Norrish Type I photoreaction

https://doi.org/10.1351/goldbook.N04219
α-Cleavage of an excited carbonyl compound leading to an acyl-alkyl radical pair (from an acyclic carbonyl compound) or an acyl-alkyl diradical (from a cyclic carbonyl compound) as a primary photoproduct.
Notes:
  1. An example is:
    N04219.png
  2. Decarbonylation of the primary diradical formed from cyclic @C00844@ and subsequent recombination of the @B00671@ afford very interesting cyclic compounds.
Source:
PAC, 2007, 79, 293. (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 375 [Terms] [Paper]