T=-80 - 95°C; Inert atmosphere;

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 stannyl compound to soln. of borane at -78 to -70°C (80 min), slow warming to room temp., stirring (roomtemp., 20 h); removement of solvent (25°C, 13 Torr) and Me3SnBr (34°C, 1E-3 Torr), distillation (82-86°C, 1E-3 Torr and 40-41°C, 1E-5 Torr); elem. anal.;

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