Dihydro-alpha-terpinyl acetate (CAS 80-25-1) — Woody Middle Note Fragrance Ingredient
Dihydro-alpha-terpinyl acetate
CAS 80-25-1
What Is Dihydro-alpha-terpinyl acetate?
Dihydro-alpha-terpinyl acetate is a synthetic fragrance ingredient used to add fresh, woody, and slightly floral nuances to perfumes. It’s commonly found in masculine colognes and aromatic fougère compositions. This versatile material helps create crisp, clean scent profiles that last through the dry-down phase of a fragrance.
Safety Profile
GENERALLY SAFEWhat Does Dihydro-alpha-terpinyl acetate Smell Like?
Dihydro-alpha-terpinyl acetate opens with a crisp, clean woody character reminiscent of freshly planed cedarwood, quickly revealing subtle floral undertones like lavender stems. As it evolves, the scent becomes smoother and more refined, settling into a dry, slightly herbal base with whispers of citrus peel. The dry-down maintains excellent tenacity, leaving a polished woody signature that blends seamlessly with other materials.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as a woody-floral bridge between the fresh top notes and musky base, contributing to the fragrance’s clean, aquatic character.
Provides crisp woody support to the aromatic fougère structure, enhancing the masculine freshness.
2D Molecular Structure
SMILES: C[C@H]1CC[C@H](CC1)C(C)(C)OC(C)=O
Chemistry, Properties & Perfumer Guide
The Chemistry
Dihydro-alpha-terpinyl acetate is a synthetic terpene derivative created through hydrogenation and acetylation of alpha-terpineol. This process yields a more stable molecule with reduced volatility compared to its parent compound. The material belongs to the ester class of fragrance ingredients, known for their balanced volatility and pleasant odor profiles. Industrial synthesis typically involves catalytic hydrogenation followed by esterification with acetic anhydride.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Point | Approx. 220-230°C |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 10% | Woody-floral modifier |
| Functional Fragrance | 0.5-2% | Up to 5% | Clean scent booster |
Classic Accords
Tip: Use as a bridge between citrus top notes and woody base materials for improved longevity.
Alternatives & Comparisons
More floral and less woody character, suitable when brighter top notes are desired.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted under current IFRA standards.
RIFM Assessment
Evaluated by RIFM with no significant safety concerns at typical usage levels.
Sustainability
As a synthetic material, dihydro-alpha-terpinyl acetate offers consistent quality without natural sourcing pressures. Production can utilize renewable feedstocks, and its stability reduces waste in formulations. The material’s efficiency allows lower usage rates compared to some natural alternatives.
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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: DTXSID0052677
Physical Properties
| Molecular Weight | 198.306 g/mol🔬 EPA CompTox |
| Density | 0.924 g/cm^3📊 OPERA |
| Boiling Point | 224.505 °C📊 OPERA |
| Melting Point | 0.072 °C📊 OPERA |
| Flash Point | 84.125 °C📊 OPERA |
| Refractive Index | 1.448 Dimensionless📊 OPERA |
| Molar Volume | 212.68 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 4.454 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 4.454 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 4.454 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 5.84 Log10 unitless📊 OPERA |
| Water Solubility | 0.001 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.082 mmHg📊 OPERA |
| Viscosity | 3.18 cP📊 OPERA |
| Surface Tension | 29.731 dyn/cm📊 OPERA |
| Thermal Conductivity | 122.025 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 26.3 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 2 count💻 Computed |
| Rotatable Bonds | 2 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 56.981 cm^3/mol📊 OPERA |
| Polarizability | 22.589 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.
