TY - JOUR A1 - Ghisalberti, EL A1 - Jefferies, PR A1 - Mori, TA T1 - The Chemistry of Eremophila Spp. XXV. New Cembrene Derivatives From E. dempsteri, E. platycalyx and E. fraseri JF - Australian Journal of Chemistry JO - Aust. J. Chem. Y1 - 1986 VL - 39 IS - 10 SP - 1703 EP - 1710 KW - UR - https://doi.org/10.1071/CH9861703 N2 - 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. ER -