Standard enthalpies of formation of diphenyl oxalate and benzoic anhydride and some related bond dissociation energies

Abstract

The standard enthalpies of combustion of diphenyl oxalate and benzoic anhydride have been measured by static combustion calorimetry. The results have been used to derive the standard enthalpies of formation: ΔH_f°(diphenyl oxlate, c)=–129·0 ± 0·8 and ΔH_f°(benzoic anhydride, c)=–99·3 ± 0·4 kcal mol^–1. The thermochemistry of these and related oxygenated compounds is discussed. Values for bond dissociation energies have been derived and are discussed in the context of possible decomposition pathways.