Further Studies of the Terpenoid Content in the Gorgonian Eunicea succinea: 12,13-Bisepieupalmerin, a New Cembranolide

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Abstract
In a continuing comparative study of the sesquiterpenoid and diterpenoid content of the gorgonian Eunicea succinea from different locations, a new cembranolide, 12,13-bisepieupalmerin (6), was isolated (structure by X-ray analysis) from specimens from St. Croix, U.S.V.I. [USA Virgin Islands]. 12,13-Bisepieupalmerin possesses the correct stereochemistry to be a biosynthetic precursor for the related cembranolides eunicin and jeunicin. The latter compounds occurred with 6 in E. succinea from St. Croix. Eunicin and its acetate were obtained from a South Caicos collection. E. succinea from St. Croix, U.S.V.I. and South Caicos contained complex mixtures of hydrocarbons in which (.sbd.)-germacrene-A, (+)-.beta.-elemene, (+)-.beta.-epibourbonene, (+)-.beta.-copaene and (+)-.alpha.-muurolene were identified.

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