Cluster <Emphasis Type="Italic">ab initio</Emphasis> calculations for the C<Subscript>60</Subscript>F<Subscript>24</Subscript>, C<Subscript>60</Subscript>Cl<Subscript>24</Subscript>, and C<Subscript>60</Subscript>Br<Subscript>24</Subscript> halofullerenes

This paper reports on ab initio cluster calculations of the equilibrium geometry, electronic structure, and vibrational properties of the C₆₀, C₆₀F₂₄, C₆₀Cl₂₄, C₆₀Br₂₄ molecules.     

The formation of 1,2-disubstituted adamantanes during the acylation of monosubstituted alkynes with derivatives of 1-adamantanecarboxylic acid

Conclusions It has been demonstrated, by taking the acylation of a number of monosubstituted alkynes by derivatives of 1-adamantanecarboxylic acid as the example, that the process mainly leads to the formation of 1,2-disubstituted ketones which correspond to a 1,5-hydride shift in the vinyl cationoid intermediate.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 835–840, April, 1979.     

Synthesis of 4-hydroxy-5-methyl-2-[2-(4-oxo-4<Emphasis Type="Italic">H</Emphasis>-chromen-3-yl)ethenyl]-6<Emphasis Type="Italic">H</Emphasis>-1,3-oxazin-6-ones and their reaction with hydrazine

4-Hydroxy-6H-1,3-oxazin-6-ones containing a 3-vinylchromone fragment in the 2-position were synthesized. The direction of their reactions with hydrazine hydrate was found to depend on the solvent nature. The reaction in protic solvents (methanol, acetic acid) resulted in recyclization of both oxazine ring to 1,2,4-triazole and pyranone ring to pyrazole. Aprotic acetonitrile favored attack of hydrazine exclusively on the oxazine ring, while the 3-vinylchromone fragment remained intact.     

First Heat and Particles Transport Study in the Globus-M2 Spherical Tokamak with Neutral Beam Injection at the Current Ramp-Up

Technical Physics - The article presents the results of studying the transfer of heat and particles in the Globus-M2 spherical tokamak in discharges with neutral injection at the current ramp up....     

A resonance case of the existence of solutions of a quasilinear second-order differential system, which are represented by Fourier series with slowly varying parameters

For a quasilinear second-order differential system, whose coefficients have the form of Fourier series with slowly varying coefficients and frequency, we prove, under certain conditions, the existence of a particular solution having a similar structure. This result is obtained in the case where the characteristic equation possesses purely imaginary roots, which satisfy a certain resonance relation. Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 51, No. 2, pp. 285–288, February, 1999.