Finite motion of massive particles in the Kerr and Schwarzschild fields

In the weakly relativistic limit, an expression is obtained for the damping of quasistationary energy levels in Schwarzschild and Kerr fields due to capture by a collapsar. The strength of the damping in the Schwarzschild field decreases strongly with increasing angular momentum of the particle. If the condition < m_H is satisfied in the case of a rotating black hole, the damping can be replaced by excitation. A particle production process (Hawking process) is considered that leads to the accumulation of particles on quasistationary levels near the black hole. Dynamical equilibrium can be established in the system between the processes of production and capture of particles by the black hole.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, 109–114, September, 1978.     

1H and13C spectra of biologically active compounds X. Two-dimensional HH COSY 45° and CH HET CORR spectra of the 18α- and 18β-isomers of glycyrrhetic acid 3-acetate

An assignment of¹H and¹³C NMR signals has been made by the methods of homonuclear two-dimensional spectroscopy, HH COSY (45°), and heteronuclear correlation spectroscopy, CH HET CORR. It has been shown that the range of diastereomeric effects in the¹³C NMR spectra substantially exceeds the effects due to solvents, in contrast to the proton spectra in which these ranges overlap.Institute of Chemistry, Bashkir Scientific Center, Urals Branch, Academy of Sciences of the USSR, Ufa. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 363–368, May–June, 1991.     

A new phytoecdysteroid

A new phytoecdysteroid,viz, 2-deoxy-3-epi-4β, 20-dihydroxycedysone ((20R,22R)-3α,4β 14α,20,22,25-hexahydroxy-5β-cholest-7-en-6-one), named coronatasteronc, was isolated fromSerratula coronata and identified by NMR spectroscopy. Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 1954–1955, November, 2000.     

Synthesis of optically active analogs of α-tocopherol based on (S)-(+)-dihydromyrcene

New optically active analogs of α-tocopherol (vitamin E) were synthesized starting from enantiomerically enriched (ee≈50%) (S)-(+)-dihydromyrcene. Published inIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1631–1634, September, 2000.     

Synthesis and transformations of metallacycles. 27. Quantum-chemical study of the mechanism of styrene catalytic cyclometallation with triethylaluminum in the presence of Cp2ZrCl2

Cyclometallation of olefins with AlEt₃ in the presence of Cp₂ZrCl₂ affording five-membered monosubstituted cyclic organoaluminum compounds, was studied by the semiempirical quantum-chemical PM3 method. The proposed model of catalytic cycloalumination of styrene catalyzed by Cp₂ZrCl₂ is in a good accordance with experimental data obtained by dynamic NMR spectroscopy.     

Tetrakispyridinium Derivative of Perfluorosuccinic Acid Dimer

Russian Journal of Organic Chemistry -     

Synthesis of 20-hydroxyecdysone oxime, its diacetonide, and their 14,15-anhydro derivatives

20-Hydroxyecdysone oxime, its diacetonide, and the corresponding 14,15-anhydro derivatives were synthesized. Conditions were found for the preparation of the Z-and E-oximes, and their characteristics ¹H and ¹³C NMR parameters were determined.     

Molecular and crystal structure of 2-(2-methyl-2-propenyl)-1,3-cyclopentanedione (C9H12O2)

An x-ray crystal structure study of 2-(2-methyl-2-propenyl)-1,3-cyclopentane-dione (C₉H₁₂O₂) has been carried out. It has been shown that in the solid this compound occurs exclusively in the enol form. The molecules are bound together by strong hydrogen bonds and form infinite chains along the b-axis. According to the spectroscopic data (¹H and¹³C NMR), the same compound in solution has a mesomeric structure.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1794–1797, August, 1991.     

Effect of induced radiation of electrons moving in a plane electromagnetic wave on their spin orientation

The induced radiation of electrons moving in a plane, monochromatic, circularly polarized wave leads to a predominant orientation of the electron spin. Under certain conditions an electron beam can become completely polarized.Translated from Izvestiya VUZ. Fizika, No. 8, pp. 54–58, August, 1970.