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公开(公告)号：US3822311A
公开(公告)日：1974-07-02
申请号：US33925473
申请日：1973-03-08
Applicant: BAYER AG
Inventor： WEDEMEYER K , HELM R , PAWELLEK D
IPC: C07B61/00 , B01J31/00 , C07C67/00 , C07C201/00 , C07C205/58 , C07C79/46
CPC classification number: C07C205/58 , C07C201/12
Abstract: 2,5-DICHLORO-3-NITRO-BENZOIC ACID IS PRODUCED BY REACTING 5-CHLORO-3-NITRO-SALICYLIC ACID WITH AN EXCESS OF A CHLORINATING AGENT, PREFERABLY AT THE REFLUX TEMPERATURE OF THE MIXTURE, IN THE PRESENCE OF A N,N-DIALKYLCARBOXYLIC ACID AMIDE OR A TERTIARY AMINE AS A CATALYST, AND SPANIFYING, UNDER ACID CONDITIONS, THE ACID CHLORIDE THEREBY PRODUCED, THE YIELD THE DESIRED COMPOUND.
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2.发明授权Process for preparing 2-aminobenzothiazole and its n-alkyl substitution products from 2-mercaptobenzothiazole 失效2-甲基苯并噻唑的2-氨基苯并噻唑及其N-烷基取代产物的制备方法
公开(公告)号：US3781297A
公开(公告)日：1973-12-25
申请号：US3781297D
申请日：1971-12-02
Applicant: BAYER AG
Inventor： PAWELLEK D , WEDEMEYER K
IPC: C07D277/82 , C07D91/46
CPC classification number: C07D277/82
Abstract: 2-AMINOBENZOTHIAZOLE AND ITS N-ALKYL SUBSTITUTED PRODUCTS ARE PREPARED REACTING 2-MERCAPTOBENZOTHIAZOLE WITH AN AMINE AND SULFUR DIOXIDE INTHHE PRESENCE OF A METAL OXIDE, HYDROXIDE OR SALT CATALYST AT ELEVATED TEMPERATURE AND PRESSURE.
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