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Components of the ethylacetate extract of <Emphasis Type="Italic">Hedysarum theinum</Emphasis> roots
I. V. Nechepurenko N. P. Polovinka O. I. Sal’nikova L. M. Pokrovskii N. I. Komarova N. F. Salakhutdinov S. B. Nechepurenko 《Chemistry of Natural Compounds》2007,43(1):5-9
Isoflavonoids (-)-medicarpin, (-)-vestitol, and formononetin and butylphenols raspberry ketone and rhododendrol were isolated
for the first time from the ethylacetate extract of Hedysarum thienum roots by column chromatography. GC-MS showed that the ethylacetate extract contained fatty acids, the principal ones being
palmitic, linoleic, oleic, behenic, and lignocerinic.
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Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 6–9, January–February, 2007. 相似文献
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Yarovaya O. I. Korchagina D. V. Salomatina O. V. Polovinka M. P. Barkhash V. A. 《Russian Journal of Organic Chemistry》2003,39(7):985-991
Acid-catalyzed reactions of 2,3-epoxy derivatives of citral (which is a widely spread naturally occurring unsaturated aldehyde) with alcohols were studied under conditions of heterogeneous catalysis and in fluorosulfonic acid. A number of new products were obtained, and possible mechanisms of their formation were proposed. 相似文献
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O. A. Luzina M. P. Polovinka N. F. Salakhutdinov G. A. Tolstikov 《Russian Chemical Bulletin》2007,56(6):1249-1251
The condensation of amino acids with (+)-usnic acid involves the 2-positioned acetyl group of the latter and gives derivatives
containing an enamine fragment.
Dedicated to the memory of Academician N. N. Vorozhtsov on the 100th anniversary of his birth.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1203–1205, June, 2007. 相似文献
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V. V. Bezotvetnykh A. V. Burenin Yu. N. Morgunov Yu. A. Polovinka 《Acoustical Physics》2009,55(3):376-382
Results of an experimental study of low-frequency broadband pulsed signal propagation in a waveguide that includes the shelf zone, the continental slope, and the deep sea region are presented. Using phase-manipulated signals with central frequencies of 366 and 600 Hz, pulsed characteristics are measured at six points along the propagation track, the maximal distance from the source being 368 km. It is experimentally demonstrated that, in the presence of a negative sound velocity gradient in the near bottom layer on the shelf with a small bottom slope, the choice of the source position at the shelf bottom near the shoreline provides the formation of a continuous illumination zone in the deep sea near the USC axis and a stable pulsed characteristic with two main sound energy arrivals. The propagation velocity of the pulse that is last to arrive is identical (within the measurement error) to the velocity of sound on the USC axis at the point of reception. Possibilities for practical application of the results obtained from the experiment are discussed. 相似文献
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O. V. Salomatina O. I. Yarovaya D. V. Korchagina Yu. V. Gatilov M. P. Polovinka V. A. Barkhash 《Russian Journal of Organic Chemistry》2006,42(9):1313-1320
Transformations of diepoxy derivatives of limonene under conditions of homogeneous acid catalysis were studied, and their results were compared with those obtained over heterogeneous catalysts. A number of previously unknown compounds were isolated. The most possible transformation pathways were analyzed by computer simulation using molecular-mechanics and quantum-chemical methods. 相似文献
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I. V. Nechepurenko M. P. Polovinka N. I. Komarova D. V. Korchagina N. F. Salakhutdinov S. B. Nechepurenko 《Chemistry of Natural Compounds》2008,44(1):31-34
Isoflavonoids (−)-medicarpin, (−)-vestitol, formononetin, 8-hydroxydaidzein, and 6″-O-acetylononin were isolated for the first time in addition to (−)-catechin, (−)-epicatechin, protocatechoic acid, raspberry
ketone, and rhododendrol from the alcohol extract of Hedysarum theinum roots.
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Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 26–28, January–February, 2008. 相似文献
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O. A. Luzina M. P. Polovinka N. F. Salakhutdinov G. A. Tolstikov 《Russian Journal of Organic Chemistry》2009,45(12):1783-1789
Reactions of (+)-usnic acid with a number of substituted (halo, alkyl, alkoxy, nitro) phenylhydrazines led to the formation
of the corresponding benzofuro[3,2-f]indazole derivatives or hydrazones at the acetyl group on C2, depending on the initial hydrazine. 相似文献
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