Halogenation of the components of nucleic acids

Chemistry of Natural Compounds - Preparative methods have been worked out for the bromination of unprotected deoxy-AMP, deoxy-GMP, and deoxy-CMP and methods have been devised for the isolation and...     

Change of regime in supersonic flow past an obstacle preceded by a thin channel of reduced density

Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 5, pp. 146–151, September–October, 1989.     

Calculation and extrapolation of oscillator strengths in Rb-like,multiply charged ions

The oscillator strengths of dipole transitions between energy levels of the lowest configurations of ions of the Rb I isoelectronic sequence with nuclear charge Z=41–46 are calculated on the basis of the model potential method using an energy approach. For certain ions the reported data are published here for the first time. It is shown that the contribution of core polarization to the oscillator strength attains 15% for some transitions.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 1, pp. 89–92, January, 1996.     

2-[2-(Dimethylamino)vinyl]-6-pentafluorophenyl-4-phenylpyrylium perchlorate and its hydrolysis products: Synthesis and isomerism

2-(2-(Dimethylamino)vinyll-6 pentafluorophenyl-4-phenylpyryliunt perchlorate has been synthesized and it was shown that it is readily converted into 2-fornrylntethylene-6-pentafluorophenyl-4-phenyl-2H-pyran on chromatography on alkaline Al₂O₃. The stereoisornerism of the synthesized compounds has been studied by PMR spectroscopy.Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences (SO RAN) Novosibirsk 630090. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1188–1194, September, 1996. Original article submitted March 29, 1996.