Abstract
The reaction of trichloroacetanilide in alkaline medium was followed by means of infrared spectroscopy. Several intermediates and reaction products have been proved: the N-anion of the started trichloroacetanilide, the decarboxylation products of pnenylcarbamic acid - carbon dioxide and aniline, the end-product N,N-diphenylurea. The data obtained support the presupposed reaction mechanism involving in situ generation of phenylisocyanate.