Terpineol, dihydro- (CAS 58985-02-07) — Woody Middle Note Fragrance Ingredient
Terpineol, dihydro-
CAS 58985-02-07
What Is Terpineol, dihydro-?
Dihydroterpineol is a synthetic fragrance ingredient used to add fresh, woody, and slightly floral nuances to perfumes and household products. You’ll encounter it in air fresheners, fabric softeners, and some citrusy colognes. This versatile material helps create long-lasting freshness without being overpowering, bridging between bright top notes and deeper base accords.
Safety Profile
GENERALLY SAFEWhat Does Terpineol, dihydro- Smell Like?
Dihydroterpineol opens with crisp pine needle freshness that evolves into a rounded woody character reminiscent of sandalwood shavings. As it dries down, subtle floral undertones emerge like distant lilacs, while maintaining a clean laundry-like transparency. The drydown reveals a faintly sweet, almost minty coolness that lingers close to the skin.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used to reinforce the citrus-herbaceous accord while adding woody depth that prevents the composition from becoming too sharp.
Provides the smooth woody backbone that balances the intense pine needle top notes in this classic fougère.
Chemistry, Properties & Perfumer Guide
The Chemistry
Dihydroterpineol is a hydrogenated derivative of terpineol, belonging to the monoterpenoid alcohol class. Industrial synthesis typically involves catalytic hydrogenation of α-terpineol. The saturated structure makes it more stable than its parent compound while maintaining similar olfactory properties. Its molecular rigidity contributes to excellent tenacity in fragrance applications.
Physical & Chemical Properties
| Boiling Point | 198-200 °C |
|---|---|
| Density | 0.93 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 10% | Woody-floral modifier |
| Functional Products | 0.5-3% | Up to 5% | Freshness enhancer |
Classic Accords
Tip: Use to smooth harsh citrus notes and add woody depth without heaviness.
Alternatives & Comparisons
The unsaturated parent compound with brighter, more pronounced pine character but poorer stability.
Esterified version with softer, fruitier aspects and increased substantivity.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No restrictions under current IFRA standards.
EU Allergen Declaration
Not listed in EU allergen regulation (EC) No 1223/2009.
GHS Classification
RIFM Assessment
RIFM assessment concluded safe use at current industry levels.
Sustainability
Synthesized from renewable turpentine feedstocks. The hydrogenation process is energy-intensive but produces minimal waste. Biodegradability studies show moderate environmental persistence.
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References
- Bickers et al. (2005). Safety assessment of dihydroterpineol. Food and Chemical Toxicology. PMID 15951096
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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