Ring-chain tautomerism of substituted hydrazones. 22. Synthesis,structure, and oxidation of alkylidene derivatives of 2-aminoethylhydrazines

Alkylidene derivatives of 2-aminoethylhydrazines exist in solutions either as 2-aminoethylhydrazones or as the ring-chain tautomeric mixtures of the hydrazone—perhydro-1,2,4-triazine depending on the structure. The oxidation of perhydro-1,2,4-triazines leads to the formation of 2,3,4,5-tetrahydro-1,2,4-triazines.For Communication 21, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1392–1396, October, 1991.     

A glow discharge with a hollow cathode as a source of oscillatory resonance radiation of molecules

Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 53, No. 5, pp. 711–716, November, 1990.     

Low p T phenomena in A+A and p+A collisions at mid-rapidity

CERN experiment NA44 measures pion and kaon distributions at p _T = 0–320 MeV/c at midrapidity in p+A and A+A collisions at 450 and 200A GeV/c, respectively. Pion production from p+Pb and A+A is slightly enhanced at low p _T relative to p+Be, but less than observed at target rapidity. The low p _T behavior can be understood in the context of the RQMD model as arising from baryonic resonance decays.     

N-Amination of 4-Pyrimidones by Mesitylenesulfonyl Hydroxylamine

The 3-amino derivatives are formed exclusively during the amination of the anions of 6-methyl-4-pyrimidones and 2-methyl-4-quinazolone by mesitylenesulfonyl hydroxylamine.     

LowpT phenomena in A+A and p+A collisions at mid-rapidity

CERN experiment NA44 measures pion and kaon distributions atpT=0–320 MeV/c at midrapidity in p+A and A+A collisions at 450 and 200A GeV/c, respectively. Pion production from p+Pb and A+A is slightly enhanced at lowpT relative to p+Be, but less than observed at target rapidity. The lowpT behavior can be understood in the context of the RQMD model as arising from baryonic resonance decays.     

X-ray diffraction study of crystal and molecular structure of acetylacetone azocompound — [C11H11N2O2F1]

The 3-[4-fluorophenylazopentandion]-2,4 reagent is synthesized based on acetylacetone, and its crystal and molecular structure is studied by X-ray diffraction. It is found that [C₁₁H₁₁N₂O₂F] crystals 1 belong to the monoclinic symmetry, C2/c space group. The unit cell parameters of 1 are a = 18.827(3) ?, b = 12.839(2) ?, c = 26.475(5) ?, β = 104.834(2)°. The analysis shows that the reagent is present in the solution as well as in the crystal. A comparative analysis of these three structures with the reported data is carried out.     

Decomposition of hydrogen peroxide in protic and polar aprotic solvents on TS-1 heterogeneous catalyst

Kinetic parameters of H₂O₂ decomposition in methanol, propanol-1, propanol-2, acetone, and acetonitrile at 30–55°C on a TS-1 heterogeneous catalyst were determined. Recommendations are given on choice of solvents in oxidation of organic compounds with hydrogen peroxide.     

Synthesis of sultams by cycloalkylation of (alkoxycarbonylmethane)sulfonanilides

(Methoxycarbonylmethane)sulfonanilides are alkylated by α, ω-dihaloalkanes in K₂CO₃-DMF with the formation of sultams. A high sensitivity has been detected for the reaction rate on the electronic effect of substituents in the aromatic nucleus, although substituents in the ortho position do not obstruct the reaction and in the case of 2,6-disubstituted derivatives the reaction rate and sultam yield were maximal. Tertiary sulfonamides form derivatives of 1-sulfamoylcyclopropanecarboxylic acid under these conditions. __________ Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 605–617, April, 2008.