in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of borane at -78°C (60 min), slow warming to room temp., stirring (25°C, 12 h); removement of solvent (25°C, 12 Torr), removement of Me3SnBr (30°C, 1E-2 Torr or 53-55°C, 12 Torr); elem. anal.;

in dichloromethane N2 atmosphere, addn. of soln. of borane to soln. of stannyl compound at -75°C (60 min), slow warming to room temp., stirring (25°C, 12 h); removement of solvent (25°C, 12 Torr), removement of Me3SnBr (30°C, 1E-2 Torr or 53-55°C, 12 Torr);

in benzene N2-atmosphere; stirring equimolar amts. for 2 h; decantation, evapn. (vac.);

in dichloromethane T=25°C; Substitution; 12 h;

in dichloromethane N2 atmosphere, addn. of soln. of borane to soln. of stannyl compound at -75°C (60 min), slow warming to room temp., stirring (25°C, 12 h); removement of solvent (25°C, 12 Torr), removement of Me3SnBr (30°C, 1E-2 Torr or 53-55°C, 12 Torr);