PROCESS FOR PREPARING ISOCYANATES FROM URETHANES BY A NOVEL TECHNIQUE

摘要

Urethanes are converted to isocyanates by reaction with a chloro-, bromo- or iodo- borane compound and a tertiary amine in a nonpolar solvent. With the preferred borane compound, chlorocatecholborane, the reaction goes speedily and under gentle conditions to give the isocyanate in good yield. Also formed is a borate which can be readily converted to the borane compound, for reuse.