Natural irones from the essential oil of Iris rhizomes develop by oxidative degradation of C 31 ‐triterpenoids produced by the plant. Two enantiomeric forms of irones are found in Iris , oils of different origin. The optical properties and CD spectra of irones, dihydroirones and their C 31 ‐precursors are reported and their absolute stereochemistry is determined.
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Krick et al. (1984) studied this question.
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