Process for preparing substituted phthalic anhydrides

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

1984-04-16

1985-12-17

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549243, 549245, 549246, C07D30789

Patent

active

045594058

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. Typical acid acceptors include dimethylformamide and pyridine.

REFERENCES:
patent: 2097854 (1937-11-01), Dilthey
patent: 2264429 (1941-12-01), Bergmann
patent: 2391226 (1945-12-01), Clifford et al.
Craig, JACS, vol. 72, (1950), pp. 3732 and 3733.
Newman et al., JACS, vol. 63, (1941), pp. 1542-1544.
Izv. Akad. Nauk SSSR, Ser Khim, vol. 6, (1973), p. 1315.

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