Diffractive vector meson production at HERA: From soft to hard QCD

Experimental results from HERA on diffractive vector meson production and their theoretical interpretation within microscopic QCD are reviewed with an emphasis on the BFKL color dipole and k _T -factorization approaches. The text was submitted by the authors in English.     

Kinetics and products of the reaction of diazo compounds with SO2

Data were obtained on the composition of products and kinetics of the reaction of SO₂ with Ph(R)CN₂ (R=Ph, Me) in solutions of isooctane, 1,4-di-oxane, and ethanol at 295 K. A mechanism was proposed for the process in accordance with which the sulfene being formed participates in concurrent reactions with the starting reagents. The relative rate constants for the process stages were determined.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2496–2500, November, 1990.     

Activating Mixing in Modification of Rubbers in Solution

The applicability of the previously developed principles of activating mixing to modification of rubbers in solutions was tested, and a process was developed for mechanochemical modification of cis-1,4-polyisoprene in rotary pulsation apparatus.     

The chemical synthesis of beta-(1-->4)-linked D-mannobiose and D-mannotriose

A D-cellobiose derivative was converted to D-mannobiose via simultaneous epimerization at C-2 and C-2'. Subsequent beta-D-glucosylation and epimerization at C-2" gave D-mannotriose.     

Photolysis of 5-diazo-2,2-dimethyl-4,6-dioxo-1,3-dioxane (diazoisopropylidenemalonic acid)

The principal pathway in the photochemical ( > 210 nm) transformation of 5-diazo-2,2-dimethyl-4,6-dioxo-1,3-dioxane in an aqueous medium (or in methanol) is splitting out of nitrogen and the Wolff rearrangement to give the stable 2,2-dimethyl-5-oxo-1,3-dioxolane-4-carboxylic acid (or its methyl ester), which undergoes decarboxylation only at temperatures above 150 ° C, whereas it undergoes hydrolysis to a hydroxymalonic acid in the presence of trifluoroacetic acid.Communication 6 from the series Chemistry of diazo dicarbonyl compounds. See [1] for Communication 5.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 321–325, March, 1985.     

Synthesis of bacterial antigenic polysaccharides and their fragments V. Use of 1,2-o-isopropylidene-4,6-O-ethylidene-α-D-galactopyranose for the synthesis of oligosaccharides with 3-o-substituted galactopyranose residue

Conclusions Trisaccharide-D-glucopyranosyl-(14)--L-rhamnopyranosyl-(1 3)-D-galactose was synthesized by using, 2-O-isopropylidene-4,6-O-ethylidene--D-galactopyranose for producing 1 3-rhamnosylgalactose, linkage.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1609–1613, July, 1977.     

Methane Pyrolysis Stimulated by Admixture of Atomic Hydrogen: 1. An Experimental Study

A method for enhancing the hydrocarbon pyrolysis process by introducing atomic hydrogen into the reaction medium from an arcjet plasma source was considered. It was shown that hydrogen atoms could effectively be introduced by mixing under low pressure. The atomic hydrogen–stimulated methane pyrolysis process was experimentally studied in a continuous stirred reactor with a plasma plume. When hydrogen atoms were present in the plasma jet, the amount of the valuable product increased by a factor of two.     

Reaction of tetracyanoethylated ketones with aldehydes. Synthesis of 3-imino-2,6-dioxabicyclo[2.2.2]octanes

The products of the addition of tetracyanoethylene to ketones react smoothly with aliphatic, aromatic, and heterocyclic aldehydes to give 4,8,8-tricyano-3-imino-2, 6-dioxabicyclo[2.2.2]octanes. The structures of the reaction products were confirmed by ¹³C, IR, and mass spectral data.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1462–1466, November, 1984.