Process for preparing 4-substituted phthalic anhydrides
    1.
    发明公开
    Process for preparing 4-substituted phthalic anhydrides 失效
    Verfahren zur Herstellung 4-取代物Phthalsanureanhydride。

    公开(公告)号:EP0159637A1

    公开(公告)日:1985-10-30

    申请号:EP85104481.8

    申请日:1985-04-12

    CPC classification number: C07C51/567 C07C63/15

    Abstract: A process for preparing substituted phthalic anhydrides, e.g. 4-methylphthalic anhydride, in which the Diels-Alder addition product of a conjugated diene, e.g. isoprene, and maleic anhydride is reacted with bromine in the presence of an acid acceptor. The acid acceptor can be present in catalytic amounts. Typical acid acceptors include dimethylformamide and pyridine.

    Abstract translation: 取代的邻苯二甲酸酐的制备方法,例如 4-甲基邻苯二甲酸酐,其中共轭二烯的Diels-Alder加成产物,例如 异戊二烯和马来酸酐在酸受体的存在下与溴反应。 酸受体可以以催化量存在。 典型的酸受体包括二甲基甲酰胺和吡啶。

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