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G4 thermochemistry and variants can define the relative thermodynamic stabilization in small-ring and acyclic carbenes. On page 675 (DOI: 10.1002/qua.24654), Zikri Altun, Erdi A. Bleda, Carl Trindle, and Jason Wang characterize relative stabilities of carbenes by employing enthalpies of an isodesmic reaction in which methylene is produced by the reaction of methane with the carbene. The cover depicts a series of small-ring N-heterocyclic carbenes, ranked by G4 stabilization energies.