STEROLS FROM TEUCRIUM ABUTILOIDES AND T-BETONICUM

The sterol composition of two Teucrium species (abutiloides and betoni cum) was studied. Both plants were shown to contain three 24-ethylchol estane derivatives, all of them having the 24 beta-configuration. Thes e were identified as (24S)-24-ethylcholesta-5,22(E),25-trien-3 beta-ol , (24S)-24-ethylcholesta-5,25-dien-3 beta-ol (clerosterol) and (24R)-2 4-ethylcholesta-5,22(E)-dien-3 beta-ol (poriferasterol) by spectroscop ic analysis of their acetates and by comparison of their physical data (mp, [alpha](D)) with those reported in the literature for these comp ounds. Some disagreements in the previously published data of these st erols are clarified and chemotaxonomic aspects are briefly discussed. Copyright (C) 1996 Published by Elsevier Science Ltd