Synthesis of 4-alkylthio-2-(o-hydroxyphenyl)-1,3,5-triazines by recyclization of 4-oxo-1,3-benzoxazine perchlorates

A method has been developed for synthesis of 4-alkylthio-2-(o-hydroxyphenyl)-1,3,5-triazines by treatment of 4-oxo-1,3-benzoxazine perchlorates with S-methyl, benzyl, and allyl-isothioureas.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1658–1661, December, 1989.     

A spin-trap ESR study of the decomposition of alkyl formates

Conclusions By using nitroso compound ESR spin traps it has been shown that the alkyl formates break down into radicals under irradiation at 2537 Å and 25°C, and this regardless of whether or not the system contains added tert-butyl peroxide. The mechanism of breakdown varies with the alkyl-formate structure, Under our conditions of irradiation, the product radicals were as follows: OOCH₃ from methyl formate; OOCH₂CH₃ and HCOOHCH₃ from ethyl formate; OOC(CH₃)₃ and (CH₃)₃ from tert-butyl formate.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 542–545, March, 1977.     

ESR spectroscopic investigation of steric and polar factors in the addition of radicals to unsaturated compounds

The rate constants of the addition of CCl₃CH₂ClCH₃(R⁶) radicals to -methyl-styrene, styrene, methyl methacrylate, methyl acrylate, and acrylonitrile and of CCl₃CH₂(CH₃)₂(R⁷) radicals to styrene, methyl acrylate, and acrylonitrile were determined by ESR spectroscopy. It was shown that the radicals R⁶ and R⁷ possess approximately equal reactivity in addition to unsaturated compounds, despite the difference in the donor-acceptor properties of the substituents at the vinyl group. In a comparison of the reactivity of radicals R⁶ and R⁷ with the reactivity of radicals CCl₃CH₂H₂(R¹), CCl₃CH₂HCH₃(R³), CCl₃CH₂HCl(R⁴), and ClCH₂CH₂Cl₂(R⁵) [1] in addition reactions, it was shown that polar and steric effects of the substituents situated in the -position to the radical site of the above-mentioned radicals, as well as the donor-acceptor properties of the substituents at the vinyl group in the unsaturated compounds, lead to appreciable changes in reactivity.A. N. Nesmeyanov Institute of Heteroorganic Compounds, Russian Academy of Sciences, 117813 Moscow. Translated from Izvestiya Akademii Nauk, Seriya Khimicheskaya, No. 1, pp. 136–141, January, 1992.     

Synthesis and properties of aminomethyloxy derivatives of (1-Propylsulfanyl)pentane

New 2-aminomethyloxy derivatives of 1-(propylsulfanyl)pentane were prepared by condensation of 1-(propylsulfanyl)pentan-2-ol with formaldehyde and secondary amines. The starting 1-(propylsulfanyl)pentan-2–ol was synthesized by the reaction of 1–propanethiol with 1–bromopentan–2–ol. The structures of the products were proved by elemental analysis, IR and ¹H NMR spectroscopy, and mass spectrometry. The compounds were tested as antimicrobial additives to lubricating oils and as antiseptics against bacteria and fungi.     

Simulation of the Electronic Structure of Graphene–Polyvinylidene Fluoride Composite Material

Physics of the Solid State - Theoretical models of shockproof composite materials based on two-layer graphenes and multilayer polyvinylidene fluoride C124H40 + n(H–(C2H2F2)5–H) (n =...     

Synthesis and properties of methyleneoxyamine derivatives of 1-(propylthio)octane

Synthesis of new methyleneoxyamine derivatives of 1-(propylthio)octane by condensation of 1-(propylthio)octane with secondary amines and formaldehyde was carried out. Structure of the synthesized compounds was proved by elemental analysis, IR, ¹H NMR, and mass spectra. Compounds were tested as antimicrobial additives to lubricating oils. They were found to suppress effectively the activity of microorganisms.     

Photopolymerization of (meth)acrylates in the presence of polyheteroarylenes

The free-radical photopolymerization of (meth)acrylates in the presence of a polyheteroarylene dissolved in a monomer has been studied. The kinetics of the radical polymerization of these monomers mediated by polyheteroarylene and the corresponding model compound has been investigated by differential scanning photocalorimetry and IR spectroscopy. Based on the experimental data, it is inferred that copolymers form due to chain transfer and/or chain termination to polyheteroarylene macromolecules. With the use of ESR spectroscopy, new radicals generated upon the addition of model polyheteroarylene compound to the initial solutions are discovered and characterized. The mechanism of the formation of copolymers is advanced.     

Synthesis of 1-propylsulfanylhexane aminomethoxy derivatives

Synthesis was performed of new aminomethoxy derivatives of 1-propylsulfanyl hexane by Mannich condensation of 1-propanethiol, secondary amines, and formaldehyde. The structure of compounds synthesized was established by elemental analysis, mass spectrometry, IR and ¹H NMR spectroscopy. Some compounds obtained were tested as antimicrobial additives to lubricating oils, and also as antiseptics against bacteria and fungi. It was established that these compounds are more efficient antimicrobial substances than the preparations currently used.     

Pyrroles from ketoximes and acetylene. 43. 1,2-Dihaloalkanes and vinyl chloride in the synthesis of 2-(4-alkylthiophenyl)pyrroles

2-(4-Alkylthiophenyl)-3- and 2-(4-alkylthiophenyl)-5-methylpyrroles and their 1-vinyl derivatives were synthesized by the reaction of alkyl(4-alkylthiophenyl)ketoximes with dihaloalkanes or vinyl chloride in the KOH-DMSO system at 120–140C and atmospheric pressure.See [1] for Communication 42.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1, 1337–1340, October, 1990.