Analysis of Complex Mixtures of Aromatic Hydrocarbons. Relations between Retention Index and Molecular Structure

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Abstract
Relationships between Kovats indices on nonpolar stationary phases and the structure of alkyl- and alkenylbenzenes, defined by the molecular connectivity or connectivity index, have been established. Almost all components of aromatic naphthas are included in the different linear equations which relate both empirical indices. The constant terms of the straight lines depend on the nature and position of the substituents in the benzene ring. Substituents in para position do not influence each other, allowing the study of the effect of its nature on the ratio δI/Δχ Equations for different series of compounds, including n-alkyl- and 1,4-di-n-alkylbenzene homologous series, are calculated in order to support its identification in aromatic naphthas.