1: -78 °C 2: 70 percent / BH3*Me2S / tetrahydrofuran / Heating 3: 9 percent / MeOH, 0.34 M KOH / Ambient temperature; electrolysis: carbon anode and Pt cathode; constant current 13.9 mA/cm2; charge passed: 5.0 F/mol View Scheme

1: -78 °C 2: 70 percent / BH3*Me2S / tetrahydrofuran / Heating 3: 9 percent / MeOH, 0.34 M KOH / Ambient temperature; electrolysis: carbon anode and Pt cathode; constant current 13.9 mA/cm2; charge passed: 5.0 F/mol 4: Ambient temperature View Scheme

1: -78 °C 2: 70 percent / BH3*Me2S / tetrahydrofuran / Heating 3: 9 percent / MeOH, 0.34 M KOH / Ambient temperature; electrolysis: carbon anode and Pt cathode; constant current 13.9 mA/cm2; charge passed: 5.0 F/mol 4: Ambient temperature 5: 75 percent / BH3*Me2S / tetrahydrofuran / 2 h / Heating View Scheme