The Structure and Absolute Stereochemistry of a Halogenated Chamigrene Derivative from the Red Alga Laurencia Species

The structure of a halochamigrene derivative, 2,10-dibromo-3-chlorochamigran-7-en-9-ol, isolated from the red alga Laurencia species has been determined by spectral and chemical methods as well as X-ray crystallographic analysis of the ketone derivative. Furthermore, the conformations of this compound and its derivatives are briefly discussed.