in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of borane at -65 to -75°C (30 min), slow warming to room temp., stirring (roomtemp., 16 h); (5)B-NMR-monitoring, PhN(BBrMe)2/Me2BBr/(PhNBMe)3 ratio 12.5:1.5:0.6, not isolated;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of borane at -65 to -75°C (30 min), slow warming to room temp., stirring (25°C); (5)B-NMR-monitoring, PhN(BBrMe)2/Me2BBr/PhN(SnMe3)(BMeBr)/(PhNBMe)3 ratio 10.5:1.5:1.5:0.7, not isolated;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to suspension of Me2SnBr2 at room temp., addn. of soln. of tBuBBr2 at -68 to -40°C (130min), warming to room temp.; removement of solvent (25°C, 12 Torr), condensation of Me3SnBr and Me2SnBr2 into a trap (-78°C, 4 h), fractional distillation (69-77°C, 1E-5 Torr); elem. anal.;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to suspension of Me2SnCl2 at room temp., addn. of soln. of tBuBBr2 at -50°C (1.5 h), warming to room temp. (1.5 h), stirring (25°C, 96 h), reflux (48 h); removement of solvent (25°C, 12 Torr), condensation of Me3SnBr and Me2SnClBr in a trap (-78°C), distillation (48-51°C, 1E-5Torr), spectroscopic yields: (PhNBtBu)3 20percent; PhN(BtBuCl)2 80percent; elem. an al.;

in dichloromethane N2 atmosphere, addn. of soln. of borane to soln. of stannyl compound at -78°C (15 min), slow warming to room temp., stirring (room temp.,3 d); (5)B-NMR-monitoring, PhN(SnMe3)(BtBuBr)/tBu(Me)BBr ratio 2:3, not isolated;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of borane at -65 to -75°C (30 min), slow warming to room temp., stirring (roomtemp., 16 h); (5)B-NMR-monitoring, PhN(BBrMe)2/Me2BBr/(PhNBMe)3 ratio 12.5:1.5:0.6, not isolated;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to suspension of Me2SnCl2 at room temp., addn. of soln. of tBuBBr2 at -50°C (1.5 h), warming to room temp. (1.5 h), stirring (25°C, 96 h), reflux (34 h); NMR-monitoring, not isolated, spectroscopic yields: PhN(BtBuCl)(Sn(Me2Cl) 35percent; tBuBClBr 29percent; PhN(BtBuCl)2 35percent;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of borane at -65 to -75°C (30 min), slow warming to room temp., stirring (25°C); (5)B-NMR-monitoring, PhN(BBrMe)2/Me2BBr/PhN(SnMe3)(BMeBr)/(PhNBMe)3 ratio 10.5:1.5:1.5:0.7, not isolated;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to suspension of Me2SnCl2 at room temp., addn. of soln. of tBuBBr2 at -50°C (1.5 h), warming to room temp. (1.5 h), stirring (room temp., 3 h); other reaction time; NMR-monitoring, not isolated, spectroscopic yields: PhN(BtBuCl)(Sn(Me2Cl) 50percent; tBuBClBr 50percent;

tC4H9BBr2 in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to suspension of Me2SnCl2 at room temp., addn. of soln. of tBuBBr2 at -50°C (1.5 h), warming to room temp. (1.5 h); NMR-monitoring, not isolated, Me3SnCl spectroscopic yield 100percent;