1: p-toluenesulfinic acid sodium salt With polystyrene-supported-SeCl in N,N-dimethyl-formamide
T=20°C; 6 h; solid-phase reaction;
2: styrene With boron trifluoride diethyl etherate in dichloromethane
T=20°C; 40 h;
3: With dihydrogen peroxide in tetrahydrofuran
T=20°C; 2 h;
