Preparation of o-nitrobenzaldehyde (US Patent 4450297)

Patent number: 4450297 Granted: 1984-05-22 Filed: 1983-03-17 Inventors: Michael Preiss (Wuppertal, DE); Wolfgang Gau (Wuppertal, DE); Horst Behre (Odenthal, DE) Assignees: Bayer Aktiengesellschaft (Leverkusen, DE)

Abstract

A process for the preparation of o-nitrobenzaldehyde, comprising converting to the corresponding acetals a mixture of nitrated benzaldehyde which contains about 10 to 30% of o-nitrobenzaldehyde and about 70 to 90% of m-nitrobenzaldehyde, removing the o-nitrobenzaldehyde acetal by distillation, and then