The Thorpe-Ziegler reaction or Ziegler method is the intramolecular modification with a dinitrile as a reactant and a cyclic ketone as the final reaction product after acidic hydrolysis. The reaction is conceptually related to the Dieckmann condensation.
- Thorpe-Ziegler reaction: 4-Phosphorinanone, 1-phenyl- Organic Syntheses, Coll. Vol. 6, p.932 (1988); Vol. 53, p.98 (1973) Link