in N-dodecane high vac. or inert atmosphere; thermolysis (160°C, 16 h); not isolated, detected by (11)B-NMR spectroscopy;

&nbsp;<b>in</b>&nbsp; neat (no solvent)<br />&nbsp;high vac. or inert atmosphere; condensation of B-compd. and P-compd. into a flask, slow warming of the mixt. to room temp. in the sealed flask with vigorous shaking; elem. anal.;&nbsp;<br /> &nbsp;