nBuLi in diethyl ether; hexane nBuLi was added to stirred soln. of ligand in Et2O at -78°C, stirred for 2 h, added dropwise to hexane soln. of Sn-compound at -78°C, stirred for 2 h under Ar; solvent was evapd. in vacuo, dissolved in CHCl3, filtered, concd., layered with pentane, crystd.; elem. anal.;

in hexane byproducts: C4H10; (Ar); std. Schlenk technique; Ph3SnOH (1 equiv.) was added to soln. of Al compd. (1 equiv.) in hexane; suspn. was stirred at room temp. for 24 h; exposed to air for 12 h; filtered; evapd. (vac.); elem. anal.;