Dianhydrides from catalyzed reaction of monoanhydide monoacid ha

Details Dianhydrides from catalyzed reaction of monoanhydide monoacid ha Dianhydrides from catalyzed reaction of monoanhydide monoacid ha

1991-11-15

1993-03-30

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549241, C07D30780

Patent

active

051985551

ABSTRACT:
The invention relates to the preparation of novel dianhydrides of the formula: ##STR1## wherein R is a polyalkylated mononuclear aromatic radical, preferably a phenylene radical. The mononuclear aromatic radical may be substituted with from three to four lower alkyl radicals, preferably C.sub.1 -C.sub.4 alkyl radicals. The dianhydrides are preferably made by the reaction of a monoanhydride monoacid halide and a polyalkylated mononuclear aromatic in the presence of a Friedel-Crafts catalyst under Friedel-Crafts reaction conditions. These dianhydrides ae useful reactants in the preparation of polyimides and epoxy curing agents.

REFERENCES:
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patent: 4937317 (1990-06-01), Pratt et al.
patent: 5023390 (1991-06-01), Abe et al.
patent: 5077415 (1991-12-01), Jasne et al.
Eliel, Stereochemistry of Carbon Compounds, 1962, p. 173.

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