Process for the preparation of N,O-disubstituted urethanes useful for the preparation of isocyanates

US4430505A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

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

Key dates

• Filing date: Oct 15, 1980
• Grant date: Feb 7, 1984
• Expiry date: Oct 15, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C271/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A process for the preparation of N,O-disubstituted urethanes. Urea or polyurets, primary amines and alcohols are reacted at 120.degree.-350.degree. C. in the presence of N-substituted urethanes and/or N-mono- or N,N'-disubstituted ureas or polyureas. In a preferred embodiment, the reactants further include catalysts known to be useful in esterification of carboxylic acids. The urethanes produced in accordance with this process are particularly useful as starting materials for preparation of isocyanates.