Hoffmann's method applied to ethylene oxide,ethylenimine, cyclopropane,and cyclopeopyl ethers

The method is applied to six compounds each containing a three-membered ring. It is found that a cyclopropane ring interacts with ether oxygen attached to it to give some of the features of a -electron system. Inclusion of N or O in the three-membered ring lowers the top filled and bottom vacant levels, especially the latter.     

Crystal structure of LiHo3[GeO4]2F2

Institute Crysallography, Academy of Sciences of the USSR. Translated from Zhurnal Strukturnoi Khimii, Vol. 32, No. 4, pp. 173–175, July–August, 1991.     

Autoradiography studies of the processes of wetting and spreading

Data of the studies of wetting and spreading in liquid metal-solid metal systems, as well as the modification of various solid surfaces with aqueous surfactant solutions, by the autoradiography technique are reported.Translated from Kolloidnyi Zhurnal, Vol. 67, No. 1, 2005, pp. 26–31.Original Russian Text Copyright © 2005 by Dolzhikova, Bogdanova, Summ, Korobkov.     

First synthesis of α-aminophosphonates from natural porphyrin derivatives by the Kabachnik—Fields reaction

A preparative procedure is proposed for the synthesis of α-aminophosphonates of natural porphyrins by the microwave-assisted Kabachnik—Fields reaction.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 256–259, January, 2005.     

Mechanism of Hexafluoropropylene Formation in Gas-Phase Pyrolysis of Tetrafluoroethylene

The consecutive formation of short-lived intermediates during tetrafluoroethylene conversion into hexafluoropropylene by gas-phase pyrolysis under conditions of pulsed adiabatic compression was studied by kinetic spectroscopy. The process mechanism was determined in detail. The ways for improving the pyrolysis procedure were considered.     

Synthesis and magnetic properties of liquid crystalline lanthanide complexes with alkylsulfate counterions

The reaction of Schiff"s base L with lanthanide alkylsulfates affords liquid crystalline complexes with the general formula L₃Ln(C_nH_2n+1OSO₃)₃. The liquid crystalline structure and magnetic properties are studied by polarization thermal microscopy, differential scanning calorimetry, X-ray diffraction, and measurement of magnetic susceptibility. The temperatures of the existence of the mesophase and magnetic anisotropy of the complexes with the same lanthanide depend on the chain length of the alkyl fragment in the sulfate anion.     

Oxidative coupling of malononitrile with formation of 1,1,2,3,3-pentacyanopropene salts

A simple and convenient route for the synthesis of 1,1,2,3,3-pentacyanopropene salts is reported. These salts are formed by interaction of malononitrile with SeO₂ in presence of organic N-containing bases or pyridinium salts.     

Construction of basis sets of hybrid atomic orbitals for describing the nonequivalent bonds of an atom with four neighboring atoms (sp 3 hybridization)

Methods for constructing the basis sets of sp³ hybrid atomic orbitals for atoms surrounded with four neighboring atoms are discussed in detail. The results obtained are generalized as a theorem of sp³ hybridization. A general method is proposed for constructing basis sets of orthogonal sp³ hybrid atomic orbitals for atoms with distorted tetrahedral environments. V. I. Vernadskii Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences. Translated fromZhurnal Strukturnoi Khimii, Vol. 36, No. 6, pp.969–975, November–December, 1995. Translated by I. Izvekova     

Coulomb energy averaged over the nlN-atomic states with a definite spin

A purely group-theoretical approach (for which the symmetric group plays a central role), based upon the use of properties of fractional-parentage coefficients and isoscalar factors, is developed for the derivation of the Coulomb energy averaged over the states, with a definite spin, arising from an atomic configuration nl^N. © 1995 John Wiley & Sons, Inc.