K. S. Pushchevaya

Bio: K. S. Pushchevaya is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Organosilicon & Polymerization. The author has an hindex of 1, co-authored 10 publications receiving 4 citations.

Infrared absorption spectra of 1,1-substituted silicacyclobutanes, silicacyclopentanes, and the corresponding polymers

Abstract: 1. The IR absorption spectra of a series of 1,1-substituted silicacyclobutanes, silicacyclopentanes, and the corresponding polymers were obtained and investigated. 2. The frequencies characterizing the 1,1-substituted silicacyclobutane and silicacyclopentane rings were established. 3. As a result of an investigation of the IR spectra of the polymers produced by thermal polymerization of a number of 1,1-substituted silicacyclobutanes, it was established that the polymerization products are heterochain polymers with the structural fragment as the unit of the basic chain. 4. In the catalytic polymerization of 1,1-substituted silicacyclopentanes, heterochain polymers are formed, with the structural fragment as the unit of the basic chain.

Organosilicon compounds having hydrocarbon bridges between silicon atoms

Abstract: 1. With the aid of infrared spectra the structure of the fundamental structural unit was established for catalyticpolycondensation products obtained from α,ω-bistrimethylsilylalkanes and also for polymers obtained by the thermal polymerization of 1,1-dimethylsilacyclobutane and the catalytic polymerization of 1,1-dimethylsilacyclopentane. 2. Under the action of aluminum halides, p-bis(trimethylsilylmethyl)benzene and p-bistrimethylsilylbenzene react with liberation of tetramethylsilane and formation of sila-hydrocarbon condensation products. The latter contain alternations of silicon atoms and p-phenylenedimethylene or p-phenylene fragments in the chain.

Synthesis and reactions of 1-(chloromethyl)-1-methylsilacyclopentane

Abstract: 1. 1-(Chloromethyl)-1-methylsilacyclopentane was synthesized from dichloro(chloromethyl)methylsilane and tetramethylene bis(magnesium bromide). 2. 1-(Chloromethyl)-1-methylsilacyclopentane is active at the chlorine in nucieophilic-substitution reactions and can serve as the starting substance for the synthesis of silacyclopentanes having functional groups in the methyl group. 3. Under the action of aluminum chloride 1-(chloromethyl)-1-methylsilacyclopentane is converted into 1-chloro-1-memylsilacyclohexane. This is the first recorded case of the enlargement of a heterocycle containing a silicon atom in the ring.

Transformation of polymethylenesilanes under the influence of aluminum chloride

Abstract: 1. Dimethylhexamethylenesilane is polymerized under the influence of aluminum chloride with an opening of the ring. Methylethylpentamethylenesilane, isomeric with it, undergoes disproportionation of the alkyl radicals under the same conditions. 2. Dimethylpentamethylenesilane (80% yield) and dimethylhexamethylenesilane (1–3% yield) are formed from α,Ω-bis(trimethylsilyl)penta- and -hexamethylene under the influence of aluminum chloride.

Redistribution reactions in the chemistry of silicon

Abstract: In recent years there has been what could be described as a renaissance in the redistribution reaction, and the growing interest in the chemistry of the metalloids has been partially responsible for this renewed interest. The generality and potential synthetic utility of this reaction in the chemistry of silicon, germanium, tin, boron, and phosphorus has necessitated a better understanding of this type of chemical transformation. With the advancement of modern computation and instrumental analytical techniques, this need is slowly being realized. Of the above mentioned elements, the chemistry of silicon has probably been the most intensely studied during recent years and, thus, it is not surprising that the chemistry of silicon provides the most comprehensive picture of the redistribution reaction. The redistribution reaction has been the subject of recent reviews by Moedritzer'\" and by Lockhart3 which cover quite comprehensively the general application of this reaction to silicon chemistry. In this current brief review, we shall confine our attention to the simplest form of this reaction; namely, that involving the redistribution of monodentate ligands about a central silicon atom.

Alkylation of 2-methylimidazole with iodomethylsilanes

Abstract: 2-Methyl-1,3-bis[(1-methylsilolan-1-yl)methyl]-1H-imidazolium triiodide, 1,3-bis{[dimethyl-(phenyl)silyl]methyl}-2-methyl-1H-imidazolium iodide and triiodide, and cyclic 3,3,5,5,10-pentamethyl-4-oxa-7-aza-1-azonia-3,5-disilabicyclo[5.2.1]deca-1(10),8-diene iodide were synthesized by solvent-free reactions of 2-methyl-1H-imidazole with 1-(iodomethyl)-1-methylsilolane, (iodomethyl)(dimethyl)phenylsilane, and ethynyl(iodomethyl)(dimethyl)silanes, respectively, in the absence of base catalyst.

Four-Membered Rings With One Silicon, Germanium, Tin, or Lead Atom

Abstract: Chemistry of four-membered rings incorporating one silicon, germanium, tin or lead atom for the period from 2007 to 2019 has been reviewed. This article focus on structural and spectroscopic properties as well as the reactivity of these species.