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    PROCESS FOR THE PREPARATION OF BENZIMIDAZOLONES
    3.
    发明专利
    PROCESS FOR THE PREPARATION OF BENZIMIDAZOLONES 未知

    公开(公告)号：CA2003770A1

    公开(公告)日：1990-05-25

    申请号：CA2003770

    申请日：1989-11-24

    Applicant: HOECHST AG

    Inventor： MEIER MICHAEL ,  SEMLER GUNTHER

    IPC: C07D235/26

    Abstract: HOE 88/F 331 of the disclosure: Process for the preparation of benzimidazolones Process for the preparation of benzimidazolones of the formula (1) (1) in which R1 and R2 are identical or different and denote hydrogen or halogen atoms, or alkyl(C1-C4), alkoxy(C1-C4), trifluoromethyl, phenyl, phenoxy or nitro groups, by reacting o-phenylenediamines of the formula (2) (2) in which R1 and R2 have the meaning given, with phosgene in water in the presence of an alkali metal base or alkaline earth metal base or a salt of an alkali metal hydroxide or alkaline earth metal hydroxide and a weakly inorganic or organic acid or a mixture of such salts or a suitable buffer system, at a pH of about 6 to about 12, and at a temperature of about 20 to 100.degree.C.

    7.
    发明专利
    未知

    公开(公告)号：ES2061075T3

    公开(公告)日：1994-12-01

    申请号：ES90916479

    申请日：1990-11-03

    Applicant: HOECHST AG

    Inventor： SELL GUNTHER ,  SEMLER GUNTHER

    IPC: C07C315/04 ,  C07C317/14

    Abstract: PCT No. PCT/EP90/01846 Sec. 371 Date Jun. 15, 1992 Sec. 102(e) Date Jun. 15, 1992 PCT Filed Nov. 3, 1990 PCT Pub. No. WO91/07384 PCT Pub. Date May 30, 1991.Process for the preparation of alkyl 3-chlorophenyl sulfones of the formula (I), in which R1 and R2 are straight-chain or branched alkyl (C1-C4) groups, which can be identical or different, by reacting alkyl phenyl sulfones of the formula (II), in which R1 and R2 have the meanings given above, with chlorine in sulfuric acid or fuming sulfuric acid at temperatures of about 20 to about 180 DEG C.

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