Process for the preparation of N,O-disubstituted urethanes suitable as a starting material for the preparation of isocyanates

US4388238A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Heitkamper · Dormagen, DE
• Klaus Konig · Leverkusen, DE
• Rudolf Fauss · Cologne, DE
• Kurt Findeisen · Odenthal, DE

Key dates

• Filing date: Oct 15, 1980
• Grant date: Jun 14, 1983
• Expiry date: Oct 15, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/91
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of N,O-disubstituted urethanes. Primary amines and alcohols are reacted with organic compounds having carbonyl groups at 120.degree. to 350.degree. C. Suitable carbonyl-containing compounds include N-unsubstituted urethanes. N-mono-substituted, N,N'-disubstituted ureas, or polyureas may be used in combination with the N-unsubstituted urethane. The product urethanes are particularly suitable for the preparation of isocyanates.