in diethyl ether under N2, equimolar amt. of t-BuLi was added slowly to stirred soln. of(Me3Si)2NBCl2 in Et2O at 0°C, warmed to room temp. with stirring; filtered, solvent removed, distd.; elem. anal.;

tert.-butyl lithium in pentane React. of B-compd. with pentane soln. of t-BuLi.;

in hexane NH3 is allowed to bubble through a stirred hexane soln. of B-compd. at -78°C under dry N2 or vac. Stirring of mixt. for a few hours, after warming to room temp.; Filtn. and removal of solvent affords liq. Elem. anal.;

in neat (no solvent) thermal decompn. of t-BuBClN(SiMe3)2 at 575°C and 0.005 Torr; products condensed at -196°C and dissolved in toluene-d8; detected by (1)H, (11)B NMR and IR spectroscopy;