HCl in diethyl ether byproducts: KCl, CH3CHC(C2H5)(Si(CH3)2OSi(CH3)2); (Ar); added dropwise a soln. of B-compound to soln. of HCl in ether; refluxed for 4 h; filtrated; evapd. (vac.); distd. (vac.);

in tetrahydrofuran byproducts: KCl; (Ar); added rapidly a soln. of B-compound to soln. of Pb-compound; refluxed for 6 h; filtered; evapd. (vac.); distd. (vac.); GC;