Abstract
A survey of the systematic application of correlation analysis to structural effects in organic compounds of four-coordinated quinquevalent phosphorus showed that the axiomatics of modern analysis (including possible types of intramolecular interaction between fragments of organic molecules and mathematical models of such interaction) will provide an adequate description of the effects of substituents attached to the phosphorus atom. Quantitative resolution into individual components of the structural effects governing the strengths of organophosphorus acids indicates that the widely used σPh constants are complicated in nature, comprising contributions by inductive, steric, and resonance interactions of substituents with the phosphorus atom. A list of 104 references is included.