DIMERIC FLAVANOLS OF Juniperus sabina. I.

Article abstract of DOI:10.1007/BF00580451

Procyanidins B₂, B₃, and B₄ have been isolated from Juniperus sabina for the first time.On the basis of chemical transformations and the PMR spectroscopy of their decaacetates, and absolute configurations of the asymetric 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" haalf of B₄.