in N,N-dimethyl-formamide mixt. (Ph3BiMe)(BF4), sodium benzenesulfinate dihydrate, and DMF was stirred at room temp. for 2 h; water and Et2O was added and stirred, organic phase was separated and dried over MgSO4 and evapd.;

in dichloromethane; water

in N,N-dimethyl-formamide mixt. (Ph3BiMe)(BF4), sodium benzenesulfinate dihydrate, and DMF was stirred at room temp. for 2 h; water and Et2O was added and stirred, organic phase was separated and dried over MgSO4 and evapd.;

1: water; ethanol 2: tetrahydrofuran View Scheme