The relative stereochemistry of a furanosesquiterpene, reported previously
from myrrh, but isolated here from Commiphora sphaerocarpa is determined fo
r the first time as (1(10)E,2R*,4R*)-2-methoxy-8,12-epoxygermacra-1(10),7,1
1-trien-6-one. Likewise the stereochemistry of furanodienone was establishe
d by NMR and X-ray crystallography as (1(10)E,4E)-8,12-epoxygermacra-1(10),
4,7,11-tetrean-6-one. (C) 2000 Elsevier Science Ltd. All rights reserved.