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Longifolene

[1S-(1α,3aβ,4α,8aβ)]-Decahydro-4,8,8-trimethyl-9-methylene-1,4-methanoazulene

Junipene · Kuromatsuene

Tricyclic sesquiterpenoid alkene · C₁₅H₂₄

Chemical structure of Longifolene
2D structure PubChem / NCI CIR

Chemical info

CAS number CAS
475-20-7
Molecular formula
C₁₅H₂₄
Molecular weight
204.35 g/mol
Aroma
Pine wood, lightly resinous, gently earthy. A subtle base note in conifer oils.

Safety

Low concern · Trace constituent

Longifolene is a sesquiterpene occurring at low levels in some pine and black seed oils.

Skin. Undiluted longifolene produced slight to moderate edema and erythema in rabbits under 24-hour occlusion. Tested at 10 percent on human volunteers, it was non-irritating and non-sensitizing.

Acute toxicity. Acute oral LD50 in rats exceeded 5 g/kg. Acute dermal LD50 in rabbits exceeded 5 g/kg. The compound is safe for humans at standard use levels.

Usage guidelines

Concern level
Low
Regulatory limit
No IFRA or EU limit set specifically

Found in essential oils

Principal sources
Black seed1.2 – 10.2 %
Cedarwood (Chinese)4.2 %
Pine (Scots)0 – 3.5 %
Grindelia1.0 – 2.5 %

Notes

Longifolene is a tricyclic sesquiterpene with a structure that is difficult to synthesize. It serves as a precursor for several synthetic fragrance compounds.