Table of contents

Volume 69

Number 2, February 2000

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95

and

The most reliable values of the basic thermodynamic parameters of the C60 and C70 fullerenes are recommended based on the analysis of the published data and original calculations, viz., enthalpies of formation in the solid and gaseous states, saturated vapour pressures, enthalpies of sublimation, enthalpies of phase transitions, heat capacities, entropies in the condensed state and heat capacities and entropies in the ideal gas state. The factors influencing the results of thermodynamic studies of fullerenes are discussed. Various aspects of crystal structure determination, PVT-relationships and frequencies of normal modes of the C60 and C70 fullerenes are considered in order to interpret and correlate the thermodynamic data and extend them to a wide temperature range. The bibliography includes 135 references.

105

, and

New data on the synthesis and chemical transformations of alkenyliodonium salts are summarised and analysed. The bibliography includes 146 references.

121

and

The published data on the synthesis of organoaluminium compounds involving metal complex catalysts are generalised and systematised. Hydro-, carbo- and cycloalumination reactions of alkenes, conjugated dienes and alkynes catalysed by Ti and Zr complexes are considered in detail. The use of organoaluminium reagents in organic synthesis and novel reactions involving these compounds are discussed. The bibliography includes 240 references.

137

, and

The data on catalytic dehydrocondensation of organylsilanes with the formation of Si–Si bonds are systematised and generalised. The mechanism and general features (the effects of the nature of the reactants and the catalyst, the solvent and the reaction conditions) of these reactions catalysed by cyclopentadienyl complexes of transition metals are considered. Electrochemical and other procedures for the dehydrocondensation of organylsilanes are discussed. The bibliography includes 220 references.

153

Empirical relations describing the reactivity of reagents in radical addition reactions and the results of quantum-chemical calculations of the activation energy of these processes are considered. The experimental data obtained for the addition of atoms and radicals to molecules with multiple bonds are analysed in terms of the parabolic model. The following characteristics and factors are shown to affect the activation energy of radical addition: the reaction enthalpy, the strength of the arising bond, the radius of the atom having a free valence, the presence of a π bond adjacent to the reaction centre, the interaction of two polar groups, the multidipole interaction, the steric factor, the non-linearity of the reaction centre, and the force constants of the reacting bonds. The bibliography includes 85 references.

165

The results of studies on sonochemical catalytic reactions are generalised. The effects of ultrasound on processes of preparation, activation and regeneration of catalysts as well as its influence on the course of catalytic reactions are considered. The advisability of ultrasonic treatment in different stages of catalytic processes is discussed. The bibliography includes 143 references.

179

and

Data on the heat-accumulating properties of melts are generalised. The principles and methods of thermal energy accumulation with the use of melts are considered. The problem of search for heat-accumulating materials with the required properties based on multi-component systems of anhydrous inorganic compounds is discussed. The bibliography includes 57 references.