Analogs of carbohydrate-metabolism coenzymes

Conclusions We synthesized two analogs of the natural coenzyme adenosine diphosphate glucose: N₆-methyl-ADPG and N₆, N₆-dimethyl-ADPG.For communication 11, see [1].The following abbreviations are used in this article: ADPG) adenosine-5'-diphosphate-a-D-glucopyranose; N₆-methyl-ADPG) N₆-methylamino-9--D-ribofuranosylpurine-5-diphosphate--D-glucopyranose; N₆, N₆-dimethyl-ADPG) N₆, Ng-dimethylamino-9--D-ribofuranosylpurine-5-diphosphate--D-glucopyranose.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2514–2521, November, 1969.     

New method of reducing lactones and esters of aldonic acids to sugars

Summary A simple, general method of reducing esters and lactones of aldonic acids to sugars by the action of sodium amalgam, according to which the process is conducted in the presence of a strong cation exchange resin to maintain optimum pH, has been proposed.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya No. 11, pp. 2095–2096, November, 1964     

Reaction of nitro compounds with iminium salts 1. Nitrovinylation of indoles

Conclusions Iminium salts prepared from indoles, thionyl chloride, and dimethylformamide readily form the corresponding nitrovinyl derivatives by nucleophilic attack on the anion of an aliphatic nitro compound.Translated from Izvestiya Akademiya Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2310–2313, October, 1977.     

Oxidation behaviour of nickel silicides investigated by AES and XPS

The oxygen interaction with Ni silicide surfaces in a wide range of composition, from NiSi₂ to Ni₃Si, has been investigated at room temperature by AES and XPS techniques. It has been found that the Si oxidation is enhanced over that of pure Si in all the Ni-Si compounds, and that the strongest oxidation occurs in Ni richer silicides. In general, oxygen bonds with Si leaving the metal unoxidized, but in Ni₃Si evidence for the occurrence of Ni oxidation has been found at high exposures.     

Effect of a Cocurrent Gas Flow on the Velocity and Concentration Limits of Combustion Wave Propagation in Granulated Ti + C + <Emphasis Type="Italic">x</Emphasis>Al<Subscript>2</Subscript>O<Subscript>3</Subscript> Mixtures

In this paper, we studied the effects of a cocurrent gas flow on the velocity and combustion limits of a granulated Ti + C mixture diluted with inert corundum granules. In the whole range of dilutions, an increase in the combustion rate was observed for the flow of active and inert gases. This effect is several times greater than that calculated based on the filtration combustion theory. Concentration combustion limits (75 wt %), the incomplete combustion of Ti + C granules, and the ratio of the combustion rates of the undiluted mixture and the mixture at the propagation limit (from 2 to 3) are well predicted by the percolation theory. The same combustion limit of concentration in the flow of inert and active gases and without flow indicates a percolation-phase transition as the reason for the cessation of combustion.     

Triterpenoid saponins Communication 16. Structure of araloside C

Summary The complete structure of araloside C — a triterpenoid saponin from the roots ofAralia manshurica (Rupr. et Mey) — was established.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimisheskaya, No. 7, pp. 1214–1222, July, 1965     

Glycosides from ginseng roots IV. Isolation of new glycosides from ginseng

Summary 1. New glycosides — panaxosides C, D, E, and F — have been isolated from the root of ginseng by partition chromatography.2. The glycosides of ginseng contain genins of two groups: the first consists of the genins of panaxosides A, B, and C, and the second of those of panaxosides D, E, and F. When panaxosides D, E, and F are hydrolyzed, panaxadiol is formed as the main product of the decomposition of the genins.Khimiya Prirodnykh Soedinenii, Vol. 1, No. 2, pp. 82–86, 1965