Cyclocondensation of 2-Fluoro-5-nitrobenzaldehyde with Amidines. New Synthesis of Isoquinolines

The direction of the cyclocondensation of 2-fluoro-5-nitrobenzaldehyde with five amidines having -hydrogen atoms has been studied. It was established that depending on the structure of the amidine the main products of the reaction may be not only quinazolines but also 3-aminoisoquinolines. A new convenient route has been found for the synthesis of 3-aminoisoquinolines consisting of the cyclocondensation of -acylacetamidines with 2-fluoro-5-nitrobenzaldehyde.     

Methyl alcohol associated-ion formation and decomposition in field ionization

A study has been made on the formation of methyl-alcohol associated ions by field desorption and by quantum-chemical methods (SCF MO LCAO in the CNDO/2 valency approximation). Field desorption can be used to determine molecular interaction characteristics because the electric field has the role merely of ionizing the products.Translated from Teoreticheskaya i Èksperimental'naya Khimiya, Vol. 25, No. 6, pp. 653–659, November–December, 1989.     

Clarification of kaolin suspension and turbid natural water in the presence of Praestols and aluminum sulfate and aluminosilicate coagulants

The kinetics of clarification of a kaolin suspension and turbid natural water in the presence of coagulants (aluminum sulfate and aluminosilicate) and flocculants (nonionic, cationic, and anionic Praestols) was studied in relation to the concentrations of coagulants and flocculants.     

Sedimentation of Kaolin Suspension in the Presence of Praestol Anionic Flocculant and Aluminum Polyoxychloride and Sulfate Coagulants

The kinetics of sedimentation of kaolin suspension in the presence of coagulants (aluminum polyoxychloride and sulfate) and Praestol anionic flocculant was studied, as influenced by the concentrations of coagulants and flocculant, mode and time of their addition into the suspension, composition of the coagulant mixture, and chemical structure and conformation of flocculant macromolecules.     

Study of group IV–VI B metal extraction by easily melting acid extractants

The melt extraction of Ti, Zr, Hf, Nb, Cr and Mo with β-diketones in naphthalene-biphenyl eutectics has been studied and the temperature dependence of the equilibrium constants obtained. X-ray fluorescence determination of the elements in the solidified organic extract is convenient.     

Erratum to: Antitumor activity of carboplatin in the composition of a copolymer of lactic and glycolic acids

Russian Chemical Bulletin - To the article “Antitumor activity of carboplatin in the composition of a copolymer of lactic and glycolic acids,” by E. D. Nikolskaya, O. A. Zhunina, N. G....     

Measurement of Dispersion Characteristics of Integrated Optical Microresonators and Generation of Coherent Optical Frequency Combs

Journal of Experimental and Theoretical Physics - Optical frequency combs are a unique tool for fundamental metrology, spectroscopy, and a broad spectrum of applications. High-Q microresonators...     

Effect of Na+ and Ca2+ ions on the photochemical formation of hydrogen peroxide in frozen aqueous solutions of adenine derivatives

Russian Journal of Physical Chemistry A - The content of hydrogen peroxide is determined in NaCl-containing (0.001–0.1 M) aqueous solutions of adenosine-5'-diphosphate (ADP) and adenosine...     

Photocatalysts based on aluminum and zinc phthalocyanines supported on modified montmorillonite

The efficiency of the sensitizing action of photocatalysts prepared from montmorillonite modified by a cationic surfactant and treated with aluminum and zinc phthalocyanines was studied. The rates and quantum yields of acceptor (9,10-diphenylanthracene) consumption upon irradiation with the visible light of poly(methyl methacrylate) films and dispersions in toluene containing the photocatalysts were determined. The quantum yields of singlet oxygen generation were estimated on the basis of these data. The influence of the medium and concentration of phthalocyanines on the spectral characteristics of the photocatalysts was considered.