| abstract |
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 |