Process for the preparation of esters of stilbenedicarbonic acid and process for the preparation of p-(chloromethyl)-benzoic acid
    3.
    发明授权
    Process for the preparation of esters of stilbenedicarbonic acid and process for the preparation of p-(chloromethyl)-benzoic acid 失效
    一种制备的二苯乙烯二羧酸和过程酯的制备对 - (氯甲基)苯甲酸过程

    公开(公告)号:EP0813515B1

    公开(公告)日:2000-06-28

    申请号:EP96906610.9

    申请日:1996-02-23

    IPC分类号: C07C67/343 C07C69/76

    CPC分类号: C07C67/343 C07C69/76

    摘要: Disclosed is a process for the preparation of 4,4'-stilbenedicarboxylate esters by a 3-step process utilizing p-toluic acid, an alkyl p-formylbenzoate and a trialkyl phosphite. The steps comprise: (1) preparing p-(chloromethyl)benzoic acid by chlorinating p-toluic acid with sulfuryl chloride in the presence of a free radical initiator and chlorobenzene or dichlorobenzene; (2) contacting the p-(chloromethyl)benzoic acid of step (1) with a trialkyl phosphite to obtain a phosphonate compound; and (3) contacting the phosphonate ester compound of step (2) with an alkyl p-formylbenzoate in the presence of an alkali metal alkoxide and an inert solvent to obtain the dialkyl 4,4'-stilbenedicarboxylate.

    PROCESS FOR THE PREPARATION OF STILBENEDICARBOXYLATE ESTERS
    4.
    发明授权
    PROCESS FOR THE PREPARATION OF STILBENEDICARBOXYLATE ESTERS 失效
    用于生产二苯乙烯酯

    公开(公告)号:EP0813516B1

    公开(公告)日:1999-12-01

    申请号:EP96908508.3

    申请日:1996-02-23

    IPC分类号: C07C67/343 C07C69/76

    CPC分类号: C07C67/343 C07C69/76

    摘要: Disclosed is a process for the preparation of 4,4'-stilbenedicarboxylate esters by a 4-step process starting with an alkyl p-formylbenzoate and utilizing intermediate phosphite and phosphonate compounds. The steps comprise: (1) preparing an alkyl p-(hydroxymethyl)benzoate by hydrogenating an alkyl p-formylbenzoate; (2) contacting the alkyl p-(hydroxymethyl)benzoate of step (1) with a trialkyl phosphite to obtain a phosphite ester compound having formula (IV); (3) contacting the phosphite ester of step (2) with a catalytic amount of iodine to rearrange the phosphite ester to the corresponding phosphonate ester; and (4) contacting the phosphonate ester compound of step (3) with an alkyl p-formylbenzoate in the presence of an alkali metal alkoxide and an inert solvent to obtain the dialkyl 4,4'-stilbenedicarboxylate.