The Biosynthetic Origin of the Central One-Carbon Unit of Phenylphenalenones inAnigozanthos preissii

Abstract
The biosynthetic origin of all 19 carbon atoms of the phenyl-phenalenones was established by 13C NMR analysis of hydroxyanigorufone, isolated from cultured roots of Anigozanthos preissii after administration of 13C labelled precursors. High incorporation of C-2 of [2-13C]acetate into the central carbon atom for the first time unambiguously proved the origin of this C1 unit of phenylphenalenones.