1: (Ph3P)3RhCl, Et3SiH / benzene / 0.58 h / 70 °C 2: aq. HF / acetonitrile / 0.83 h / Ambient temperature 3: 9.6 mg / NaBH4 / methanol / 0.45 h / -15 - -13 °C 4: 70 percent / p-TsOH*H2O / benzene / 1.08 h / Ambient temperature View Scheme