PROCESS FOR THE PREPARATION OF ISOCYANIC ACID ESTERS

摘要

The invention relates to an improved method for the preparation of isocyanate esters of the general formula (I), R - (NC0)n (I) wherein n is one and R stands for a straight-chained or branched C1- 10 alkyl, benzyl, cyclohexyl, phenyl, halophenyl, methylphenyl or methoxyphenyl group, or n is two and R stands for a hexamethylene, phenylene, methylenebis(phenylene), ethylenebis(phenylene) or methylenebis(halophenylene) group, from the respective amines of the general formula (II), R - (NH2)n wherein R and n are as defined above. According to the invention an amine of the general formula (II) is reacted with a compound of the general formula (III), R'-O-C0-R1 (III) wherein R' stands for chloromethyl, dichloromethyl or trichloromethyl group. If desired; two compounds of the general formula (II) and/or two compounds of the general formula (III) can be introduced simultaneously into the reaction. If desired, the reaction is performed in the presence of phosgene. The reactants utilized according to the invention are easy to handle, and the required end-products can be obtained with high yields.