The standard molar enthalpy of formation of 2,3-diphenylcycloprop-2-en-1-one

Article abstract of DOI:10.1016/0021-9614(85)90049-7

The standard molar enthalpies of combustion and sublimation for 2,3-diphenylcycloprop-2-en-1-one (C15H10O) at 298.15 K have been redetermined.The experimental values: Δ_fH⁰_m(C15H10O, cr) = (198.03 +/- 1.96) kJ*mol^-1 and Δ^g_crH⁰_m(C15H10O) = (119.7 +/- 8) kJ*mol^-1 yield a value for Δ_fH⁰_m(C15H10O, g) = (317.7 +/- 8.2) kJ*mol^-1.If one assumes a ring strain in cycloprop-2-en-1-one of 280 kJ*mol^-1, then the resonance stabilization in the three-membered ring is 88 kJ*mol^-1.This indicates substantial ground-state aromatic stabilization in this molecule.