(+)-(6R)-alpha-Iso-methylionone (ee = 94%) - typical dry warm ionone note, irisone, clean tea-like, also on blotter more intense and dryer than (-)-enantiomer. Odor threshold = 0.079 ng/L in air = (+)-(R)-8-Methyl-alpha-ionone = (+)-(3E)-3-methyl-4-[(1R)-2,6,6-trimethylcyclohex-2-en-1-yl]but-3-en-2-one Ref: Agnese Abate, Elisabetta Brenna, Claudio Fuganti, Luciana Malpezzi and Stefano Serra, The enantiomers of Iralia®: preparation and odour evaluation, Tetrahedron: Asymmetry 18 (2007) 1145–1153.

(-)-(6S)-alpha-Iso-methylionone (ee = 98%) - about ten times weaker floral note in the direction of iris and ionone, with hesperidic—citric elements and sweet fruity damascone-like aspects. More rich and complex in odour than (+)-enantiomer. Odor threshold = 0.83 ng/L in air = (-)-(S)-8-Methyl-alpha-ionone = (-)-(3E)-3-methyl-4-[(1S)-2,6,6-trimethylcyclohex-2-en-1-yl]but-3-en-2-one Ref: Agnese Abate, Elisabetta Brenna, Claudio Fuganti, Luciana Malpezzi and Stefano Serra, The enantiomers of Iralia®: preparation and odour evaluation, Tetrahedron: Asymmetry 18 (2007) 1145–1153.

Ionones, Irones, Damascones & Structurally Related Odorants

Acyclics (Alcohols, Esters, Acids, Aldehydes)

Lactones

Sesquiterpenoid Related Odorants