Abstract

Abstract Hypervalent iodine compounds traditionally demonstrate photochemical reactivity under direct photoexcitation using noncyclic iodine(III) reagents or in combination with the iodine. Recently, cyclic iodine(III) reagents have enabled new photochemical reactivity with the indirect photosensitization (photoredox catalysis). Hypervalent iodine compounds show substrate activation reactivity for carboxylic acids, alcohols, and amines to generate the corresponding oxygen or nitrogen radials under photochemical conditions. In addition, the hypervalent iodine‐coordinated carbon and azide species participate as radical precursors, oxidative quenchers, or radical acceptors in photoredox catalysis reactions. It is expected that hypervalent iodine compounds will find further photochemical reactivity especially under photoredox catalysis conditions.

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