Patent ID: 6528663
Filing Date: 2003-03-04
Classification: C07C,C07D

Abstract:
A method for preparing a phthalic anhydride, comprising: transimidation of an N-alkyl phthalimide (V) wherein Râ€² is selected from the group consisting of halogens, aromatic groups comprising 6-18 carbons, aliphatic groups comprising 1-18 carbons, hydrogen and nitro groups, and R is an alkyl group having from 1 to 18 carbons, with substituted tetrahydrophthalic anhydride (VI) wherein Râ€³ is selected from the group consisting of halogen, aromatic groups comprising 6-18 carbons, or aliphatic group comprising 1-18 carbons, hydrogen and nitro groups, to yield a substituted N-alkyl tetrahydrophthalimide (VIl) and a phthalic anhydride (IV)