1: 1.) n-BuLi / 1.) THF, hexane, -10 deg C, 3,5 h, 2.) THF, hexane, -10 deg C, 4 h 2: 87 percent / Raney nickel / 5 h / Heating View Scheme

1: 1.) n-BuLi / 1.) THF, hexane, -10 deg C, 3,5 h, 2.) THF, hexane, -10 deg C, 4 h 2: 87 percent / Raney nickel / 5 h / Heating 3: p-toluenesulfonic acid / methanol / 8 h / Ambient temperature View Scheme

boron trifluoride diethyl etherate in chloroform 1.) -20 deg C, then room temp., 1 h, .) -20 deg C, then room temp., 3.5 h;