- 专利标题: PREPARATION OF 2-CHLORO-4-FLUORO-5-NITROBENZOIC ACID
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申请号: PCT/IL2022/050321申请日: 2022-03-22
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公开(公告)号: WO2022201155A1公开(公告)日: 2022-09-29
- 发明人: GRABARNICK, Michael , JHA, Ashok Kumar , GALGE, Revanappa Vasantrao
- 申请人: ADAMA AGAN LTD.
- 申请人地址: P.O. Box 262
- 专利权人: ADAMA AGAN LTD.
- 当前专利权人: ADAMA AGAN LTD.
- 当前专利权人地址: P.O. Box 262
- 代理机构: PYERNIK, Moshe et al.
- 优先权: IN202131013524 2021-03-26
- 主分类号: C07D239/10
- IPC分类号: C07D239/10 ; C07C205/12 ; C07C209/36 ; C07C269/04 ; C07C271/28 ; C07C303/34 ; C07C307/06 ; A01N43/54
摘要:
The present invention relates to a novel nitration process of 2- chloro -4- fluorobenzoic acid to 2-chloro-4- fluoro-5-nitrobenzoic acid, 2-chloro-4- f luoro-3 -nitrobenzoic acid and 3, 5-dinitro-2-chloro-4- fluorobenzoic acid; purifying the crude reaction product; and recovering 2-chloro-4- fluoro-5-nitrobenzoic acid in an essentially pure form, which can be used in the synthesis of the herbicide saflufenacil.