Synthesis of 4-Benzylsulfonyl-5-polyfluoroalkyl-ν-triazoles from 1,1-Dihydropolyfluoroalkyl Benzyl Sulfones

The reaction of 1,1-dihydropolyfluoroalkyl benzyl sulfones with sodium azide or trimethylsilyl azide in the presence of tertiary amines gives ammonium salts of 4-benzylsulfonyl-5-polyfluoroalkyl--triazoles. The proposed reaction scheme includes the participation of catalytic amounts of azide ion in the cyclization of the formed intermediate vinyl azides to triazoles. X-ray analysis of 1,4-diazabicyclo[2.2.2]octane salt of 4-benzylsulfonyl-5-(-H-hexafluoropropyl)--triazole has been carried out.     

Computer-based technique for generating layer sequences of polytypes

The computer operation is used to find all the possible layer sequences of poly-types. Identical arrangements are separated using the corresponding values of calculated structure factor.     

Synthesis and structure of new anionic five-coordinate silicon complexes derived from α-hydroxy acids and 1-methylpiperazine-2,5-dione

Russian Chemical Bulletin - Anionic five-coordinate complexes with two bis-O,O’-chelating ligands bearing α-hydroxy acid moieties, dicyclohexylammonium salts...     

Reactions of Alkyl 1H,1H-Perfluoroalkyl Sulfones with Ammonia, Amines, and Hydrazines

2,2,3,3-Tetrafluoropropyl and 2,2,3,3,4,4,5,5-octafluoropentyl alkyl sulfones react with ammonia, primary and secondary amines, hydrazine hydrate, phenylhydrazine, and N,N-dimethylhydrazine to afford, depending on the length of the polyfluoroalkyl chain and reaction conditions, the corresponding enamines, imines, or mono- and bis-hydrazones. The bis-hydrazone obtained from phenylhydrazine and 2,2,3,3,4,4,5,5-octafluoropentyl benzyl sulfone is capable of undergoing further dehydrofluorination to give 5-difluoromethyl- or 5-unsubstituted 1-phenylpyrazole.     

Investigation of composition and energy processes on the surface of electrodes of a lead-acid accumulator

Oxidation-reduction reactions (Pb ↔ Pb _x O _y ) without participation of sulfur and sulfates were found to take place on the surface of electrodes of a lead-acid accumulator during its operation and charging. The investigation was performed using the technique of spectroscopy of backscattered low-energy ions, Auger-spectroscopy and secondary-ion mass spectroscopy.     

The Monte-Carlo simulation of random stacking faults in close-packed structures

A new approach to the random stacking faults concentration estimation in close-packed structures (the multilayer as well) is presented. It is based on the Monte-Carlo computer simulation of stacking faults arrangement in the crystal being given by an appropriate h-k sequence.     

Reaction of 1H,1H,ωH-Perfluoroalkyl Sulfones with α-Phenylglycine Methyl Ester

Russian Journal of Organic Chemistry -     

Ion neutralization model of galvanic cell operation

An ion neutralization model of galvanic cell operation is developed. The electromotive force in this model is formed at the electrode interface owing to the different energies of conduction electrons bonds in electrodes. Constant continuous current is ensured by neutralization of electrolyte ions on the electrode surface. Charge capacity is determined by electrolyte volume and the rate of electrochemical degradation of electrode surfaces in the electrolyte. Potential energy of electrolyte ions serve as the energy source.