Cs/Na/K alloy 1) NH3, -75 deg C, 2 h, 2) H2O; Yield given. Multistep reaction;

1: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.0833333 h; 2: With 2,2,6,6-tetramethyl-piperidine; potassium tert-butylate in tetrahydrofuran; hexane T=-78 - -60°C; 0.5 h; 3: With ethylene dibromide in tetrahydrofuran; hexane T=-60 - 20°C; regioselective reaction;

Stage #1: With  n-butyllithium in  tetrahydrofuran; hexane T=-78°C; 0.0833333 h; Stage #2: With  2,2,6,6-tetramethyl-piperidine; potassium tert-butylate in  tetrahydrofuran; hexane T=-78°C; 0.25 h; Stage #3: With  ethylene dibromide in  tetrahydrofuran; hexane T=-78°C; 0.0833333 h;  regioselective reaction;