(R)-(-)-2-methylbutanal - pungent, caprylic (Boelens, et. al.); Peculiar to burnt cocoa and coffee like (Bartschat et. al) Odor threshold = 0.1 ppm in air Ref: Mans H. Boelens, Harrie Boelens & Leo J. van Gemert, Perfumer & Flavorist, Vol. 18, No. 6, 1-15, 1993 and references therein; Dietmar Bartschat , A. Mosandl, Stereoisomeric flavour compounds LXXX: alkyl-branched alkanals - stereodifferentiation, structure elucidation and structure - function relationship, Z. Lebensm.-Unters. Forsch., 206(3), 165-168 (1998)

(S)-(+)-2-methylbutanal - pungent, fresh, fruity (Boelens, et. al.); Peculiar to burnt cocoa and coffee like, in high concentrations pungent (Bartschat et. al) Odor threshold = 0.01 ppm in air Ref: Mans H. Boelens, Harrie Boelens & Leo J. van Gemert, Perfumer & Flavorist, Vol. 18, No. 6, 1-15, 1993 and references therein; Dietmar Bartschat , A. Mosandl, Stereoisomeric flavour compounds LXXX: alkyl-branched alkanals - stereodifferentiation, structure elucidation and structure - function relationship, Z. Lebensm.-Unters. Forsch., 206(3), 165-168 (1998)

Ionones, Irones, Damascones & Structurally Related Odorants

Acyclics (Alcohols, Esters, Acids, Aldehydes)

Lactones

Sesquiterpenoid Related Odorants