(-)-(R)-2-methoxy-3-[1-methylpropyl]pyrazine - a burdock like, green and earthy odor; Qualitatively, there is no significant difference between the organoleptic properties of the (S)-(+)-, (R)-(-) enantiomers or the racemate but the (-)-(R)-2-methoxy-3-[1-methylpropyl]pyrazine appears to have a somewhat more burdocklike aroma than its antipode. Odor threshold = 0.01 ppb Ref: Satoru Mihara, Hideki Masuda, Osamu Nishimura, and Hideki Tateba, Determination of the Enantiomeric Composition of 2-Met hoxy-3-(1'-methylpropyl) pyrazine from Galbanum Oil Using Achiral and Chiral Lanthanide Shift Reagents, J. Agric. Food Chem. 1990, 38, 465-467

(+)-(S)-2-methoxy-3-[1-methylpropyl]pyrazine - a burdock like, green and earthy odor Odor threshold = 0.1 ppb This is the natural isomer of Galbanum Ref: Satoru Mihara, Hideki Masuda, Osamu Nishimura, and Hideki Tateba, Determination of the Enantiomeric Composition of 2-Met hoxy-3-(1'-methylpropyl) pyrazine from Galbanum Oil Using Achiral and Chiral Lanthanide Shift Reagents, J. Agric. Food Chem. 1990, 38, 465-467

Ionones, Irones, Damascones & Structurally Related Odorants

Acyclics (Alcohols, Esters, Acids, Aldehydes)

Lactones

Sesquiterpenoid Related Odorants