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Biphenyl and diphenyl oxide are important industrial chemicals with a broad range of applications. The enthalpies of vaporization and enthalpies of formation of some biphenyl derivatives were determined. A "double difference" method for calculating the enthalpies of formation of aromatic radicals and the bond dissociation energies was proposed. The enthalpies of formation of the radicals biphenyl, diphenyl oxide, and phenyl oxide were determined, using their enthalpies of formation. The energies of reorganization of these radicals and bond dissociation energies were calculated.