Applicability Limits of Calculation Methods for Estimating the Enthalpy of Vaporization of Organophosphorus Compounds

Quantitative relationships used today for calculating the enthalpies of vaporization of organophosphorus compounds are analyzed. The parameters of equations used in these calculations largely depend on specific structural features and are common for closely related compounds only. With various P(III) derivatives as examples, narrow ranges are distinguished in which the enthalpies of vaporization can be estimated from the boiling points using common relationships. The group contributions of phosphorus-containing fragments for calculations by the additive scheme are determined.