Process for preparing substituted phthalic anhydrides

Details Process for preparing substituted phthalic anhydrides Process for preparing substituted phthalic anhydrides

C - Chemistry, Metallurgy

07

D

260/364.8

C07D 307/89 (2006.01) C07C 51/567 (2006.01)

Patent

CA 1226870

PROCESS FOR PREPARING SUBSTITUTED PHTHALIC ANHYDRIDES ABSTRACT OF THE DISCLOSURE 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.

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