in tetrahydrofuran mixing reactants in THF at -78°C, slow warming to room temp. / further products; evapn. in vac., extn. with pentane, ether and finally acetone or CH2Cl2, concn., chromy. on Al2O3, purifn. by crystn., distn. or sublimation;

in tetrahydrofuran mixing reactants in THF at -78°C, slow warming to room temp. / further products; evapn. in vac., extn. with pentane, ether and finally acetone or CH2Cl2, concn., chromy. on Al2O3, purifn. by crystn., distn. or sublimation;

in tetrahydrofuran mixing reactants in THF at -78°C, slow warming to room temp. / further products; evapn. in vac., extn. with pentane, ether and finally acetone or CH2Cl2, concn., chromy. on Al2O3, purifn. by crystn., distn. or sublimation;

in tetrahydrofuran mixing reactants in THF at -78°C, slow warming to room temp. / further products; evapn. in vac., extn. with pentane, ether and finally acetone or CH2Cl2, concn., chromy. on Al2O3, purifn. by crystn., distn. or sublimation;