Norrish Type I photoreaction
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.
  1. An example is:
  2. Decarbonylation of the primary diradical formed from cyclic @C00844@ and subsequent recombination of the @B00671@ afford very interesting cyclic compounds.