[en] It is shown that during vacuum-distillation of 2-isobutoxy-5-methyl-3-cyclohexyl-1,3,2-oxazaborinane in the absence of rare gas, its oxidation takes place with formation of 2,2'-oxa-bis(5-methyl-3-cyclohexyl-1,3,2-oxozaborinane. Chemical reaction yield is 10 %. Radical mechanism of the reaction is suggested

[en] Gas-phase reactions of free methyl-cations with triethylamine by the substrate vapor pressure of 1 and 10 mm mercury column were studied through the radiochemical method. The results obtained indicate that the interaction proceeds in practice completely by the proton transfer channel. Possible ways of the reaction products formation are proposed and explanation of dependence of these products yield on the substrate pressure is given on the basis of the data obtained

[en] Short communication. 6 refs.; 2 tabs

[en] Reaction of lithiated alkoxyanllenes and alkylacetylenes with organic isothiocyanates results (after intermediates alkylation) in 2,3-disubstituted pyrroles and 2,3-disubstituted pyrroles and 2,3-dihydropyridines. Key intermediates of this reaction are 1,3,4-azatrienes

[en] Using the method of IR spectroscopy it has been ascertained that in the systems sulphenyl chloride-lithium perchlorate metal cation is coordinated not with nucleophilic part of sulphenyl chloride but with its electrophilic fragment. Coordination by lithium cation of electron-donor centres of sulphenyl chloride derivatives is also confirmed by the results of quantum-chemical calculations

[en] Short communication

[en] The calculation of energy with full optimization of geometry of the 2,4,4,6- and 2,4,6,6-tetramethyl- and also 2,4,4,6,6-pentamethyl-1,3,2-dioxa(oxaza)borynanes is carried out by means of empirical (MM2) and semiempirical (AM1, MNDO) methods. The basic minimum for molecules of tetramethyl-derivatives has a flat form and high occupation of sofa and semi-chair conformers with prevalence of the latter form. Equilibrium between two invertomers of semi-chair is peculiar to the molecules of penta ethyl-derivatives. Obtained data offer essentially add conformation referrals of cyclic boric esters on the base of NMR data and open addition abilities for prediction of conformation composition of molecules in these compounds

No abstract available

[en] A complex of new efficient methods of synthesis of selenium- and tellurium-organic compounds on the basis of generation in the course of reactions of highly reactive nucleophilic and electrophilic reagents has been developed, which permitted obtaining previously unknown or not easily available classes of substances and finding more effective ways of preparation of the known compounds. 39 refs

[en] By the methods of conductometry, NMR and IR spectroscopy it has been ascertained that interaction of pyridine-N-oxides with bromine, iodine and interhalides (ICl and IBr) gives rise to the formation of crystal complexes of 1:1 composition. The complexes mentioned are of presumably ionic structure: [RC₅H₄N-O...X...O-NC₅H₄R]⁺[Y-X-Y]^-,where X,Y = Cl,Br,I