Scheme 4

Synthesis of various alkenyl methyl sulfones. ^a The experimental conditions were as follows: 1,1-diarylalkenes (0.2 mmol), CH₃SSO₃Na (0.4 mmol), Cu(NO₃)₂ (0.02 mmol), hypervalent iodine (0.4 mmol), and solvent (2.0 mL) were subjected to heating at 80 °C for 24 h. ^b Separated yield