Process for the preparation of oxydiphthalic anhydride and acylo

Details Process for the preparation of oxydiphthalic anhydride and acylo Process for the preparation of oxydiphthalic anhydride and acylo

1991-11-12

1992-10-06

Tsang, Cecilia

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549241, C07D30789

Patent

active

051533359

ABSTRACT:
A method for the preparation of acyloxyphthalic anhydride or oxydiphthalic anhydride which comprises the reaction of a halophthalic anhydride with an alkali metal salt and at least a catalytically effective amount of an acid or acid derivative selected from the group consisting of benzoic acids, substituted benzoic acids, benzoic acid salts or substituted benzoic acid salts, and hydrolyzable benzoyl esters, and hydrolyzable substituted benzoyl esters, alkyl carboxylic acids, hydrolyzable esters of alkyl carboxylic acids, and salts of alkyl carboxylic acids. The process may be conducted without solvent, in a polar solvent or in a non-polar solvent using a phase transfer catalyst.

REFERENCES:
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patent: 4952721 (1990-08-01), Fjare
patent: 5003031 (1991-03-01), Schwartz et al.
patent: 5003086 (1991-03-01), Stults et al.
Sato et al, Chem. Abst. 113-2128204u (1990).
Von H. Muhlemann, Pharm. Acta. Helv. p. 257 (1948).

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