in tetrahydrofuran under argon, compounds were added at -78°C, stirring at this temp. for 5 min, mixt. was warmed to 25°C for 10 min and cooled to -78°C, mixt was transfered to a soln. of water in THF; solvent was removed under vacuum, resulting oil was purified by glpc, elem. anal., mass spectrum;

in tetrahydrofuran argon, added at -78°C, stirred at this temp. for 5 min, mixt was transfered to a soln. of water in THF, warmed to 25°C; solvent removed under vacuum, extracted with pentane, removal of the solvent, resulting oil was purified by glpc, elem. anal.;