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α-Bulnesene

(3S,3aS,5R)-3,8-Dimethyl-5-(prop-1-en-2-yl)-1,2,3,3a,4,5,6,7-octahydroazulene

alpha-Bulnesene, δ-Guaiene

Sesquiterpene hydrocarbon (guaiane) · C₁₅H₂₄

Chemical structure of α-Bulnesene
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
3691-11-0
Molecular formula
C₁₅H₂₄
Molecular weight
204.36 g/mol
Origin
Natural
Odor family
Woody
Note
Base
Aroma
Dry wood, slightly spicy, with a patchouli-like facet.

History

α-Bulnesene, also called δ-guaiene, is a sesquiterpene present in significant amounts in patchouli and guaiacwood oils. It shares the guaiane skeleton with guaiol and rotundone.

In perfumery

α-Bulnesene is mainly a patchouli oil constituent and is used analytically to assess oil quality.

Connections

Evokespatchouli
Found in naturePatchouli (Pogostemon cablin), Guaiacwood

Regulatory status

Natural constituent · No IFRA standard
IFRA 51
No dedicated IFRA Standard in the 51st Amendment index.
EU allergen 2023/1545
The molecule is not named individually; patchouli oil is on the added allergen list.

Sources

  1. Wikidata Q27132629 (CAS 3691-11-0, formula; data mirrored from PubChem)
  2. Sell C.S. (ed.) The Chemistry of Fragrances: From Perfumer to Consumer, 2nd ed., Royal Society of Chemistry 2006
  3. The Good Scents Company Information System, material entries