Process for separating mixtures of nitrobenzaldehyde isomers

US5567854A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Wolfram Kissener · Neunkirchen, DE
• Herbert Emde · Cologne, DE
• Achim Fessenbecker · Ludwigshafen, DE

Key dates

• Filing date: Sep 22, 1995
• Grant date: Oct 22, 1996
• Expiry date: Sep 22, 2015

Classification

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

Abstract

2- and 3-Nitrobenzaldehydes suitable for use as intermediates for the preparation of pharmaceuticals are obtained in a simple manner and without risk of uncontrolled decompositions by distilling mixtures of nitrobenzaldehyde isomers at bottom temperatures of at most 200.degree. C. in the presence of monomeric and/or polymeric aromatic amines and/or phenols and/or N- and S-containing phenothiazines.