Thermochemical studies on 2,4,6-triisopropylbenzophenone and its photo-isomer, 3',5'-diisopropyl-4,4-dimethyl-3-phenyl-1,2-benzocyclobuten-3-ol. Evaluation of magnitude of light energy stored in the latter molecule.

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Standard energy of combustion and standard enthalpy of sublimation were determined for the title compounds with static bomb combustion calorimetry and with sublimation calorimetry, respectively. Derived standard enthalpies of combustion and of formation at 298.15 K were as follows: ΔH°c(c)=−(12354.3±1.8), ΔH°f(c)=−(304.6±3.4), and ΔH°f(g)=−(189±8) kJ mol−1, respectively, for 2,4,6-triisopropylbenzophenone(1), and ΔH°c(c)=−(12440.6±1.6), ΔH°f(c)=−(218.3±3.3), and ΔH°f(g)=−(101±10) kJ mol−1, respectively, for 3′,5′-diisopropyl-4,4-dimethyl-3-phenyl-1,2-benzocyclobuten-3-ol(2). The enthalpy change for the reaction: 1(g)→2(g), of 88 kJ mol−1, which may be supposed to be the magnitude of light energy stored in the latter molecule, has been discussed.
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