Process for the preparation of n,o- disubstituted urethanes...

Details Process for the preparation of n,o- disubstituted urethanes... Process for the preparation of n,o- disubstituted urethanes...

C - Chemistry, Metallurgy

07

C

260/468, 260/386

C07C 271/06 (2006.01)

Patent

CA 1144564

Mo-2173 LeA 19,986 PROCESS FOR THE PREPARATION OF N,O-DISUBSTITUTED URETHANES USEFUL FOR THE PREPARATION OF ISOCYANATES ABSTRACT OF THE DISCLOSURE A process for the preparation of N,O-disubstituted urethanes. Urea or polyurets, primary amines and alcohols are reacted at 120-350°C in the presence of N-substituted urethanes and/or N-mono- or N,N'- disubstituted ureas or polyureas. In a preferred embodi- ment, 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 prepara- tion of isocyanates. LeA 19,986

362932

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