发明授权
US4994611A Process for the production of N,N'-bis-(3-aminophenyl)-ureas
失效
制备N,N'-二 - (3-氨基苯基) - 脲的方法
- 专利标题: Process for the production of N,N'-bis-(3-aminophenyl)-ureas
- 专利标题(中): 制备N,N'-二 - (3-氨基苯基) - 脲的方法
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申请号: US436393申请日: 1989-11-14
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公开(公告)号: US4994611A公开(公告)日: 1991-02-19
- 发明人: Andreas Ruckes , Gerhard Grogler , Richard Kopp
- 申请人: Andreas Ruckes , Gerhard Grogler , Richard Kopp
- 申请人地址: DEX Leverkusen
- 专利权人: Bayer Aktiengesellschaft
- 当前专利权人: Bayer Aktiengesellschaft
- 当前专利权人地址: DEX Leverkusen
- 优先权: DEX3843410 19881223
- 主分类号: C07C273/18
- IPC分类号: C07C273/18 ; C07C275/40
摘要:
The present invention is directed to a process for the preparation of N,N'-bis-(3-aminophenyl)-ureas corresponding to formula (I) ##STR1## wherein R represents a linear or branched C.sub.1 -C.sub.6 alkyl group which is in the 2-, 4- and/or 6-position,characterized in that the corresponding phenylene diamines are reacted with urea in a molar ratio of greater than 2:1 in chlorobenzene as solvent.