tetrakis(triphenylphosphine) palladium(0) in tetrahydrofuran Yields of byproduct given;

n-butyllithium in tetrahydrofuran; hexane to stirred soln. of allene in THF added soln. of BuLi in hexane at -60 °C under N2, stirred at -60 °C for 1 h, added ZnCl2 at -60°C; not isolated;