Oxidative decarboxylation of ent-gibberellane-19,20-dioic acids with lead tetra-acetate yields mixtures of 19,10-lactones and 20,4-lactones providing a chemical correlation between the C20 and C19 gibberellins. The oxidation of methyl ent-16-oxo-17-norgibberell-2-ene-7,19,20-trioate with chromium trioxide afforded a 1-ketone which underwent decarboxylation with lithium iodide to afford a 20-norgibberellane with a transA–B ring fusion.
J. R. Bearder, J. MacMillan, C. von Cartenn-Lichterfelde and J. R. Hanson, J. Chem. Soc., Perkin Trans. 1, 1979, 1918 DOI: 10.1039/P19790001918
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