Preparation of o-nitrobenzaldehyde

US4450297A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Michael Preiss · Leinfelden, DE
• Wolfgang Gau · Wuppertal, DE
• Horst Behre · Odenthal, DE

Key dates

• Filing date: Mar 17, 1983
• Grant date: May 22, 1984
• Expiry date: Mar 17, 2003

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/16
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

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 converting the o-nitrobenzaldehyde acetal to o-nitrobenzaldehyde.