DEVIATION FROM TROUTONS RULE AND A METHOD FOR CONVERTING A NON-CONSTITUTIVE MOLECULAR-PARAMETER INTO A CONSTITUTIVE ONE

It has been shown that the factors that determine a physical parameter of a monosubstituted hydrocarbon derivative originate mainly from the alkyl group. Thus, the physical parameters of any two series of these compounds, whether constitutive or not, plot linearly against each ot her. Examples are given which demonstrate that non-constitutive parame ters such as normal boiling points or indices of refraction, can be co nverted into constitutive ones by combining them with a constitutive p arameter corresponding to the same homologous sequence. The implicatio n of this to the recently reported deviation of the long-chain aliphat ic compounds from Trouton's rule is discussed.