Stereoselective Addition of Dimethyl Diselenide to Trimethylethynylsilane

Russian Journal of General Chemistry -     

Use of by-product coke phenols as thermal polymerization inhibitors in processing of pyrolysis intermediates

A new procedure was suggested for modification of by-product coke phenols with the aim to eliminate drawbacks revealed in the course of their long-term use as inhibitors of thermal polymerization of unsaturated pyrocondensate components, namely, low inhibiting activity, high water solubility, and unpleasant odor. These drawbacks are eliminated by phenol formaldehyde polycondensation of total phenols, similar to Novolac production. Original Russian Text ? A.F. Gogotov, A.V. Turova, O.I. Baranov, I.I., Batura, E.V. Puchenin, V.K. Stankevich, A.A. Levchuk, A.A. Gulyaeva, D.V. Gendin, 2007, published in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 9, pp. 1573–1574.     

Rapid crystallization and thermoreversible gelation of poly(ethylene terephthalate) in polymer/oligomer binary system

Poly(ethylene terephthalate) (PET) was rapidly crystallized through thermoreversible gelation in a liquid ethylene glycol oligomer or in epoxy resin. The solutions formed gel rapidly on cooling. Polarized light microscopy and small-angle light scattering showed that these gels contain large, regular PET spherulites. The gels may be formed by two consecutive processes: the phase separation and crystallization, and gelation by formation of a three-dimensional PET network in the oligomer solvents, where the nodes of the network are PET spherulites. The crystallinity of PET recovered from polymer/oligomer gels is near 72% measured by wide-angle X-ray diffraction method, which is about 20% higher than PET samples crystallized by solution crystallization in small molecule solvent, high temperature annealing, and stretching techniques. It takes only a few minutes to form the highly crystalline phase PET in the PET/oligomer system, and the crystallinity of the dried gel is independent of the concentration of the original solution. Excimer-fluoresence and Raman spectroscopic studies indicated that PET recovered from the gels are in an ordered state with few chain entanglements. The entanglement density of the recovered PET recovered from a 20 wt % solution in ethylene glycol oligomer is as low as that of freeze-extracted PET from a 0.5 wt % solution in phenol. © 1998 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 36: 1219–1225, 1998     

Replacement of Two Methylseleno Groups by Two Phenylthio Groups in the Thermal Reaction of 1,2-Bis(methylseleno)-1-phenylethene with Diphenyl Disulfide

Russian Journal of Organic Chemistry -     

Halogen-containing spiro compounds based on a 4-vinyloxyethyl-1,4-perhydrothiazine 1-oxide

Depending on the nature of the halogen and the polarity of the solvent, the chlorination and iodination of 4-vinyloxyethyl-1,4-perhydrothiazine 1-oxide leads to new heterocyclic tertiary or quaternary ammonium salts, including halogen-containing spiro compounds.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 982–984, July, 1988.     

New method for the synthesis of functionally-substituted bis(silylmethyl)mercury compounds and benzoylgermanes

Conclusions A new method has been developed for the synthesis of substituted bis(silylmethyl)mercury compounds and benzoylgermanes based on the reaction of bis(triethylgermyl)mercury with the corresponding chloromethylsilanes and benzoyl chloride in the presence of atmospheric oxygen.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2392–2393, October, 1985.     

Reaction of α-bromo ketones with bis(triethylsilyl)- and bis(triethylgermyl)mercury

Conclusions 1. The reaction of bis (triethylsilyl)mercury with -bromoacetophenone, its halo-substituted derivatives, and 1-bromo-1-phenyl-2-propanone gave the corresponding triethylsilyl ethers of enols. In the case of bis(triethylgermyl)mercury, depending on the employed -bromo ketone, either the enol ether or a mixture of the O- and C-germylation products is formed.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2370–2372, October, 1979.