Abstract
The enthalpies of solvation of tbur geometric isomers of 2,5-dimethyl-l-phenyl-tthioxophosphorinan-4-one in chloroform, nitrobenzene, and methanol were calculated using the enthalpies of vaporization of the isomers determined by the modified Solomonov.Konovalov method from the en~halpies of solution of the compounds in CCI,~ and p-xylene and molar refractions. The enthalpies of formation [AItr ~ of the isomers in the condensed and gas phase were assessed in the framework of Benson's group additivity scheme by summing the =\Hf ~ values for phosphacycloketone IYagments obtained from molecular mechanics calculations with the contributions of the phenyl group and S atom attached [o the P atom.
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