Visible light ande osin Yc atalyze the synthesis of vinyl sulfonesf rom aryl sulfinates and alkenes by ap hotoredox process.T he reactions cope is broad in aryl sulfinates and alkenes and the general and simple procedure providesametal-free alternative for the synthesis of synthetically valuable vinyl sulfones.

A visible-light RuII photoredox Meerwein synthesis of isochromanones and isochromenones is described starting from diazonium salts of differently substituted anthranilic acids