Immediately piney, sharp, and turpenic. Clean and bright — the archetypal conifer smell. More resinous than limonene, less medicinal than eucalyptol, sharper than beta-pinene (its isomer, which is woodier). At dilution, a subtle herbal-green quality emerges. Very volatile — the first thing you smell in a pine forest, and the first thing to disappear from a blotter.
Evolution over time
Immediately
Immediately
Sharp, bright pine burst. Turpenic and clean. Very volatile.
After a few hours
After a few hours
Pine character fades rapidly. Faint herbal-resinous residue.
CAS 80-56-8. A bicyclic monoterpene and an abundant terpenes in nature. Alpha-pinene is the dominant volatile in pine resin, and is found at significant levels in rosemary, eucalyptus, frankincense, and dozens of other essential oils. It is the single most produced terpene by plants globally.
The scent is sharply piney, fresh, and turpenic. It reads as clean, bright, and coniferous — the immediate, unmistakable smell of a pine forest. At high concentrations, a solvent-like harshness appears; at typical perfumery levels, it is crisp and invigorating. The molecule is a top note with high volatility (boiling point 156°C) and rapid evaporation.
In perfumery, alpha-pinene is more often a component of essential oils (pine, rosemary, cypress, juniper) than used as an isolated molecule. Its primary value is as a contributor to the 'fresh-green-coniferous' character of these oils. When used as an isolate, it provides sharp piney freshness but must be blended carefully to avoid a turpentine-like impression.
Alpha-pinene is the most widely emitted biogenic volatile organic compound (BVOC) on Earth — global forests release an estimated 66 million tonnes annually. This massive emission contributes to the blue haze visible over forested mountains (hence 'Blue Ridge Mountains') through atmospheric photochemistry.
Extraction & Chemistry
Extraction method: Commercially obtained from turpentine — a byproduct of the paper pulp industry (gum turpentine from pine resin, or sulfate turpentine from the Kraft process). Turpentine is approximately 60-80% alpha-pinene. Annual global production of turpentine exceeds 300,000 tonnes, making alpha-pinene one of the cheapest and most abundant natural aroma chemicals.
Molecular Formula
C10H16
CAS Number
80-56-8
Botanical Name
Found in Pinus spp., Salvia rosmarinus, Boswellia spp.
IFRA Status
< 10 mmoles / liter peroxides
Synonyms
ALPHA-PINENE · Α-PINENE
Physical Properties
Odor Strength
High
Lasting Power
4 hours at 100%
Appearance
Colorless to pale yellow clear liquid
Boiling Point
155.00 to 156.00 °C. @ 760.00 mm Hg
Flash Point
90.00 °F. TCC ( 32.22 °C. )
Specific Gravity
0.85300 to 0.86100 @ 25.00 °C.
Refractive Index
1.46300 to 1.46700 @ 20.00 °C.
Melting Point
-64.00 to -62.00 °C. @ 760.00 mm Hg
In Perfumery
Top-note contributor in pine, coniferous, and aromatic-green compositions. Alpha-pinene provides the bright, opening freshness of pine-based accords. It is usually present as a natural component of essential oils rather than added as an isolate. In aromatic fougères, it contributes pine freshness alongside lavender and rosemary. The molecule is also a starting material for the synthesis of many other terpene-derived aroma chemicals (including linalool and terpineol).
