1: 26 percent / (NH4)2S2O8 / AgNO3 / acetonitrile; H2O / 0.17 h / Heating 2: 1) Me2S-BH3, 2) PCC / 1) THF, 1h, reflux, 2) CH2Cl2, 1h, reflux View Scheme

1: 26 percent / (NH4)2S2O8 / AgNO3 / acetonitrile; H2O / 0.17 h / Heating 2: 1) Me2S-BH3, 2) PCC / 1) THF, 1h, reflux, 2) CH2Cl2, 1h, reflux View Scheme

dimethylsulfide borane complex; pyridinium chlorochromate 1) THF, 1h, reflux, 2) CH2Cl2, 1h, reflux; Yield given. Multistep reaction;