Structure of dregeanin and rohitukin, limonoids from the subfamily Melioideae of the family Meliaceae. An unusually high absorption frequency for a six-membered lactone ring

Authors:
  • JCJoseph D. Connolly
    Joseph D. Connolly
  • DODomingo A. Okorie
    Domingo A. Okorie
  • LWL. Dalene de Wit
    L. Dalene de Wit
  • DTDavid A. H. Taylor
    David A. H. Taylor
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Abstract
A new group of limonoids, characterised by the possession of a seven-membered lactone ring A, a secoring B, and a five-membered carbocyclic ring D, has been discovered in the sub-family Meliodieae; a C(1)-C(7) lactone occurring in certain of these is characterised by an unusually high frequency carbonyl absorption in the i.r. spectra.