1: 47 percent / 16 M aq. HNO3 / 0.25 h / Ambient temperature 2: 93 percent / aq. sodium dithionite / diethyl ether / 0.17 h / Ambient temperature 3: 100 percent / H2 / 10percent Pd/C / methanol / 57 h / 2585.7 Torr / Ambient temperature 4: 100 percent / ferric chloride in aq. HCl / methanol / 0.25 h / Ambient temperature View Scheme

1: 47 percent / 16 M aq. HNO3 / 0.25 h / Ambient temperature 2: 93 percent / aq. sodium dithionite / diethyl ether / 0.17 h / Ambient temperature 3: 100 percent / H2 / 10percent Pd/C / methanol / 57 h / 2585.7 Torr / Ambient temperature View Scheme

1: 47 percent / 16 M aq. HNO3 / 0.25 h / Ambient temperature 3: 64 percent / boron tribromide / CH2Cl2 / 3.5 h / -78 - 20 °C View Scheme