Abstract
The structure of apakaochtodene A, the minor isomer of two tetrahalogenated ochtodene monoterpenes, isolated from the red marine alga Portieria hornemannii (Lyngbye) Silva has been identified as 6(S)-bromo-1,4(S),8(R)-trichloro-2(Z)-ochtodene (1) by NMR spectral and X-ray crystallographic analysis. Its geometrical isomer, apakaochtodene B (2), which could not be separated from 1 and thus characterized as a 95:5 mixture of 2:1 had (1)H and (13)C NMR spectral characteristics similar to previously known ochtodene (3) and the related tetrahalogenated monoterpene 4.
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