Sulfonylation of the benzylic C–H bond is developed through a three-component reaction of aryldiazonium tetrafluoroborates, 4-methylphenols and sodium metabisulfite (Na₂S₂O₅). The inorganic sulfite of sodium metabisulfite is used as the SO₂ surrogate. In this transformation, benzylic C(sp³)–H bond sulfonylation is achieved in the presence of a photocatalyst under visible light. A radical pathway involving the arylsulfonyl radical and intermolecular hydrogen atom abstraction is proposed.

中文翻译：

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在光催化下4-甲基苯酚的苯甲酰 C（sp ³）-H键磺酰化并插入二氧化硫†

苄基CH键的磺酰化是通过四氟硼酸芳基重氮，4-甲基苯酚和焦亚硫酸钠（Na ₂ S ₂ O ₅）的三组分反应形成的。偏亚硫酸氢钠的无机亚硫酸盐用作SO ₂替代物。在这种转化中，在可见光下，在光催化剂的存在下，实现了苄基的C（sp ³）–H键磺酰化。提出了涉及芳基磺酰基和分子间氢原子抽象的自由基途径。