It is shown, by 2H n.m.r. spectroscopy, that in the biosynthesis of poriferasterol in Ochromonas malhamensis the hydrogen atom at C-28 arising from S-adenosylmethionine assumes the 28-pro-S position, whereas the hydrogen atom coming from the reducing system assumes the 28-pro-R position.
F. Nicotra, B. M. Ranzi, F. Ronchetti, G. Russo and L. Toma, J. Chem. Soc., Chem. Commun., 1980, 752 DOI: 10.1039/C39800000752
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