in pentane byproducts: LiCl; Schlenk techniques; B-compd. soln. addn. (syringe) to stirred org. compd. suspn. at -78°C, mixt. stirring (12 h, warming to 25°C), Li-salt ppt. filtration off, filtrate evapn.; residue recrystn. (pentane, -30°C), sublimation; elem. anal.;

in toluene

in toluene under N2; soln. of PhBCl2 (0.5 equiv) in toluene added dropwise to soln.of (Cu(C6F5))4(η2-toluene)2 in toluene at -78 °C; mixt. stir red at -78 °C for 1 h, allowed to slowly warm to room temp., and stirred for addnl. 12 h; react. mixt. filtered through fritted glass disk and washed twice with toluene; all volatiles removed under vac.; crude product purified by crystn. from hexanes at -37 °C;