Tetracyclines Communication 22. Stereochemistry of 2- and 3-substituted 10-oxo-9-hydroxy-9-methyl-1,2,3,4,4a,9,9a,10-octahydroanthracenes

Summary Intramolecular cyclization reactions were investigated, and the configurations were proved of 2- and 3-substituted 10-oxo-9-hydroxy-9-methyl-1,2,3,4a,9,9a.10-octahydroanthracenes of type (I), which are possible intermediaries for the synthesis of tetracyclines and their analogs.Translated from Izvestiya Akademii Nauk SSSR, Setiya Khimicheskaya, No. 6, pp. 1024–1035, June, 1964     

Delocalization of unpaired electron in copper(II) complexes with azo compounds

Conclusions Contact interaction of the unpaired electron of the copper atom with the two equivalent nitrogen atoms, attached directly to the copper atom, is accomplished in the inner complexes of copper(II) with bis(benzeneazo-p-cresol) derivatives.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2771–2773, December, 1973.The authors thank B. I. Stepanov for the supplied compounds.     

Optical and electrophysical properties of defects in high-purity CdTe

The electronic spectrum of defects formed in low-temperature synthesis and growth of high-purity CdTe[111]from the vapor phase of the starting components has been studied by the photoluminescence and photoconductivity methods, as well as using the analysis of the behavior with temperature of the conductivity. The studies have revealed in the crystals, in addition to the comparatively shallow centers involving primarily donors and acceptors contained in residual substitutional impurities, deep acceptor states with activation energies of 0.25, 0.60, and 0.86 eV, which differ in the character and magnitude of the localizing potential. While the deep centers at 0.60 and 0.86 eV display strong localization of electronic states, the center with the 0.25-eV activation energy is associated with defects for which the major part of the localizing potential extends uniformly in space over several unit cells. Such centers are assumed to originate from twinning-induced extended defects.     

Temperature Dependence of Autowave Characteristics of Localized Plasticity

Physics of the Solid State - The behavior of localized plastic flow autowaves in a Fe–Ni–Cr alloy at temperatures 143 K ≤ T ≤ 420 K is considered. The temperature variation...     

Relation of the Lattice and Deformation Characteristics at Plastic Flow of Metals

Russian Physics Journal - A new approach is suggested for explanation of autowave processes during plastic deformation of metals. It is based on the postulate that a quasiparticle corresponds to a...     

One approach to solving a discrete production planning problem with interval data

In this paper, we develop an approach to solving integer programming problems with interval data based on using the possibilities of varying the relaxation set of the problem. This is illustrated by means of an L-class enumeration algorithm for solving a dicrete production planning problem. We describe the algorithm and a number of its modifications and present results of a computational experiment for families of problems from the OR Library and with randomly generated initial data. This approach is also applied to obtain approximate solutions of the mentioned problem in its conventional setting.     

Oligomerization of higher olefins and alkylation of toluene catalyzed by 2-[hydroxy(diaryl)methyl]-8-hydroxyquinoline oxovanadium(v) complexes

Russian Chemical Bulletin - New oxovanadium(V) complexes with 2-[hydroxy(diaryl)methyl]-8-hydroxyquinoline ligands were synthesized. These compounds were found to be efficient tandem catalysts of...