in toluene dropwise addn. of soln. of Fe(CO)5 to soln. of amine, -78°C, warming up to room temp., evapn., addn. of pentane, pptn. of Me3SnNCO, filtration, evapn. in vac., under N2; extn. with pentane, chromy. (Al2O3), evapn. in vac., elem. anal. of Me3SnNCO;

urea in neat (no solvent) fusion;

in not given exchange reaction according to: V. N. Sedel'nikova, L. M. Terman, Yu. B. Krupennikov, Vysokomol. Soed. B16 (1974) 264;