in chloroform N2 atmosphere, reflux (2 d);

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of borane at -70 to -60°C (1 h) with stirring, slow warming to room temp., stirring (room temp., 20 h); removement of solvent (25°C, 13 Torr), sublimation of Me3SnCl (25°C, 1E-3 Torr), cryst. (CH2Cl2); elem. anal.;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of Me2SnCl2, addn. to soln. of (C6H2(CH3)3)BCl2 at -50°C (90 min) with stirring, cooling to -50°C, addn. of soln. of MeBBr2 (90 min), stirring (room temp., 2 d); removement of volatiles (25°C, 12 Torr/1E-6 Torr), removement of organotin halides (25-55°C, 1E-6 Torr), distillation (87-88°C, 1E-6 Torr); elem. anal.;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of borane at -70 to -60°C (60 min) with stirring, slow warming to room temp., stirring (room temp., 17 h); removement of volatiles (25-40°C, 12 Torr to 1E-5 Torr), NMR-monitoring, not isolated;

in dichloromethane N2 atmosphere, addn. of soln. of stannyl compound to soln. of Me2SnCl2 at room temp., addn. to soln. of (C6H2(CH3)3)BCl2 at -68 to -40°C (110 min), warming to room temp., reflux (2 d); other reaction time and temperature; not isolated, PhN(C6H2(CH3)3)(SnMe2Cl)/Me3SnCl ratio 1:2;

in dichloromethane; toluene N2 atmosphere, addn. of soln. of stannyl compound to soln. of Me2SnCl2 at room temp., addn. to soln. of (C6H2(CH3)3)BCl2 at -68 to -40°C (110 min), warming to room temp., reflux (2 d); removement of solvent (25°C, 12 Torr), dissolution (toluene), reflux (14 d), not separated, PhN(BCl(C6H2(CH3)3))2/(PhN(BCl(C6H2(CH3)3))(SnMe2Cl),(PhNB(C6H2(CH3)3)3))2 ratio 1:2;

in toluene T=100°C; 36 h;

in toluene byproducts: dimesitylene; under N2; soln. of MesBCl2 (1.0 equiv) in toluene added to soln. of (CuMes)5*toluene in toluene at room temp.; mixt. heated to 100 °C for36 h; after filtration all volatiles removed first at room temp and then at 100 °C under high vac.; residue purified by recrystn. from hexanes at -37 °C; elem. anal.;

in toluene byproducts: dimesitylene; under N2; soln. of MesBCl2 (1.0 equiv) in toluene added to soln. of (CuMes)5*toluene in toluene at room temp.; mixt. heated to 100 °C for36 h; after filtration all volatiles removed first at room temp and then at 100 °C under high vac.; residue purified by recrystn. from hexanes at -37 °C; elem. anal.;