Process for the preparation of isocyanic acid esters

Details Process for the preparation of isocyanic acid esters Process for the preparation of isocyanic acid esters

C - Chemistry, Metallurgy

07

C

260/455

C07C 118/00 (1980.01)

Patent

CA 1136641

ABSTRACT OF THE DISCLOSURE 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(phenyl- ene), 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 reac- tants utilized according to the invention are easy to handle, and the required end-products can be obtained with high yields.

351992

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