Dimeric flavanols ofJuniperus sabina. I
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Procyanidins B2, B3, and B4 have been isolated fromJuniperus sabina for the first time. On the basis of chemical transformations and the PMR spectroscopy of their decaacetates, and absolute configurations of the asymmetric centers of each of the halves of the molecules of the dimer have been determined: 2R, 3R, 4R for the “upper” half and 2R, 3R for the “lower” half of B2, 2R, 3S, 4S for the “upper” half and 2R, 3S, for the “lower” half of B3; and 2R, 3S, 4S for the “upper” half and 2R, 3R for the “lower” half of B4.
KeywordsCatechin Epicatechin Raney Nickel Siberian Larch Asymmetric Center
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