triethylamine in acetonitrile 0.5 h; Heating / reflux;

1: With n-butyllithium in tetrahydrofuran T=-78°C; 0.75 h; 2: With 1,2,2-trichloro-1,1,2-trichloro-ethane in tetrahydrofuran T=-78 - 15°C; 1.41667 h; 3: With sodium methylate in methanol T=20°C; 0.75 h;