Abstract
The sterol composition of two Teucrium species ( abutiloides and betonicum) was studied. Both plants were shown to contain three 24-ethylcholestane derivatives, all of them having the 24β-configuration. These were identified as (24 S)-24-ethylcholesta-5,22( E),25-trien-3β-ol, (24 S)-24-ethylcholesta-5,25-dien-3β-ol (clerosterol) and (24 R)-24-ethylcholesta-5,22( E)-dien-3β-ol (poriferasterol) by spectroscopic analysis of their acetates and by comparison of their physical data (mp, [ α] D) with those reported in the literature for these compounds. Some disagreements in the previously published data of these sterols are clarified and chemotaxonomic aspects are briefly discussed.
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