Monograph . - M. : Publishing house of the USSR Academy of Sciences, 1960. 217 s. The present monograph aims to cover the issues of the chemistry of hydrocarbon reactions occurring in modern heterogeneous catalytic processes, reactions occurring on aluminosilicate and polyfunctional catalysts .. When writing it, the author sought to comprehensively cover works in the field of isomeric transformations of hydrocarbons, since the available material is too extensive. The main attention is paid to the reactions of isomerization of hydrocarbons under conditions of heterogeneous catalysis. The monograph is based on the author's own experimental studies carried out for ten years at the Institute of Oil of the USSR Academy of Sciences .. When writing it, the author sought to present such theoretical questions ,. as a reaction mechanism, kinetic and thermodynamic parameters of the reactivity of hydrocarbons , parallel presentation of the main experimental material , by illustrating examples of conversions of various individual hydrocarbons.