , James A. Gall
- 申请人: R. Garth Pews , James A. Gall
- 申请人地址: IN Indianapolis
- 专利权人: DowElanco
- 当前专利权人: DowElanco
- 当前专利权人地址: IN Indianapolis
- 主分类号: B01J23/44
- IPC分类号: B01J23/44 ; C07B61/00 ; C07C17/20 ; C07C25/13 ; C07C209/10 ; C07C211/45 ; C07C211/52
摘要:
2,6-Difluoroaniline is prepared from 1,2,3-trichlorobenzene by partial fluorine exchange to a mixture of 2,6-difluorochlorobenzene and 2,3-difluorochlorobenzene, amination of the chloro substituents, and separation of the desired product from the isomeric 2,3-difluoroaniline. By incorporating a selective reduction into the process immediately after the partial fluorine exchange, the undesirable 2,3-difluorochlorobenzene is converted into valuable ortho-difluorobenzene and the 2,3-difluoroaniline isomer is avoided.
公开/授权文献
- US4017034A Art of dry milling sorghum and other cereal grains 公开/授权日:1977-04-12
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