https://doi.org/10.1351/goldbook.A00004
- The fission of a bond originating at an atom which is adjacent to one assumed to bear the charge; the definition of β-, γ-cleavage then follows automatically. The process: would thus be described as α-fission of a ketone with expulsion of a radical R1·. The carbon atoms of the radical R1· are called the α-, β-, γ-carbons, starting with the atom nearest the functional group.
- Homolytic cleavage of a bond connecting an atom or group to an excited chromophore. Often applied to a bond connected to a carbonyl group, in which case it is called aNorrish Type I photoreaction.Note:
This reaction should be distinguished from analpha-(α-)elimination.