1.1: HCl / tetrahydrofuran / 0.5 h / 20 °C 2.1: triethylamine / tetrahydrofuran / 0.17 h / 0 °C 2.2: sodium cyanoborohydride / tetrahydrofuran / 8 h / 0 - 20 °C 3.1: 99 percent / LiOH*H2O / tetrahydrofuran; H2O / 9 h / 20 °C 4.1: hydrogen / Pd(OH)2/C / methanol / 8.5 h / 20 °C / 760 Torr 5.1: potassium carbonate / tetrahydrofuran; H2O / 0 - 20 °C 6.1: 78 percent / Jones' reagent / acetone / 8 h / 0 - 20 °C View Scheme