1: With n-butyllithium in ethylene glycol dimethyl ether T=-40°C; 16 h; 2: With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in ethylene glycol dimethyl ether T=-78 - 0°C; 3: With ethylene dibromide in ethylene glycol dimethyl ether T=-78 - 0°C;