%0 Journal Article %A Ghisalberti, EL %A Jefferies, PR %A Mori, TA %T The Chemistry of Eremophila Spp. XXV. New Cembrene Derivatives From E. dempsteri, E. platycalyx and E. fraseri %J Australian Journal of Chemistry %D 1986/10/01 %V 39 %N 10 %P 1703-1710 %K %R https://doi.org/10.1071/CH9861703 %U https://www.publish.csiro.au/paper/CH9861703 %X The isolation and structural elucidation of three new cembrene diterpenes from Eremophila species is reported. (1R,3Z,7E,11Z)-15- Hydroxycembra-3,7,11-trien-19-oic acid (3) and (1R,3Z,8ξ,11Z)-15- hydroxycembra-3,11-dien-19-oic acid (4) were isolated from E. dempsteri and (1R,3S,4R,7E,11Z)-3,15-epoxy-19-oxocembra-7,11-dien-18-ol as the malonate half ester derivative (15) was isolated from E. Platycalyx and a variety of E. Fraseri. In addition the preparation of (1R,3Z,7Z,11Z)- cembra-3,7,11,15-tetraene (13; all- cis-cembrene-A ) is reported.