in diethyl ether byproducts: NaCl; dropping soln. of 38 mmol ClB(C2H5)2 in 20 ml diethyl ether to soln. of 37 mmol Na-salt in 40 ml diethyl ether within 20 min under Ar, rise in temp., reflux; refluxing for 4 h;; filtration; complete removal of solvent in vac. at <=40°C; distn. in vac.; product mixt. obtained; (11)B NMR spectroscopy; b. p.;;
