water; lithium in tetrahydrofuran under N2; addn. of Li wire to a suspn. of ClPbPh3 in THF at room temp.;stirring for 15 h; filtration; addn. of ttt-3-Br-CDT in THF to the cooled (0°C) black soln.; stirring at room temp. for 50 h; addn. of H2O;; extg. (ether, 3 times); washing (water); drying (MgSO4); evapn. of solvent; dissolving (acetone); filtration from (C6H5)4Pb; evapn. of solvent (vac.); dissolving of the light yellow oil in boiling ethanol; crystn. on cooling (ice-box); elem. anal.;;

in tetrahydrofuran; hexane T=-100°C; 1 h;

lithium in tetrahydrofuran 5 h; HeatingBr-Li exchange; Product distribution;

lithium in tetrahydrofuran 5 h; HeatingBr-Li exchange; Product distribution;