tetramethyl-ammonium fluoride in ethylene glycol dimethyl ether T=-30 - 20°C;

aluminium trichloride T=50 - 54°C; 5 h;

n-butyllithium; N,N,N',N,-tetramethylethylenediamine; water 1.) THF, hexane, r.t., 4 h, 2.) THF, hexane, 2 h, 3.) ethanol, 24 h; Yield given. Multistep reaction. Yields of byproduct given;