Chirality & Odour Perception
John C. Leffingwell, Ph.D.

The alpha-Dihydroionones

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Photo by permission of M. Roudintska - Art & Parfum

(R)-(+)-Dihydro-alpha-ionone - Floral, violet-type odor with slightly fruity aspects. Also possesses a woody side, but less pronounced than in dihydro-beta-ionone.

Odor Threshold = 31 ppb in air

= (1'R)-(+)-4-(2',6',6'-Trimethyl-cyclohex-2-enyl)-butan-2-one

 Ref: Elisabetta Brenna, Claudio Fuganti, Stefano Serra, and Philip Kraft, Optically Active Ionones and Derivatives: Preparation and Olfactory Properties, Eur. J. Org. Chem. 2002, 967-978

(S)-(-)-Dihydro-alpha-ionone - Exhibits a floral orris-type odor, with woody aspects and a distinct honey note.

Odor Threshold = 100 ppb in air

= (1'S)-(-)-4-(2',6',6'-Trimethyl-cyclohex-2-enyl)-butan-2-one

 Ref: Elisabetta Brenna, Claudio Fuganti, Stefano Serra, and Philip Kraft, Optically Active Ionones and Derivatives: Preparation and Olfactory Properties, Eur. J. Org. Chem. 2002, 967-978

Cyclic Terpenoid Odorants

Bicyclic Terpenoid Odorants

Acyclic Terpenoid Odorants

Ionones, Irones, Damascones & Structurally Related Odorants

Acyclics (Alcohols, Esters, Acids, Aldehydes)

Lactones

Sesquiterpenoid Related Odorants

Steroid Urine Type Odorants

Sandalwood Type Odorants

Musk Odorants

Miscellaneous

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