in dichloromethane (inert atmosphere); -60°C to room temp. over 12 h; not obtained pure, NMR assignment;

in dichloromethane (inert atmosphere); -78°C to room temp.; solvent removal (vac.), condensing the 2 byproducts into a cooled trap, crystn. from CH2Cl2 at -20°C after 2 d, drying (vac.); elem. anal.;

in dichloromethane (inert atmosphere); -78°C to room temp.; not obtained pure, NMR assignment;

in toluene 90°C for 12 h; solvents evapd., recrystd. from hexane, elem.anal.;

in dichloromethane (inert atmosphere); addn. of the Sn-N compound in CH2Cl2 at -30°Cto Me2SnBr2 in CH2Cl2, a 2nd portion was added at -60°C, slow wa rming to room temp. within 12 h; condensing the solvent into a cooled trap in vacuo, distn. of the byproduct in vacuo, addn. of pentane, removal of pentane (vac.), distn. of more byproduct by distn. (vac.), recrystn. (CH2Cl2); elem. anal.;

in dichloromethane (inert atmosphere); addn. of the Sn-N compound in CH2Cl2 at -30°C, a 2nd portion at -60°C to (D6)Me2SnBr2 in CH2Cl2, slow warming to room temp. within 12 h; condensing the volatiles into a cooled trap in vacuo, removal of CH2Cl2 and Me3SnBr by distn. in vacuo, treatment of the residue with CH2Cl2, crystn. at -20°C; elem. anal.;

in dichloromethane N2 atmosphere, addn. of soln. of Me2BBr to soln. of Sn compd. (-78 to -60°C, 2 h), warming to room temp., stirring (room temp., 1 h), addn. of Me2SnCl2 soln. (room temp., 45 min), redn. of volume, addn. to soln. of tBuBBr2 (-78°C, 90 min); warming to room temp., stirring (room temp., 4 d), removement of volatiles (25°C, 12 Torr/1E-3 Torr), pptn. (Me2SnBr2, petroleum ether, -30°C), filtration, removement of volatiles (0°C, 12 Torr/1E-3 Torr), distn.; elem. anal;

in dichloromethane (inert atmosphere); -30°C; solvent removal (vac.), removal of Me3SnBr by vac.-distn. and condensation into a cooled trap applying high vac., crystn. from CH2Cl2 at -30°C after 12 h; elem. anal.;

in dichloromethane N2 atmosphere, addn. of soln. of borane to soln. of stannyl compound at -78 to -60°C (2 h), warming to room temp., stirring (room temp., 1 h); spectroscopic yield 100percent, not isolated;

in dichloromethane (inert atmosphere); -60°C to room temp.; solvent removal (vac., -30°C)), removal of byproducts by vac.-distn.;