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Synthesis and Odor Description of Both Enantiomers of Methyl 4,5‐Didehydrojasmonate, a Component of Jasmin Absolute

Synthesis of both enantiomers of methyl 4,5‐didehydrojasmonate (1, Δ4,5‐MJA; >99.8% ee), a constituent of jasmin absolute, established the absolute configuration of the natural product, and their odor quality was evaluated. The fragrance of the natural (3S,7R)‐enantiomer (a fresh natural, sweet floral fruity odor, reminiscent of Jasmin and Ylang Ylang flower, more intensive and tenacious) was superior to that of the unnatural (3R,7S)‐enantiomer (a floral green odor with slight metallic green aspect, less intensive than the natural form) and the racemate (green‐floral note, having weak and less volume than methyl jasmonate). Odor difference between natural and unnatural enantiomers of methyl jasmonate (2) is also reported.