Process for the preparation of oxydiphthalic anhydride and...

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

C - Chemistry, Metallurgy

07

D

C07D 307/89 (2006.01) C07C 51/567 (2006.01) C07C 65/24 (2006.01)

Patent

CA 2044110

CASE 5845/6128 JHE/kmf ABSTRACT OF THE INVENTION PROCESS FOR THE PREPARATION OF OXYDIPHTHALIC ANHYDRIDE AND ACYLOCYPHTHALIC ANHYDRIDES 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.

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