Standard thermochemical characteristics of combustion and formation of 3,5-di-tert-butyl-o-benzoquinone and 3,6-di-tert-butyl-o-benzoquinone at T = 298.15 K

• We report the results of thermochemical study for benzoquinone derivatives.
• Optimal conditions for determination of combustion energy for benzoquinone were done.
• The formation enthalpies for crystalline benzoquinone have been detected at T = 298.15 K.
• The formation enthalpy of isomeric quinones were compared.

Optimal conditions for investigations of thermodynamic properties have been determined experimentally by the method of combustion calorimetry for compounds of the o-benzoquinone series. In the present work, the energies of combustion in oxygen were measured at T = 298.15 K by static bomb combustion calorimetry for 3,5-di-tert-butyl-o-benzoquinone and 3,6-di-tert-butyl-o-benzoquinone. The experimental values have been used to calculate the standard (р° = 0.1 MPa) molar enthalpy of combustion ΔcHom and formation ΔfHom for the examined compounds in the crystalline phase.