1: 95 percent / Et3NHF / tetrahydrofuran / 3 h / Ambient temperature 2: 80 percent / lithium perhydro-9b-boraphenalyl hydride / tetrahydrofuran / 1.) -78 deg C, 30 min, 2.) room temp., 12 h 3: 1.) 47-52percent aq. HF, 2.) 5percent aq. HCl / 1.) acetonitrile, room temp., 30 min, 2.) THF, reflux, 20 h View Scheme