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Communications to the Editor 5519 deuterium oxide produced allogibberic acid containing 4.67% excess deuterium, as expected from a precursor with an 8,9 double bond (c/. gibberellenic acid6 which has the 1•8 system). Strong, but not rigorous, evidence for the (a) stereochemistry in gibberellic acid as in allogibberic acid is given by the close correspondence in shape and intensity of the rotatory dispersion curve form the seco keto esters derived from the oxidation of ring D of methyl allogibberate and of the acetate of methyl adihydrogibberellate ([ ])™/33 + 1070in both cases).Gibberellic acid is therefore la,7•8 subject only to rigorous confirmation of the Cg stereochemistry, (6) K. Gerzon, H. Bird, Jr., and D. Woolf, Jr., Experientia, 13, 487 (1957).(7) The same conclusion has been reached by Cross, et al.t and it was agreed that each group submit its results simultaneously for publication. (8) We wish to thank Dr. L. H. Sarett and Merck, Sharp and Dohme for the generous gift of the Gibberellic acid used in these studies.

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