PRODUCTION OF 3-(3, 4, 5, 6- TETRAHYDROPHTHALIMIDE)-BENZALDEHYDE

摘要

3-(3,4,5,6-Tetrahydrophthalimido)-benzaldehydes of the type I I or corresponding derivatives substituted in the phenyl ring are prepared by (a) acetalization of a 3-nitrobenzaldehyde III or of a corresponding derivative with an alcohol IV in the presence of an acidic catalyst to give the corresponding cyclic acetal V V (b) reduction of the cyclic acetal V with hydrogen to give the corresponding amino compound II and (c) subsequent condensation of this aminophenyl acetal II with 3,4,5,6-tetrahydrophthalic anhydride in an acidic reaction medium.