Abstract
AbstractThe resonances of C‐26 and C‐27 in the 13C NMR spectra of two (24β)‐ethylsterols, poriferasterol and clionasterol, were unambiguously assigned through a biosynthetic experiment from [1,2‐13C2]acetate in the chrysophyte Ochromonas malhamensis; the conclusion that the hydride migration from C‐24 to C‐25 during the biosynthesis of phytosterols occurs in most cases on the si‐face of the 24‐double bond precursor is experimentally established.
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