6533b86cfe1ef96bd12c7fdc

RESEARCH PRODUCT

Photo Induced Radical Reactions

subject

description

This article discusses a number of reactions of potential synthetic interest occurring through photochemically generated organic radicals. Emphasis is placed on the nature of the resulting photoproducts, whose formation is discussed on a mechanistic basis. If available, experimental evidence (obtained by laser flash photolysis or related time-resolved techniques) is provided. The material is organized according to the reaction types, for instance, homolytic cleavage, mesolytic cleavage, radical addition, and oxidative or reductive electron transfer. In addition to the classical carboncarbon or carbonhydrogen bond breaking processes, such as the Norrish type I reaction, the hydrogen abstraction, and the photo-Fries or the photo-Claisen rearrangements, a number of carbonheteroatom and heteroatomheteroatom cleavage processes are also covered. At the end of the article, a short section is included that deals with the experimental techniques for the characterization of photochemically generated radicals. Keywords: H-abstraction; electron-transfer reactions; homolytic cleavage; laser flash photolysis; mesolytic cleavage; radical addition