t-BuLi in hexane; pentane addn. of t-BuLi in pentane at -100°C over 15 min to tropidine in pentane, further reacting at -80°C for 3 d, recooling to -100°C, addn. of Me3SnCl in hexane over 15 min, warming to room temp. over 1 h, stirring (30 min), add. of H2O; extn. (pentane), washing (brine), drying (Na2SO4), removal of solvents (reduced pressure), distn. (50°C/3E-3 Torr);

in n-heptane (N2); dropwise addn. of a soln. of tin compd. in heptane to a slurry of lithium compd. in heptane at -100°C, warming to room temp., stirring for 2.5 h; addn. of water, stirring overnight, extn. with heptane/pentane, washing with brine, drying (MgSO4), filtration, passing through alumina column, distn.;

in toluene Mn compd. suspended in toluene, Sn compd added dropwise, heated at 80°C for 48 h; cooled, toluene evapd. under vac., residue extd. with hexane, concd., column chromy. (Al2O3, hexane), eluate dried over MgSO4, filtered, filtrate evapd. under vac; elem. anal.;