公开(公告)号：DE58902026D1

公开(公告)日：1992-09-17

申请号：DE58902026

申请日：1989-04-29

Applicant: BASF AG

Inventor： FISHER KLAUS DR ,  RUEB LOTHAR DR ,  PLATH PETER DR

IPC: B01J25/02 ,  B01J27/02 ,  B01J27/06 ,  B01J27/14 ,  B01J31/02 ,  C07B61/00 ,  C07D209/48 ,  C07D317/16 ,  C07D317/28 ,  C07D319/06 ,  C07D321/00 ,  C07D325/00

Abstract: 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.