1-bromo-butane; water in tetrahydrofuran byproducts: all-trans-1,5,9-cyclododecatriene; N2 atmosphere; addn. of PhLi to the triphenylplumbyl compd. in THF at -65°C; stirring at -65°C for 0.5 h; addn. of 1-bromobutane to the light yellow soln.; warming to room temp.; hydrolysis with water;; extg. (ether); washing (water); drying; evapn. of solvent; dissolution in acetone; filtration of Pb(C6H5)4;;

phenyllithium in diethyl ether; benzene T=-65°C; 0.5 h;