... SONOCHEMICAL BARBIER REACTION WITH ISOCYANATES AND THE SYNTHETIC USE OF THE ORGANOMETALLIC INTERMEDIATE J. EINHORN and JL LUCHE Laboratoire dtudes ... H20 Mst& I Ar NJ -~ Ar C NHR Ar +R-NC=O ~ L (~ M4 J 1 ~ (I) The reaction of Broinobenzene and tutyl isocyanate in the presence of several metals was chosen as a mode1.~Br (1 equiv.) and tuNCO (1.2 equiv.) were sonicated in diethylther or tetrahydrofuran in a ...