R. G. Mirskov

Hydroxyalkylammonium salts of organylsulfanyl(sulfonyl)acetic acids—New stimulators of biological processes

The article gives a survey of methods of synthesis and specific biological activity of hydroxyalkylammonium salts derived from organylsulfanyl(sulfinyl, sulfonyl)acetic acids which can be used as growth stimulators with respect to beneficial bacteria, yeasts, and fungi in large-scale biotechnology processes for manufacture of fodder and baker’s yeasts and citric acid, barley sprouting for the preparation of brewer’s malt, and breeding of silkworms.

An investigation of the mechanism of the reation of allyltriethylstannane with bromotrichloromethane by radiofrequency probing and chemically induced dynamic nuclear polarization (CIDNP)

Abstract The methods of radiofrequency probing (RFP) and chemically induced dynamic nuclear polarization (CIDNP) have been used to study the mechanism of the reaction of allyltriethylstannane with bromotrichloromethane. The CIDNP effects which have been detected prove the presence of radical stages in this reaction. An assumption has been made about a possible radical pathway for the β-decomposition of elementorganic compounds.

MASS SPECTRA OF LINEAR AND BRANCHED METHYL(VINYL)SILOXANES

The mass spectra of some linear and branched methyl(vinyl)siloxanes Me3SiOSi(Me)(R)(OSiMeVin)nY (R=Vin, OSiMe3; Y=OSiMe3, Cl;n=0–2) were studied. The regularities of their fragmentation and an anomalously high probability of elimination of the ethylene molecule to form the stable 1,3-dioxa-2,4,6-trisilacyclohexane skeleton were revealed.

Complexes of triethanolamine with aroxyacetic acids and their metal salts as a new class of biologically active compounds

A series of complexes of triethanolamine with metal salts of aroxyacetic acids has been prepared. The complexes are perspective biologically active compounds for search for new immunomodulating, antistress, anti-inflammatory and other types of agents. The structure and acid-base properties of these compounds were studied by NMR and IR spectroscopy and potentiometric titration.

Photoinitiated reactions of allyltriorgano-silanes and -germanes with polyhaloidalkanes: study of the mechanisms of the reactions by means of the 1H CIDNP method

Abstract The radical stages in the photolysis reactions of various allyltriorgano-silanes and -germanes (R 3 MCH 2 CHCH 2 ; M = Si, Ge) with polyhaloidalkanes have been studied using the 1 H CIDNP method. It has been shown that the mechanism of the photochemical reaction for M = Sn, Ge is different from the case when M = Sn. Some rather stable R 3 MCH 2 CH(Hal)CH 2 R′ (M = Si, Ge) derivatives were isolated and characterized.

Acyl iodides in organic synthesis: VII. Reactions with trialkyl(alkynyl)silanes,-germanes, and-stannanes

Reactions of acyl iodides R1COI (R1=Me, Ph) with trialkyl(alkynyl)silanes,-germanes, and stannanes (R2C≡CMR33; M=Si, Ge, Sn) were studied. Acyl iodides reacted with the germanium and tin derivatives with cleavage of the M-Csp bond and formation of the corresponding trialkyl(iodo)germanes and-stannanes R33MI (M=Ge, Sn) and alkynyl ketones R1C(O)C≡CR2 and R1C(O)C≡CC(O)R1. By contrast, the reaction of acetyl iodide with ethynyl(trimethyl)silane gave only a small amount of 1,2-diiodovinyl(trimethyl) silance as a result of iodine addition at the triple bond. Bis(trimethylsilyl)ethyne failed to react with acetyl iodide.

Generation and capture of methyl(vinyl)silanone

Methyl(vinyl)dichlorosilane reacts with DMSO in the presence of hexamethyldisiloxane to give the corresponding linear oligosiloxanes of the general formula Me3Si(OSiMeVin)nOSiMe3 (n=1–6) as well as MeSi(OSiMe3)3 and Me3Si(MeOSiVin)mOSi(OSiMe3)(Me)OSiMe3 (m=1–2). The same reaction in the presence of chlorotrimethylsilane results in oligomers of the general formula Me3Si(OSiMeVin)nCl (n=1–3). A possible scheme of their formation is discussed.

Synthesis of high-purity trialkylgermanethiols

A procedure was developed for preparing high-purity trialkylgermanethiols by the reaction of hexaalkyldigermoxanes with hydrogen sulfide.

Synthesis of high-purity tris(trimethylsilyl) borate

A method was developed for synthesis of high-purity tris(trimethylsilyl) borate by reaction of trimethylacetoxysilane with powdered boric acid.

A NEW METHOD FOR THE SYNTHESIS OF AZIRIDINE DERIVATIVES

The photoinduced reaction ofN-trialkylstannyl-N-triorganylsilyl-substituted allylamines with perfluorocarbonyl iodides results in the formation of 1-triorganylsilyl-2-(α,a-dihydroperfluoroalkyl)aziridines.