Synthesis of aromatic derivatives of 1,5-benzodiazepine in the reaction of 4-nitro-o-phenylenediamine with chalcone dibromides

The reaction of 4-nitro-o-phenylenediamine with 4-nitro-4-R-chalcone dibromides affords the corresponding -(2-amino-4-nitroanilino)chalcones; x-ray diffraction data indicate that these are the Z-isomers. Experiments have been perfortned to determine the conditions required for cyclization of these compounds into 2, 4-diaryl7(8)-nitro-1, 5-benzodiazepines. In the solid phase or in ethanol solutions, these latter compounds exist primarily in the 3H tautomeric form; but in DMSO solutions, the 1H form predominates.Khar'kov State University, Khar'kov 310077. Institute of Heteroorganic Chemistry, Russian Academy of Sciences, Moscow 117813. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 950–958, July, 1995. Original article submitted June 30, 1994; revision submitted April 3, 1995.Deceased     

Characterization of two irradiation positions for fission track dating at the Lena Triga Mark II reactor

In the present paper the use of two natural uranium dosimeters is described. Data are compared with fluence values obtained by using NIST glass standards and the traditional activation of metal foils. Finally an example is reported for application of neutron dosimetry to the dating of the Fish Canyon Tuff age standard.     

Comparative structural stability of natural clays and zeolites in contact with60Co2+ aqueous solutions

The ability of synthetic and natural Mexican zeolites and clays to remove radioactive Co from aqueous solutions is discussed. In the various samples, crystallinity was determined by X-ray diffraction. The amount of radionuclide sorbed by the aluminosilicates was determined by -spectrometry.     

Investigations on the determination of NO2 with galvanic nitrate solid electrolyte cells

Solid electrolyte cells for detecting NO₂ with Ba(NO₃)₂ or Sr(NO₃)₂ partially replaced by -Al₂O₃ as solid electrolytes have been studied. The cell tension depends on the NO₂- as well as on the NO-concentration. Investigations of the establishment of the NO₂-NO-O₂-equilibrium by the catalytic effects of the used electrode materials Pt and Au have shown that a decomposition of NO₂ below 400°C cannot be expected.17th Communication on oxoanionic solid electrolytes and their possible applications; 16th Communication see Solid State Ionics 51:183–185 (1992)Extension of a part of the lecture of V. Brüser, S. Jakobs, H.-H. Möbius and U. Schönauer Galvanische NO₂-Sensoren mit Nitrat-Festelektrolyten given in Feldberg, 3. 6. 1993     

Scientific Centers of the World N. D. Zelinsky Institute of Organic Chemistry of the Russian Academy of Sciences

Information

Congresses, Conferences, Symposia, Meetings, and Seminars held in 1994     

Forced vibrations of laminated materials with a stochastic structure

S. P. Timoshenko Institute of Mechanics of the Ukrainian Academy of Sciences, Kiev. "Energiya" Scientific-Industrial Association, Moscow. Translated from Prikladnaya Mekhanika, Vol. 30, No. 5, pp. 24–31, May, 1994.     

Planar oscillations and dissipative heating of viscoelastic plates with a piezoeffect

Planar oscillations of thin piezoplates are important within the context of using this type of piezoelements as resonator frequency filters, frequency stabilizers, elements of piezotransformers, and other technological devices. In the publications currently known one usually considers piezoplates with elastic material behavior and linear governing equations. By their mechanical nature, however, a number of piezoelements, particularly piezoceramics, are viscoelastic, which, depending on the loading conditions, can lead to substantial dissipative heating of the piezoelement and confine its operation [3]. The use of piezopolymers and their composites raises particularly important issues of dissipative heating. At the present time the behavior of a piezoelement including heating can be described by the theory of thermoelectroviscoelasticity (TEVE) [2, 3], including the interaction between electromechanical and thermal fields. The complexity of TEVE problems leads to the necessity of using numerical methods to solve them, with the finite element method (FEM) being widely used in recent years. The present study is devoted to stating and solving TEVE problems concerning thin piezoceramic plates by the FEM. We treat a thin piezoceramic plate, confined by an arbitrary contour L and polarized across its thickness. A harmonic potential difference e^it is supplied to electrodes located on the smooth boundaries of the plate. Convective heat exchange with the surrounding media of temperatures T _k ^s and T^s is implemented at the contour surfaces and boundaries free of electrodes. The heat transfer coefficients equal, respectively, _k ^T and ^T. The initial plate temperature is T₀. The smooth boundary are free of mechanical loading. The mechanical forces at the contour surfaces are distributed symmetrically with respect to the mean plane of the plate.S. P. Timoshenko Institute of Mechanics, Ukrainian Academy of Sciences, Kiev (Ukraine). Translated from Prikladnaya Mekhanika, Vol. 30, No. 2, pp. 69–76, February 1994.     

Heterocyclizations of 1,3,3-trimethyl-ω-formyl-2-methylene-indoline hydrazones

Reaction of 1,3,3-trimethyl--formyl-2-methyleneindoline with hydrazines can occur to form both linear hydrazones and substituted pyrazoles. The availability of the enamine fragment and the N—H protons in these hydrazones is used in their heterocyclizations with dihalo electrophiles.Institute of Organic Chemistry, Ukrainian Academy of Sciences, Kiev 253094. Translated from Khimiya Geterotsiklicheskikh Soedinenii. No. 7, pp. 915–918, July, 1994.     

Stabilization of the Pro-Tyr-Gly-NH2 melanostatin analog on micelles

Inversed AOT micelles have been used as a system to simulate peptide-receptor interaction; they encapsulate an aqueous solution of the melanostatin analog HCl·Pro-Tyr-Gy-NH₂. NOESY indicates that adsorption at the phase boundary causes the peptide to acquire the biologically active _II conformation. The phenyl ring in Tyr is inserted into the cavity formed by the isooctyl moieties of the AOT molecules.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 29, No. 1, pp. 74–80, January–February, 1993.