1.1: 97 percent / Raney nickel / ethanol / 18 h / 25 °C 2.1: Red-Al / toluene / 1.5 h / 25 °C 2.2: 82 percent / air; conc. HCl / ethanol / 18 h / 25 °C View Scheme

nickel in ethanol T=25°C; 18 h;