(-)-(6R)-3,4-Didehydro-7,8-dihydro-gamma-ionone - weaker on blotter than (+)-(S)-isomer, fruity, agrestic, floral, ionone- and damascone-like, slightly woody, and saffron-like Odor threshold = 99.4 ng/L in air = (-)-4-[(1R)-6,6-dimethyl-2-methylenecyclohex-3-en-1-yl]butan-2-one Ref: Stefano Serra, Claudio Fuganti, and Elisabetta Brenna, Synthesis, Olfactory Evaluation, and Determination of the Absolute Configuration of the 3,4-Didehydroionone Stereoisomers, Helvetica Chimica Acta, Vol. 89 (2006), 1110-1122.

(+)-(6S)-3,4-Didehydro-7,8-dihydro-gamma-ionone - stronger on blotter than (-)-(R)-isomer, woody-powdery, ionone, slightly fruity-floral, more pronounced ionone character than (-)-(R)-isomer. Odor threshold = 92 ng/L in air = (+)-4-[(1S)-6,6-dimethyl-2-methylenecyclohex-3-en-1-yl]butan-2-one Ref: Stefano Serra, Claudio Fuganti, and Elisabetta Brenna, Synthesis, Olfactory Evaluation, and Determination of the Absolute Configuration of the 3,4-Didehydroionone Stereoisomers, Helvetica Chimica Acta, Vol. 89 (2006), 1110-1122.

Ionones, Irones, Damascones & Structurally Related Odorants

Acyclics (Alcohols, Esters, Acids, Aldehydes)

Lactones

Sesquiterpenoid Related Odorants