Abstract
Three new flavonoids (hoslundin 1, hoslundal 4, and hoslunddiol 6) have been isolated from the twigs of Hoslundia opposita. The structure of hoslundin has been determined mainly by the use of 2D n.m.r. long-range δ C/δ H correlation in conjunction with the ID proton-coupled 13C n.m.r. spectrum, while the structures of the rest were established using 1H and 13C n.m.r. spectroscopy. The manner in which 2D n.m.r. long-range δ C/δ HH correlation experiments are used for determining bond connectivity during the process of structural elucidation is discussed.
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