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Heat of formation of Benzophenone Oxide
Author(s) -
Hartstock F. W.,
Kanabuskaminska J. M.,
Griller D.
Publication year - 1989
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550210302
Subject(s) - chemistry , benzophenone , enthalpy , standard enthalpy of formation , standard enthalpy change of formation , exothermic reaction , calorimetry , oxide , standard enthalpy of reaction , medicinal chemistry , photochemistry , organic chemistry , thermodynamics , physics
The heat of formation of benzophenone oxide, Ph 2 CO 2 , was measured using photoacoustic calorimetry. The enthalpy of the reaction Ph 2 CN 2 + O 2 → Ph 2 CO 2 + N 2 was found to be −48.0 ±0.8 kcal mol −1 and ΔH f (Ph 2 CN 2 ) was determined by measuring the reaction enthalpy for Ph 2 CN 2 + EtOH → Ph 2 CHOEt + N 2 (−53.6 ±1.0 kcal mol −1 ). Taking ΔH f (PhCHOEt) = −10.6 kcal mol −1 led to ΔH f (Ph 2 CN 2 ) = 99.2 ± 1.5 kcal mol −1 and hence to ΔH f (Ph 2 CO 2 ) = 51.1 ± 2.0 kcal mol −1 . The results imply that the self‐reaction of benzophenone oxide i.e., 2Ph 2 CO 2 → 2Ph 2 CO + O 2 is exothermic by −76.0 ±4.0 kcal mol −1 .