A method for the preparation of bis (ethoxy carbonyl, amino) toluenes and their use for the preparation of diisocyanate (cyanato toluenes

摘要

a method for producing bis (ethoxycarbonylamino) toluolen through implementation of diaminotoluolen with diethylcarbonat in the presence of a catalyst in the 100 to 300, while subsequent distillative removal of the formed or alcoholwith the diethylcarbonat in at least 5 times molar excess relative to the amine groups of the diaminotoluols used and the educated to (ethoxycarbonylamino) should, after cooling of the reaktionsgemischs in form of the crystals of high purity from isolatedand the use of the thus obtained to (ethoxycarbonylamino) should as a raw material in the manufacture of diisocyanatotoluolen.