发明授权
US5936094A Process for the preparation of 1,2-benzisothiazolin-3-ones 失效
1,2-苯并异噻唑啉-3-酮的制备方法

  • 专利标题: Process for the preparation of 1,2-benzisothiazolin-3-ones
  • 专利标题(中): 1,2-苯并异噻唑啉-3-酮的制备方法
  • 申请号: US875075
    申请日: 1997-07-17
  • 公开(公告)号: US5936094A
    公开(公告)日: 1999-08-10
  • 发明人: Mark Robert James
  • 申请人: Mark Robert James
  • 申请人地址: GBX London
  • 专利权人: Zeneca Limited
  • 当前专利权人: Zeneca Limited
  • 当前专利权人地址: GBX London
  • 优先权: GBX9505377 19950317
  • 主分类号: C07D275/04
  • IPC分类号: C07D275/04 C07D275/06
Process for the preparation of 1,2-benzisothiazolin-3-ones
摘要:
A process for making a 2-alkylbenzisothiazolinone which comprises reacting a bisamide of formula ##STR1## in water or an organic liquid containing water with a bisulphite or bisulphite release agent to form a Bunte salt and converting the Bunte salt under alkaline conditions to 2-alkyl-BIT. R is alkyl. Preferred substituents R are butyl, hexyl, 2-ethylbutyl and 2-ethylhexyl.
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