bis(tricyclohexylphosphine)benzylidene ruthenium(IV) dichloride in 1,2-dichloro-ethane 3 h; Heating;

1: 1.) diborane, 2.) NaOAc, 30percent H2O2 / 1.) THF, 25 deg C, 2 h, 2.) THF-H2O, 25 deg C, 2 h 2: 80 percent / Et3N / CH2Cl2 / 0 deg C, 0.5 h; RT, 3 h 3: 70 percent / Na2S*H2O, S / dimethylformamide / 24 h / 90 °C 4: 0.120 g / KOH / methanol / 24 h / Ambient temperature View Scheme

1: 1.) diborane, 2.) NaOAc, 30percent H2O2 / 1.) THF, 25 deg C, 2 h, 2.) THF-H2O, 25 deg C, 2 h 2: 80 percent / Et3N / CH2Cl2 / 0 deg C, 0.5 h; RT, 3 h 3: 70 percent / Na2S*H2O, S / dimethylformamide / 24 h / 90 °C 4: 0.120 g / KOH / methanol / 24 h / Ambient temperature View Scheme

1: 1.) diborane, 2.) NaOAc, 30percent H2O2 / 1.) THF, 25 deg C, 2 h, 2.) THF-H2O, 25 deg C, 2 h 2: 80 percent / Et3N / CH2Cl2 / 0 deg C, 0.5 h; RT, 3 h 3: 70 percent / Na2S*H2O, S / dimethylformamide / 24 h / 90 °C View Scheme