1: 33 percent / butyllithium / tetrahydrofuran; hexane / -15 - -10 °C 2: 16 percent / butyllithium / tetrahydrofuran; hexane / -15 - -10 °C 3: 70 percent / Raney nickel / cyclohexane / 2 h / Heating View Scheme

1: 50 percent / butyllithium / tetrahydrofuran; hexane / -15 - -10 °C 2: 40 percent / butyllithium / tetrahydrofuran; hexane / -15 - -10 °C 3: 79 percent / Raney nickel / cyclohexane / 2 h / Heating View Scheme

1: 67 percent / butyllithium / tetrahydrofuran; hexane / 12 h / -10 °C 2: 38 percent / Raney nickel / cyclohexane / 2 h / Heating View Scheme