Radical addition reactions to cyclopropenes

This review focuses on the reactivity of cyclopropenes in addition reactions of carbon- or heteroatomcentered radicals, generated through classical initiating systems or photocatalysis. These addition reactions lead to cyclopropyl radicals as intermediates which can undergo subsequent atom transfer (inter- or intramolecular) or be involved in cyclization reactions. In some cases, depending on the structure of the added radical, the cyclopropyl radical intermediate can evolve by ring-opening and elimination reactions leading to open-chain unsaturated products or heterocyclic compounds. This review discusses the contributions that have been made in this field and highlights the scope and mechanisms of the different transformations. [GRAPHICS] .