Dihydro-alpha-terpineol (CAS 498-81-7) — Floral Middle Note Fragrance Ingredient
Dihydro-alpha-terpineol
CAS 498-81-7
What Is Dihydro-alpha-terpineol?
Dihydro-alpha-terpineol is a synthetic fragrance ingredient used in perfumes and household products to add fresh, floral-citrus notes. It’s commonly found in air fresheners, detergents, and personal care items where a clean, uplifting scent is desired. This versatile molecule helps create balanced floral bouquets while adding subtle woody undertones. Its stability makes it valuable for products requiring long-lasting freshness.
Safety Profile
GENERALLY SAFEWhat Does Dihydro-alpha-terpineol Smell Like?
Dihydro-alpha-terpineol opens with crisp citrus-lime facets that quickly soften into a floral heart reminiscent of lily-of-the-valley with a dewy freshness. As it evolves, subtle pine-like woody notes emerge, creating an intriguing contrast with the initial brightness. The dry-down reveals a clean, slightly powdery muskiness that lingers close to the skin. Its odor profile bridges floral freshness with woody depth, making it particularly useful for modern fougère and citrus-floral compositions where balanced tenacity is required.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as a floral-woody bridge between the citrus top notes and herbal heart, contributing to the fragrance’s signature aquatic freshness.
Enhances the floralcy of lotus while adding subtle woody depth to this aquatic floral masterpiece.
2D Molecular Structure
SMILES: CC1CCC(CC1)C(C)(C)O
Chemistry, Properties & Perfumer Guide
The Chemistry
Dihydro-alpha-terpineol is a monoterpenoid alcohol synthesized through hydrogenation of alpha-terpineol. Its saturated structure provides greater oxidative stability compared to its unsaturated counterpart. The molecule exists as a racemic mixture unless specifically resolved, with the different enantiomers exhibiting slight variations in odor intensity. Industrial synthesis typically involves catalytic hydrogenation of pinene-derived intermediates.
Physical & Chemical Properties
| Boiling Point | Not available |
|---|---|
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 10% | Floral-woody modifier |
| Functional Fragrances | 0.5-3% | Up to 5% | Freshness booster |
Classic Accords
Tip: Use with ionones to enhance floralcy without overpowering delicate top notes.
Alternatives & Comparisons
More pronounced pine character with higher volatility, suitable when brighter top notes are desired.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions under Amendment 49
RIFM Assessment
Considered safe for current fragrance use levels based on RIFM assessments.
Sustainability
As a synthetic material, dihydro-alpha-terpineol offers consistent quality without natural sourcing constraints. Production typically utilizes renewable turpentine feedstocks. Its stability reduces the need for antioxidant additives in formulations.
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References
- Bauer et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID4041812
Physical Properties
| Molecular Weight | 156.269 g/mol🔬 EPA CompTox |
| Density | 0.904 g/cm^3📊 OPERA |
| Boiling Point | 214.529 °C📊 OPERA |
| Melting Point | 59.652 °C📊 OPERA |
| Flash Point | 88.327 °C📊 OPERA |
| Refractive Index | 1.459 Dimensionless📊 OPERA |
| Molar Volume | 173.691 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.085 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 3.085 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.085 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 6.71 Log10 unitless📊 OPERA |
| Water Solubility | 0.007 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.034 mmHg📊 OPERA |
| Viscosity | 8.609 cP📊 OPERA |
| Surface Tension | 30.071 dyn/cm📊 OPERA |
| Thermal Conductivity | 127.923 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 20.23 Ų💻 Computed |
| H-Bond Donors | 1 count💻 Computed |
| H-Bond Acceptors | 1 count💻 Computed |
| Rotatable Bonds | 1 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 47.476 cm^3/mol📊 OPERA |
| Polarizability | 18.821 Å^3📊 OPERA |
Data Sources:
🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.
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