Lichens and fungi. XV. Revised structures for hopane triterpenoids isolated from the lichen Pseudocyphellaria mougeotiana

Abstract

The hopane triterpenoid in the extractives from P. mougeotiana, reported in Part VII¹ of this series as hopane-6α,7α,22-triol, is now shown to be hopane-6α,7β,22-triol (1j). There is a consequential revision of the two triol diacetate structures to hopane-6α,7β,22-triol 7-acetate (1i) and hopane-6α,7β,22-trio1 7-acetate (1h). In addition the diol reported as hopane-11β,22-diol has now been shown to be a mixture of hopane-7β,22-diol (1b) and hopane-15α,22-diol (1e). Hopane- 7β,22-diol 7-acetate (1f) and hopane-15α,22-diol 15-acetate (1g) have also been identified in the extractives.