in dichloromethane (N2), tin reagent dissolved in dry CH2Cl2, treated dropwise with 1 equiv. of Rh complex in dry Ch2Cl2, stirred for 6 h at room temp.; chromy.(silica gel - toluene/acetone 2:1), washed (toluene/acetone 1:1);

in dichloromethane (N2), Ir complex in CH2Cl2 treated with solid tin reagent in one portionat room temp.;