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- W1969001524 abstract "The isolation and characteristics of 12 biosynthetically related metabolites, austalides A–L from cultures of Aspergillus ustus are reported. The structure elucidation of the austalides A–F is based on a detailed study of their high-field 1H and 13C n.m.r. spectra and especially on the three- and two-bond (C,H) connectivity pattern as determined by heteronuclear 13C-{1H} selective population inversion (SPI) experiments. The conformation and relative configuration of austalides A and D were deduced from the observed proton–proton nuclear Overhauser effects (n.O.e.s) and the magnitude of the proton–proton coupling constants. Base-catalysed hydrogen–deuterium exchange on the diketone derivative (18), obtained by Jones oxidation of austalide F, leads to the regio- and stereo-specific incorporation of deuterium atoms at C-12, C-18, and C-21. A mechanism is proposed to explain the incorporation of a deuterium atom at C-21, a position γ to the C-13 carbonyl group." @default.
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- W1969001524 date "1985-01-01" @default.
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- W1969001524 title "Metabolites of Aspergillus ustus. Part 1. Application of the heteronuclear selective population inversion (SPI) n.m.r. technique to the structure elucidation of the austalides A–F, novel ortho ester meroterpenoids" @default.
- W1969001524 doi "https://doi.org/10.1039/p19850000345" @default.
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