n-butyllithium; N,N,N',N,-tetramethylethylenediamine in diethyl ether; hexane 1.) 20 min, 2.) reflux, 15 min; Yield given. Yields of byproduct given;

ZnCl2*Et2O in dichloromethane T=-40°C; 1 h; other reagents; Product distribution;

zinc(II) chloride in dichloromethane 2 h; Heatingother temp.; Product distribution;