in hexane under N2, addn. of B-compd. in hexane to Li-compd. in hexane at -60°C with stirring, allowed to attain ambient temp.; insoluble material removed, hexane removed, fractional distn.;

in hexane under N2, addn. of B-compd. in hexane to Li-compd. in hexane at -60°C with stirring, allowed to attain ambient temp.; insoluble material removed, hexane removed, fractional distn.;