Process for the preparation of 2-nitrobenzaldehydes

US5576463A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Albert Schnatterer · Leverkusen, DE
• Helmut Fiege · Leverkusen, DE

Key dates

• Filing date: Mar 3, 1995
• Grant date: Nov 19, 1996
• Expiry date: Mar 3, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C201/12
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The new process for the preparation of 2-nitrobenzaldehydes of the general formula ##STR1## in which X.sub.1 and X.sub.2 either independently of one another represent hydrogen or halogen or one of the substituents represents nitro and the other substituent then represents hydrogen, PA1 by oxidation of 2-nitrotoluenes of the general formula ##STR2## in which X.sub.1 and X.sub.2 have the meaning indicated above is characterized in that the oxidation with oxygen or an oxygen-containing gas is carried out in the presence of at least one alkoxyalkylamine as a solvent and in the presence of strong bases.