5,9-Undecadien-2-ol,6,10-dimethyl-,acetate (CAS 91482-37-0) — Green Top to middle Note Fragrance Ingredient
5,9-Undecadien-2-ol,6,10-dimethyl-,acetate
CAS 91482-37-0
What Is 5,9-Undecadien-2-ol,6,10-dimethyl-,acetate?
5,9-Undecadien-2-ol,6,10-dimethyl-,acetate is a synthetic fragrance ingredient used in perfumery to create fresh, green, and slightly woody accords. You might encounter it in modern floral and citrus fragrances. This molecule matters because it helps perfumers achieve crisp, natural-smelling effects without relying on plant extracts, making fragrances more consistent and sustainable.
Safety Profile
GENERALLY SAFEWhat Does 5,9-Undecadien-2-ol,6,10-dimethyl-,acetate Smell Like?
Opens with a sharp, green freshness reminiscent of crushed leaves and unripe citrus peel. As it evolves, reveals a subtle woody undertone with hints of damp earth. The dry-down carries a clean, slightly musky character that blends seamlessly with floral notes. Imagine walking through a sunlit forest after rain – that crisp, alive quality captured in a molecule.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to amplify the naturalistic green accord, contributing to the fragrance’s signature ‘just-mown lawn’ freshness without overpowering the violet leaf and iris.
Modern formulations employ this molecule to recreate the original’s hyper-realistic galbanum effect while improving stability and reducing skin sensitivity.
2D Molecular Structure
SMILES: CC(CCC=C(C)CCC=C(C)C)OC(C)=O
Chemistry, Properties & Perfumer Guide
The Chemistry
This acetate ester belongs to the family of unsaturated aliphatic alcohols. Synthesized through esterification of the corresponding dienol with acetic anhydride, it features two strategically placed double bonds that contribute to its fresh-green olfactory character. The molecule’s stereochemistry influences its odor profile, with certain isomers displaying more pronounced green characteristics.
Physical & Chemical Properties
| Boiling Point | Not available |
|---|---|
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Green note enhancer |
| Functional Fragrances | 0.1-0.5% | Up to 1% | Freshness booster |
Classic Accords
Tip: Use in trace amounts with citrus top notes to prevent harshness while maintaining freshness.
Alternatives & Comparisons
When a more diffusive, less earthy green note is needed. Offers better stability in alkaline formulations.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA standards.
RIFM Assessment
Under evaluation by RIFM as of 2023.
Sustainability
As a synthetic material, production avoids agricultural land use. Manufacturing typically occurs in facilities with closed-loop solvent recovery systems to minimize environmental impact. The molecule’s efficiency means less material is needed to achieve desired effects 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 errorIngredient Data Sheet
CAS 91482-37-0Physical Properties
| Molecular Weight | 238.37 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 4.7🔬 PubChem |
| Boiling Point | 273 °C🔬 EPA CompTox |
| Vapor Pressure | 0.0138 mmHg @ 25°C📊 OPERA |
| Flash Point | 85.5 °C🔬 EPA CompTox |
| Involatility Index | 0.001💻 Calculated |
| log Kp (skin permeability) | -0.817💻 Calculated |
| SMILES | CC(CCC=C(C)CCC=C(C)C)OC(=O)C🔬 PubChem |
Volatility & Performance
| Fragrance Note | Heart💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 4.5 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | greenwoody• leffingwell |
| Functional Groups | esteretheralkene💻 RDKit |
Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
Physicochemical Properties
DTXSID: DTXSID7052608
Physical Properties
| Molecular Weight | 238.371 g/mol🔬 EPA CompTox |
| Density | 0.884 g/cm^3📊 OPERA |
| Boiling Point | 277.434 °C📊 OPERA |
| Melting Point | -20.658 °C📊 OPERA |
| Flash Point | 94.313 °C📊 OPERA |
| Refractive Index | 1.46 Dimensionless📊 OPERA |
| Molar Volume | 266.827 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 5.093 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 5.093 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 5.093 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 7.55 Log10 unitless📊 OPERA |
| Water Solubility | 0 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.007 mmHg📊 OPERA |
| Viscosity | 3.859 cP📊 OPERA |
| Surface Tension | 27.54 dyn/cm📊 OPERA |
| Thermal Conductivity | 137.503 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 | 7 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 73.076 cm^3/mol📊 OPERA |
| Polarizability | 28.97 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.
