in chloroform-d1 under N2, with exclusion of moisture, condensation of reagents in 1.14/0.55 mmol ratio, gently warmed to room temp.; not sepd.; detected by NMR, IR;
under N2, with exclusion of moisture, reagents in 8/4.4 mmol ratio, condensed at -196°C, gently warmed to room temp. for 15 min; BCl3 sepd. by distn.; elem. anal.;
