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

The 2-Methylbutanals

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Photo by permission of M. Roudintska - Art & Parfum

(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)

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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