3,7-Dimethyl-2,6-octadien-1-ol (CAS 624-15-7) — Floral Top to middle Note Fragrance Ingredient
3,7-Dimethyl-2,6-octadien-1-ol
CAS 624-15-7
What Is 3,7-Dimethyl-2,6-octadien-1-ol?
3,7-Dimethyl-2,6-octadien-1-ol is a synthetic fragrance molecule that mimics aspects of natural floral scents. You’ll encounter it in perfumes, soaps, and household products where a fresh, floral-green character is desired. This ingredient matters because it provides perfumers with a stable, cost-effective alternative to natural extracts, allowing consistent scent profiles across batches while reducing reliance on botanical sources.
Safety Profile
GENERALLY SAFEWhat Does 3,7-Dimethyl-2,6-octadien-1-ol Smell Like?
This molecule delivers a crisp, green-floral character reminiscent of lily-of-the-valley with subtle citrus undertones. The initial impression is sharply green, like crushed stems, evolving into a cleaner floral heart with dew-covered petals. As it dries down, it reveals a soft woody-musky base that prevents the floralcy from becoming cloying. The overall effect is fresh and transparent, with excellent diffusion that makes it valuable in modern floral compositions.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as a synthetic lily-of-the-valley note to create the fragrance’s signature floralcy without relying on natural extracts, providing stability and consistency.
Contributes to the fresh green floral accord that defines this modern classic, blending seamlessly with rose and peony notes.
2D Molecular Structure
SMILES: CC(C)=CCCC(C)=CCO
Chemistry, Properties & Perfumer Guide
The Chemistry
3,7-Dimethyl-2,6-octadien-1-ol belongs to the terpenoid alcohol class. While it occurs naturally in some plants, commercial production typically involves synthetic routes starting from citral or myrcene. The molecule exists in several stereoisomeric forms, with the trans-isomer being most common in fragrance applications. Industrial synthesis often involves selective hydrogenation of citral derivatives followed by careful purification to achieve the desired olfactory profile.
Physical & Chemical Properties
| Boiling Point | Not available |
|---|---|
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 10% | Floral-green modifier |
| Functional Products | 0.1-1% | Up to 3% | Freshness booster |
Classic Accords
Tip: Use with citrus top notes to enhance freshness or with white florals to add green dimensionality.
Alternatives & Comparisons
Offers similar floralcy but with less green character and more sweetness, useful when a softer floral effect is desired.
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 review by RIFM with preliminary data suggesting low risk at typical usage levels.
Sustainability
As a synthetic material, this ingredient reduces pressure on natural resources while offering consistent quality. Production typically uses petroleum-derived precursors, though some manufacturers are exploring bio-based routes using renewable feedstocks. The molecule’s efficiency means relatively small quantities are needed 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 errorIngredient Data Sheet
CAS 624-15-7Physical Properties
| Molecular Weight | 154.25 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 2.9🔬 PubChem |
| Boiling Point | 230 °C🔬 EPA CompTox |
| Vapor Pressure | 0.03 mmHg @ 25°C📊 OPERA |
| Flash Point | 42.2 °C🔬 EPA CompTox |
| Involatility Index | 0.0026💻 Calculated |
| log Kp (skin permeability) | -1.582💻 Calculated |
| SMILES | CC(=CCCC(=CCO)C)C🔬 PubChem |
Volatility & Performance
| Fragrance Note | Heart💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 2.6 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | geraniumrose• leffingwell |
| Functional Groups | alcoholalkene💻 RDKit |
| “Mild and sweet, floral Rose-type odor. Warm and yet slightly dry undertones, but there are great variations according to the quality and origin of the Geraniol.”📖 Arctander | |
Flavor Notes (Arctander)
| “Its taste is somewhat disappointing, somewhat bitter unless used at very low concentration. Nerol is generally preferred for better sweetness. However, Geraniol finds its way into multitude of flavor types, such as Apple, Apricot, Strawberry, Raspberry, Plum, Peach, Honey, Cherry, Lemon, Cassia, Cin”📖 Arctander |
Regulatory Status
| FEMA Number | FEMA 2507⚖️ FEMA GRAS |
| GRAS Status | Generally Recognized as Safe⚖️ FEMA GRAS |
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: DTXSID7041380
Physical Properties
| Molecular Weight | 154.253 g/mol🔬 EPA CompTox |
| Density | 0.874 g/cm^3📊 OPERA |
| Boiling Point | 228.59 °C📊 OPERA |
| Melting Point | 8.903 °C📊 OPERA |
| Flash Point | 86.275 °C📊 OPERA |
| Refractive Index | 1.471 Dimensionless📊 OPERA |
| Molar Volume | 177.941 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.47 Log10 unitless🔬 EPA CTX |
| LogD (pH 5.5) | 3.491 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.491 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 7.65 Log10 unitless📊 OPERA |
| Water Solubility | 0.003 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.024 mmHg📊 OPERA |
| Viscosity | 3.178 cP📊 OPERA |
| Surface Tension | 27.866 dyn/cm📊 OPERA |
| Thermal Conductivity | 141.229 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 | 4 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 49.714 cm^3/mol📊 OPERA |
| Polarizability | 19.708 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.
