Abstract
Carbon-13 n.m.r. signal assignments for D:A-friedooleanan-28-ol (1), D:A-friedooleanan-29-ol (2), D:A-friedooleanan-30-ol (3)D:a-friedooleanan-30-ol (4, D:A-friedooleanan-21α-ol (5) and 21α- hydroxy-D:A-friedooleanan-3-one (6) are reported. Lanthanide-induced shifts of the hydroxy compounds indicate that the oxygenation in the vicinity of ring E in these molecules does not affect the chair-chair-chair-twistboat-boat conformation proposed for D:A-friedooleananes.
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