n-butyllithium 1.) hexanes, ether, -70 deg C, 0.5 h, 2.) hexanes, ether, a) -70 deg C, 0.5 h, b) from -70 deg C to O deg C, 2 h; Yield given. Multistep reaction;

in tetrahydrofuran; diethyl ether

in diethyl ether; hexane