1: methanol; diethyl ether / 12 h / 0 °C 2: BF3*O(C2H5)2 / CHCl3 / 36 h / Ambient temperature 3: H2 / Raney nickel / ethanol / 9 h / Heating 4: 95 percent / lithium aluminium hydride / tetrahydrofuran / 1.) -10 deg C to room temperature, 1 h, 2.) room temperature, 4 h View Scheme

1: methanol; diethyl ether / 12 h / 0 °C 2: BF3*O(C2H5)2 / CHCl3 / 36 h / Ambient temperature 3: H2 / Raney nickel / ethanol / 9 h / Heating View Scheme