1: 73 percent / rhodium(II) octanoate / toluene / 12 h / Heating 2: 96 percent / hydrogen / RhCl(PPh3)3 / ethanol / 12 h / 2327.2 Torr 3: 75 percent / tetrabutylammonium fluoride / tetrahydrofuran / 12 h / Ambient temperature 4: 97 percent / sodium cyanoborohydride / acetonitrile; H2O / 0.25 h View Scheme