发明授权
US5905157A Process for producing
2-(methylthio)-5-(trifluoromethyl)-1,3,4-thiadiazole using
methyldithiocarbazinate and trifluoroacetic acid
失效
甲基二硫代肼基甲酸酯和三氟乙酸生产2-(甲硫基)-5-(三氟甲基)-1,3,4-噻二唑的方法
- 专利标题: Process for producing 2-(methylthio)-5-(trifluoromethyl)-1,3,4-thiadiazole using methyldithiocarbazinate and trifluoroacetic acid
- 专利标题(中): 甲基二硫代肼基甲酸酯和三氟乙酸生产2-(甲硫基)-5-(三氟甲基)-1,3,4-噻二唑的方法
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申请号: US989152申请日: 1997-12-12
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公开(公告)号: US5905157A公开(公告)日: 1999-05-18
- 发明人: Vijay C. Desai , Peter E. Newallis , Vidyanatha A. Prasad , Herman Seifert
- 申请人: Vijay C. Desai , Peter E. Newallis , Vidyanatha A. Prasad , Herman Seifert
- 申请人地址: PA Pittsburgh DEX Leverkusen
- 专利权人: Bayer Corporation,Bayer Aktiengesellschaft
- 当前专利权人: Bayer Corporation,Bayer Aktiengesellschaft
- 当前专利权人地址: PA Pittsburgh DEX Leverkusen
- 主分类号: C07D285/12
- IPC分类号: C07D285/12 ; C07D285/125
摘要:
The present invention provides a process of making 2-(methylthio)-5-(trifluoromethyl)-1,3,4-thiadiazole. The process includes the steps of (a) reacting methyldithiocarbazinate with a molar excess of trifluoroacetic acid; and (b) removing the water and excess trifluoroacetic acid. Water and excess trifluoroacetic acid are preferably removed via distillation.
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