Scheme 4. Substrate scope of the synthesis of γ-ketosulfones. Reaction conditions: chalcone (4, 0.25 mmol), sulfonyl hydrazide (2, 0.50 mmol), TBAI (0.05 mmol), BPO (0.50 mmol), TBHP (0.25 mmol, 70% in water), CH₃CN (2.5 mL), 100 °C, 6 h. Isolated yields based on 4.