6,10-Dimethyl-5,9-undecadien-2-one (CAS 3796-70-1) — Woody Top to Middle Note Fragrance Ingredient
6,10-Dimethyl-5,9-undecadien-2-one
CAS 3796-70-1
What Is 6,10-Dimethyl-5,9-undecadien-2-one?
6,10-Dimethyl-5,9-undecadien-2-one is a synthetic fragrance compound used to add fruity, floral, and woody nuances to perfumes. You’ll encounter it in many modern fragrances, particularly those aiming for a fresh yet sophisticated character. This ingredient matters because it provides perfumers with a versatile building block that can enhance both top and heart notes, contributing to a fragrance’s complexity and longevity without overpowering other elements.
Safety Profile
GENERALLY SAFEWhat Does 6,10-Dimethyl-5,9-undecadien-2-one Smell Like?
This molecule unfolds with an initial burst of fresh citrus-woody character, reminiscent of peeled mandarin skins over cedar shavings. As it develops, a subtle floralcy emerges – like the ghost of magnolia blossoms carried on a warm breeze. The dry-down reveals an elegant, slightly musky woodiness that lingers close to the skin, creating an intimate trail. Throughout its evolution, there’s an intriguing metallic sheen that keeps the composition modern and crisp.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to enhance the citrus-herbaceous opening while providing a woody bridge to the mossy base notes.
Contributes to the fresh, androgynous character by blending citrus top notes with a subtle woody drydown.
Helps create the sparkling citrus-wood contrast that defines this summer fragrance.
Used as part of the watery-woody accord that makes this fragrance so distinctive.
Provides subtle woody depth to the marine accord, preventing it from becoming too sharp.
2D Molecular Structure
SMILES: CC(C)=CCC\C(C)=C\CCC(C)=O
Chemistry, Properties & Perfumer Guide
The Chemistry
6,10-Dimethyl-5,9-undecadien-2-one belongs to the class of unsaturated ketones, specifically a dienone. While not found in nature, its structure mimics certain terpenoid compounds. Industrially synthesized through aldol condensation reactions, this molecule features conjugated double bonds that contribute to its stability and odor characteristics. The specific arrangement of methyl groups creates steric hindrance that influences its volatility and interaction with olfactory receptors.
Physical & Chemical Properties
| Boiling Point | Not available |
|---|---|
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 8% | Adds freshness to citrus compositions |
| Functional Fragrance | 0.5-2% | Up to 3% | Used in soaps and detergents |
| Cosmetics | 0.1-1% | Up to 2% | Background modifier in lotions |
Classic Accords
Tip: Use in citrus compositions to prevent excessive volatility and add drydown interest.
Alternatives & Comparisons
Similar floral-woody profile but with more pronounced rosy character and less citrus.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No current IFRA restrictions.
RIFM Assessment
Currently under evaluation by RIFM.
Sustainability
As a synthetic material, this compound is produced through controlled chemical processes with minimal environmental impact compared to natural alternatives. Its efficient synthesis means lower resource consumption per kilogram of finished product. Being petroleum-derived, it avoids issues associated with agricultural sourcing but contributes to dependence on fossil feedstocks.
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References
- Burdock, G.A. (2010). Fenaroli’s Handbook of Flavor Ingredients. CRC Press.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 3796-70-1Physical Properties
| Molecular Weight | 194.31 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 3.7🔬 PubChem |
| Boiling Point | 248 °C🔬 EPA CompTox |
| Vapor Pressure | 0.0537 mmHg @ 25°C📊 OPERA |
| Flash Point | 107.2 °C🔬 EPA CompTox |
| Involatility Index | 0.0042💻 Calculated |
| log Kp (skin permeability) | -1.258💻 Calculated |
Volatility & Performance
| Fragrance Note | Heart💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 2.6 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | floralfreshfruitygreenrose• leffingwell |
| “: Fresh-floral, light, but rather penetrating, 1) from Geraniol via Geranyl chloride and sweet-rosy, slightly green, Magnolia-like odor Ethyl geranyl acetoacetate followed by of moderate tenacity. The odor has some hydrolysis and decarboxylation to Geranyl resemblance to that of Rhodinyl formate, yet acetone.”📖 Arctander | |
Sensory Thresholds
| Odor Detection Threshold | 12.0587 ppm (n=4)📖 van Gemert |
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: DTXSID4052053
Physical Properties
| Molecular Weight | 194.318 g/mol🔬 EPA CompTox |
| Density | 0.856 g/cm^3📊 OPERA |
| Boiling Point | 251.653 °C📊 OPERA |
| Melting Point | 11.914 °C📊 OPERA |
| Flash Point | 99.913 °C📊 OPERA |
| Refractive Index | 1.459 Dimensionless📊 OPERA |
| Molar Volume | 227.075 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 4.098 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 4.098 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 4.098 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 6.66 Log10 unitless📊 OPERA |
| Water Solubility | 0 mol/L🔬 EPA CTX |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.029 mmHg📊 OPERA |
| Viscosity | 2.072 cP📊 OPERA |
| Surface Tension | 27.232 dyn/cm📊 OPERA |
| Thermal Conductivity | 135.085 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 17.07 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 1 count💻 Computed |
| Rotatable Bonds | 6 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 62.107 cm^3/mol📊 OPERA |
| Polarizability | 24.621 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.
