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We report the identification of a range of C25 highly branched isoprenoid (HBI) alkenes and certain sterols in filtered phytoplankton samples obtained from western Svalbard (Arctic) and near South Georgia (South Atlantic, sub-Antarctic) in 2016 and 2014, respectively. The C25 HBIs contained 3–5 double bonds and had structures identified previously from analysis of laboratory diatom cultures. The same...
We report the structures and analytical data for several highly branched isoprenoid (HBI) mono- and di-unsaturated alkenes (monoenes and dienes). This has been achieved by isolating several well characterised HBI dienes from diatom cultures and sediments, and transforming these to structurally related monoenes and other dienes using partial hydrogenation and clay-catalysed, or diphenyl disulphide...
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