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The ketolactone C12H16O3 discovered by NAVES & GRAMPOLOFF [3] in 1942 in an Italian jasmine oil is shown to be the lactone IV of 2‐(5‐hydroxy‐cis‐pent‐2‐enyl)‐3‐oxo‐cyclopentylacetic or 5′‐hydroxy‐jasmonic acid (V ). Contrary to the findings of NAVES & GRAMPOLOFF, this hydroxy‐acid does not lactonize spontaneously, and the ketolactone IV has no odour.
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Demole et al. (1964) studied this question.
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