1: 46 percent / Faigl mix / hexane; tetrahydrofuran / 2 h / -100 °C 2: 91 percent / potassium fluoride / tetrahydrofuran; H2O / 12 h / Heating 3: 88 percent / diisopropylamine; butyllithium / hexane; tetrahydrofuran / 2 h 4: 92 percent / butyllithium; butylmagnesium chloride / tetrahydrofuran; hexane; toluene / 0.75 h / 0 °C View Scheme

1: 52 percent / butyllithium; 2,2,6,6-tetramethylpiperidine; N,N',N',N",N"-(pentamethyl)diethylenetriamine / potassium tert-butoxide / tetrahydrofuran; hexane / 2 h / -100 °C 2: 90 percent / potassium hydroxide / methanol; H2O / 2 h / Heating View Scheme

1: 46 percent / Faigl mix / hexane; tetrahydrofuran / 2 h / -100 °C 2: 91 percent / potassium fluoride / tetrahydrofuran; H2O / 12 h / Heating 3: 88 percent / diisopropylamine; butyllithium / hexane; tetrahydrofuran / 2 h View Scheme

1: 46 percent / Faigl mix / hexane; tetrahydrofuran / 2 h / -100 °C 2: 91 percent / potassium fluoride / tetrahydrofuran; H2O / 12 h / Heating View Scheme

2,2,6,6-tetramethyl-piperidine; n-butyllithium in tetrahydrofuran; hexane T=-75°C;

N,N,N',N'',N''-pentamethyldiethylenetriamine; potassium tert-butylate; 2,2,6,6-tetramethylpiperidinyl-lithium in tetrahydrofuran; hexane T=-100°C;

Faigl mix in tetrahydrofuran; hexane T=-100°C; 2 h;