Correlation between the electron affinity of bromine-containing polyhalomethanes and individual chain transfer constants in the telomerization of vinyl chloride

Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, p. 1446, June, 1988.     

Accurate relations for the isotopically invariant spectroscopic parameters of diatomic molecules

Equations are obtained relating the isotopically invariant spectroscopic parameters U_mj, which must be considered as conditions in the least-squares method in spectral analysis. Expressions are given for the first seven Dankhem potential parameters in terms of U_m0 and U_m1. The contribution to the spectroscopic coefficients Y_mj due to violation of the Born-Oppenheimer approximation is calculated for¹²C¹⁶O.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 18–21, November, 1984.It remains to thank Yu. S. Makushkin, V. Ya. Galin, andV. F. Golovko for valuable discussions of the work.     

Phase-transfer catalysis in reactions of electrophilic aromatic substitution

Electrophilic substitution in aromatic compounds under conditions of phase-transfer catalysis is considered. Catalysts of phase transfer of electrophilic reagents are used; their efficiency and the mechanism of their action in organic solvent-water systems are discussed.This review is based on materials of the report delivered at the Conference Phase-Transfer Catalysis. New Ideas and Methods (March 1994).Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1895–1900, October, 1995.     

Addition of methyl dibromoacetate and methyl tribromoacetate to acrylic compounds in the presence of various initiating systems

Conclusions 1. At 70–100° the system, iron pentacarbonyl + dimethylaniline and ferric chloride + dimethylaniline, efficiently initiate the addition of methyl dibromoacetate to methyl acrylate and methyl methacrylate, and also of methyl tribromoacetate to methyl acrylate, with the predominant formation of adducts.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 592–595, March, 1973     

Quantitative determination of antibiotics immobilized on insoluble collagenous materials

For the quantitative determination of antibiotic bases (ABs) immobilized on insoluble collagenous materials (CMs) the preparation is treated with TNBS in borate buffer, pH 9.1, at 37°C for 2 h, followed by the elimination of the excess of TNBS, the splitting out of the TNP groups in the form of TNP-NH₂ in 2 N NH₄OH at 37°C for 2 h, and measurement of the concentration of TNP-NH₂ at 409 nm. The method permits concentrations of ABs in the range of 2–50 µg/cm² of surface of the CM to be determined.M. V. Lomonsov Moscow State University. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 408–412, May–June, 1989.     

Charge transfer complexes in addition reactions of CBr4 to unsaturated compounds initiated by Fe(CO)5 systems

The changes in the electronic absorption spectra of charge transfer complexes (CTC) formed in Fe(CO)₅ initiation systems qualitatively correlate with the activity of these systems in the initiated homolytic addition of CBr₄, to 1-hexene, methyl acrylate, and vinyltrimethylsilane. The formation of an Fe-(CO)₄-olefin -complex is not observed in the reaction of methyl acrylate with CBr₄, while the generation of tribromomethyl radicals occurs in a complex CTC, apparently containing all the reaction components, namely, the addend, monomer, Fe(CO)₅, and coinitiator. These data show that the study of CTC of Fe(CO)₅ initiation systems may be useful for predicting their activity in homolytic addition and telomerization reactions involving halogen-containing addends.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1457–1460, June, 1991.