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    AROMATIC BISMALEIMIDO COMPOUNDS AND PROCESS FOR THEIR PREPARATION
    95.
    发明专利
    AROMATIC BISMALEIMIDO COMPOUNDS AND PROCESS FOR THEIR PREPARATION 未知

    公开(公告)号：AU6736687A

    公开(公告)日：1987-07-15

    申请号：AU6736687

    申请日：1986-12-18

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YOSHIKAWA YUKIHIRO ,  YAMAZAKI MIDORI ,  YAMAGUCHI KEIZABURO ,  SUGIMOTO KENICHI ,  TANABE YOSHIMITSU ,  YAMAGUCHI AKIHIRO

    IPC: C07D207/452 ,  C07D207/44

    Abstract: Aromatic bismaleimides of formula (I) are new: where X is one of the groups (III) to (VI); R1 to R4 are H or methyl: (a) reaction of a diol of fromula HO-X-OH with 1.5-4.0 moles of m-dinitrobenzene in a polar aprotic solvent in the presence of 1.5-3 moles of an alkali metal (bi)carbonate, followed by hydrogenation over Pd in an organic solvent at 20-100 deg. C gives a diamine of formula (II): (b) the diamine (II) is reacted with 2-5 moles of maleic anhydride in an organic solvent (pref. an aliphatic ketone) at 0-120 deg. C to give a bismaleamic acid, which is cyclised with acetic anhydride (at least 2 moles) in an organic solvent in the presnece of an alkali acetate or tertiary amine and of a catalyst (0.05-1.1 moles= which is a phosphate, acetate, oxide, sulphate or carbonate of an alkaline earth metal, Fe(II), Fe(III), Ni(II), Mn(II), Mn(III), Cu(I), Cu(II), Co(II) or Co(III) (esp. Ni(OAc)2, Co(OAc)2 or MgO) at 20-80 deg. C.

    Benzophenone derivs. prepn.
    97.
    发明专利
    Benzophenone derivs. prepn. 未知

    公开(公告)号：IT1153743B

    公开(公告)日：1987-01-14

    申请号：IT2335982

    申请日：1982-09-21

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YAMAGUCHI AKIHIRO ,  YAMAGUCHI KEIZABURO ,  SUGIMOTO KENICHI ,  TANABE YOSHIMITSU

    IPC: C07C20060101 ,  C07C

    Abstract: Prodn. of benzophenone or its deriv. Ar-CO-Ar (II) comprises treating 1,1-bis(aryl)-2,2,2 trichloroethanol (Ar)2C(OH)(CCl3) (I) with alkali. (Ar is phenyl opt. substd. with halogen, alkyl, alkoxy, phenoxy etc.). Benzophenone or its derivs. are useful as material or intermediate for various pharmaceuticals, agrochemicals, dye stuffs and synthetic resins. Prior art required large amts. of AlCl3, chromic acid, and the like catalyst or oxidising agent which often causes corrosion and pollution problems. This process eliminates such defects.

    PROCESS FOR THE PREPARATION OF 4- CHLOROBENZENESULFONYL CHLORIDE
    100.
    发明专利
    PROCESS FOR THE PREPARATION OF 4- CHLOROBENZENESULFONYL CHLORIDE 未知

    公开(公告)号：CA1205491A

    公开(公告)日：1986-06-03

    申请号：CA422389

    申请日：1983-02-25

    Applicant: MITSUI TOATSU CHEMICALS

    Inventor： YAMAGUCHI AKIHIRO ,  YAMAGUCHI KEIZABURO ,  SUGIMOTO KENICHI ,  TANABE YOSHIMITSU

    IPC: C07C143/70 ,  C07C147/06

    Abstract: SPECIFICATION Title of the Invention Process for the Preparation of 4-Chlorobenzenesulfonyl Chloride A process for the preparation of 4-chloro-benzenesulfonyl chloride wherein chlorobenzene is reacted with chlorosulfonic acid in a halogenated aliphatic hydrocarbon in the presence of an alkali metal salt of a mineral acid and/or an ammonium salt of a mineral acid. After washing the resulting reaction mixture with water and separating the halogenated aliphatic hydrocarbon layer, water is distilled off, together with -the halogenated aliphatic hydrocarbon to obtain 4-chlorobenzenesulfonyl chloride in an anhydrous state. The anhydrous 4-chlorobenzene-sulfonyl chloride thus obtained can be converted into 4,4'-dichlorodiphenyl sulfone by reacting it with chlorobenzene in the presence of a catalytic amount of ferric chloride.

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