4-Hydroxy-2-quinolones. 16. Condensation of N-R-substituted amides of 2-carboxymalonanilic acid with o-phenylenediamine

The reaction of N-R-substituted amides of 2-carboxymalonanilic acid with the equimolar amount of o-phenylenediamine was studied under conditions of thermolysis. It was established that the main products of this reaction are the corresponding amides of benzimidazolyl-2-acetic acid and 1H-2-oxo-3-(benzimidazolyl-2)-4-hydroxyquinoline. Mechanisms of the indicated chemical conversions are discussed. The data on the study of the anticonvulsive activity of the compounds synthesized are presented.For Communication 15, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1105–1108, August, 1993.     

4-hydroxy-2-quinolenes. 24. Improved synthesis and biological properties of hydrochlorides ofβ-dialkylaminoalkylamides of 1-alkyl-2-oxo-4-hydroxyquinoline-3-carboxylic acids

High-purity hydrochlorides of-dialkylaminoalkylamides of 1-R-2-oxo-4-hydroxyquinoline-3-carboxylic acids have been obtained from N-alkyl-2-carbalkoxyanilides of malonic acid. The synthesized compounds have been tested for certain forms of pharmacological activity.For Communication 23, see [1].Ukrainian Pharmaceutical Academy, Khar'kov 310002. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1400–1405, October, 1994. Original article submitted November 8, 1994.     

4-Hydroxy-2-quinolines. 15. Synthesis of N-(2-pyridyl)amides of 1-R-4-hydroxy-2-quinolone-3-carboxylic acids as possible new non-steroidal antiinflammatory agents

Different approaches to the reaction of ethyl 1-R-4-hydroxy-2-quinolone-3-carboxylates with 2-aminopyridine were studied. It was found that the most rational of them is the thermolysis of equimolar amounts of the amine and the corresponding ester. Data on the analgesic and antiinflammatory activity of the amides synthesized are presented.For Communication 14, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1101–1104, August, 1993.     

ATRP grafting of styrene from benzyl chloride functionalized polysiloxanes: An AFM and TGA study of the Cu(0)/bpy catalyst

Various combinations of Cu(0), CuCl, 2,2′-bipyridine (bpy) and 1,10-phenanthroline (phen) were used as catalysts for the grafting polymerizations of styrene from polysiloxane macroinitiators functionalized with benzyl chloride. While Cu(0)/bpy alone promotes the grafting, narrower polydispersities were obtained in the presence of CuCl. Analysis of the Cu(0) surface before and after polymerization by a combination of AFM, TGA and FTIR investigations reveals the formation of bpy or phen films on Cu(0). In the presence of CuCl, the ligand film appears decorated with CuCl particles which increase in size with increasing the CuCl concentration. The initial layer occurs most likely as a result of complexation between the ligands and the Cu(0) surface and acts as a support for the rest of the film. These observations are consistent with the film formation on Cu(0) from related nitrogen donors and indicate that the reactivity of the Cu surface may depend not only on its prior treatment but also on the deposition of ligands from the reaction mixture.     

Cars study of vibrationally excited H2 produced in formaldehyde dissociation

Coherent anti-Stokes Raman scattering (CARS) has been used to observe H₂ from H₂CO + hv H₂ + CO. Photolysis of K = 1 (ortho) lines of the 2¹4¹ S₁ ← S₀ transition produced no para-H₂ (<4% statistical); and demonstrated nuclear spin conservation. H₂ states v = 1, 2 and 3 were comparably populated.     

4-Hydroxy-2-quinolones. 26. Bromination of 3-substituted 2-oxo-4-hydroxyquinolones

The bromination of 3-alkyl- and 3-ethoxycarbonyl-2-oxo-4-hydroxyquinolones by molecular bromine gave 3-bromo-3-R-2,4-dioxoquinolones. Under analogues conditions, 1-R-2,4-dioxo-3H-quinolone-3-carboxylic acids form 1-R-3-bromo-2-oxo-4-hydroxyquinolones. The results of the study of the antimicrobial activity of the compounds synthesized are presented.For Communication 25, cf. [1].Ukrainian Pharmaceutical Academy, Khar'kov, 310002. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 204–207, February, 1995. Original article submitted November 8, 1994.     

Chimera Spectrum Diagnostics for Peptides Using Two-Dimensional Partial Covariance Mass Spectrometry

The rate of successful identification of peptide sequences by tandem mass spectrometry (MS/MS) is adversely affected by the common occurrence of co-isolation and co-fragmentation of two or more isobaric or isomeric parent ions. This results in so-called `chimera spectra’, which feature peaks of the fragment ions from more than a single precursor ion. The totality of the fragment ion peaks in chimera spectra cannot be assigned to a single peptide sequence, which contradicts a fundamental assumption of the standard automated MS/MS spectra analysis tools, such as protein database search engines. This calls for a diagnostic method able to identify chimera spectra to single out the cases where this assumption is not valid. Here, we demonstrate that, within the recently developed two-dimensional partial covariance mass spectrometry (2D-PC-MS), it is possible to reliably identify chimera spectra directly from the two-dimensional fragment ion spectrum, irrespective of whether the co-isolated peptide ions are isobaric up to a finite mass accuracy or isomeric. We introduce ‘3-57 chimera tag’ technique for chimera spectrum diagnostics based on 2D-PC-MS and perform numerical simulations to examine its efficiency. We experimentally demonstrate the detection of a mixture of two isomeric parent ions, even under conditions when one isomeric peptide is at one five-hundredth of the molar concentration of the second isomer.     

Estimates of the Dependence of the Fusion Neutron Yield on the Initial Plasma Density and Temperature in Fast Pinches

JETP Letters - The neutron generation by hot, dense, and fast Z- and Θ-pinch plasma with the parameters achievable at the present development stage of high-power pulsed technology has been...     

Part I. epoxydes diterpeniques : synthese et reactivite d'epoxydes derives d'acides resiniques

Epoxidation of methyl esters of resin acids with the pimarane skeleton with p-nitroperbenzoic acid has permitted the isolation of epoxides of the intracyclic double bond. Allylic diterpenic alcohols were obtained by acid-catalysed isomerisation of diterpene epoxides, and the action of Collins reagent on these allylic alcohols has been studied.     

Nucleophilic reactivity of the peroxide anion in aqueous-alcoholic solutions in the presence of detergents

The reactivity of hydroxide and peroxide anions with 4-nitrophenyl N,N-dimethylcarbamate in aqueous-alcoholic detergent media and in “oil in water” microemulsions has been studied. Aqueous-alcoholic solutions of cationic (CTAB) and neutral (Triton X-100) surface active substances have promise for decomposition of substrates by a nucleophilic mechanism. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 43, No. 6, pp. 358–363, November–December, 2007.