Dipole moment and conformation of 3, 5-dibenzylidenetetrahydrothiopyran-4-one and its 1, 1-dioxide

Conclusions It was shown by dipole-moment and IR-spectroscopy methods that 3, 5-dibenzylidenetetrahydrothiopyran-4-one and its 1,1-dioxide exist in an envelope-type conformation (five atoms of the ring lie in one plane).Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 448–450, February, 1970.     

Synthesis of dibromo(dialkylamino)boranes

Conclusions Some dibromo(dialkylamino)boranes of composition Br₂B-NR₂, where R = C₃H₇, C₄H₉, C₅H₁₁, C₂H₅ were synthesized by the reaction of boron tribromide with secondary amines.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2626, November, 1974.     

Pyrroles from ketoximes and acetylene

On the basis of a comparative study and analysis of the chemical shifts in the ¹³C NMR spectra of 1-vinyl-2-arylpyrroles and 3-alkyl-1-vinyl-2-phenylpyrroles, as well as 2-phenyl- and 1-ethyl-2-phenylpyrroles, it was established that the effects of substituents in the investigated series are transmitted via a mechanism involving conjugation and induction; the conductivity and polarizability of the 2-arylpyrrole system increase when a vinyl group is introduced in the 1 position or, in the case of the 1-vinylpyrrole system, when a phenyl group is introduced in the 2 position; this is due to the increase in the degree of overall conjugation.See [1] for communication IV.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 768–772, June, 1978.     

Reaction of trichloroacetyl isocyanate with vinyl sulfides

Conclusions Trichloroacetyl isocyanate reacts with the n-butyl, isoamyl, and phenyl vinyl sulfides on the type of 1, 4-cycloaddition with the formation of 3, 1-oxazin-6-one derivatives.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2324–2325, October, 1972.     

Thermodynamic parameters of the thermal decomposition of dimethyl toluylenedicarbamates to toluylene diisocyanates

By B3LYP/6-311++G(df,p) quantum-chemical method complete thermodynamic characteristics (enthalpies, entropies, total Gibbs energies, equilibrium constants) were evaluated for separate stages of the thermal decomposition of dimethyl toluylene-2,4- and dimethyl toluylene-2,6-dicarbamates with the formation of 2,4- and 2,6-diisocyanates and methanol. The temperature ranges providing the equilibrium yield of 2,4- and 2,6-toluylene diisocyanates equal to 95?C99% were estimated. Principal possibility of obtaining practically pure 2,4- and 2,6-toluylene diisocyanates while decomposing the mixture of dimethyl toluylene-2,4- and -2,6-dicarbamates due to the regulation of temperature of the process was shown.     

IR spectra of substituted pyrroles

The IR spectra of 52 substituted pyrroles, including 24 1-vinylpyrroles, were thoroughly analyzed. The principal analytical bands of the pyrrole ring and the vinyl group were isolated. Doublet character of the bands of the stretching vibrations of the double bond ( ^v C=C) and the C-H (CH₂=) out-of-plane deformation vibrations, which indicates the presence of rotational isomerism relative to the N-vinyl bond, was detected. The integral intensify of the principal component of the ^v C=C doublet was measured for 12 of the 1-vinylpyrroles, and it is shown that it is practically independent of the structure of the alkyl substituents in the ring. Proof for the existence of a nonplanar gauche conformation for the 1-vinylpyrroles was obtained.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 910–914, July, 1977.     

Synthesis of 3-benzoyl- and 3-trichloroacetylimidazolidin-2-ones

Conclusions The reaction of benzoyl and trichloroacetyl isocyanates with ethylenimine was studied and the structure of the obtained adducts was established.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 447–448, February, 1970.     

2,6-Bis(3,5-di-tert-butyl-4-hydroxybenzyl)cycloalkanone: Synthesis and prospects for use as stabilizer for ethylene-propylene rubber

A phenolic antioxidant was synthesized by the reaction of N,N-dimethyl(3,5-di-tert-butyl-4-hydroxybenzyl) amine with cyclohexanone. The infl uence of temperature, reactant ratio, pressure, and time on the yield of the product, 2,6-bis(3,5-di-tert-butyl-4-hydroxybenzyl)cyclohexanone, was examined. The antioxidant obtained, taken both separately and in synergistic mixtures with alkylphenol and phosphites, showed high performance in inhibition of the thermal aging of ethylene-propylene rubber.