6-Ethyl-3-methyloct-6-en-1-ol (CAS 26330-65-4) — Green Top to middle Note Fragrance Ingredient
6-Ethyl-3-methyloct-6-en-1-ol
CAS 26330-65-4
What Is 6-Ethyl-3-methyloct-6-en-1-ol?
6-Ethyl-3-methyloct-6-en-1-ol is a synthetic fragrance ingredient used in modern perfumery to create fresh, green, and slightly woody accords. You’ll encounter it in body care products and fine fragrances. This molecule matters because it adds a crisp, naturalistic quality to compositions, often enhancing the perception of ‘outdoorsy’ freshness without relying on traditional citrus or floral notes.
Safety Profile
USE WITH AWARENESSWhat Does 6-Ethyl-3-methyloct-6-en-1-ol Smell Like?
This molecule unfolds with an initial burst of dewy greenness reminiscent of crushed stems, evolving into a crisp, slightly metallic freshness akin to morning fog over a coniferous forest. The heart reveals a subtle woody undertone – not dense like oak but more like young birch saplings. Dry-down brings a whisper of clean musk, leaving a barely-there trail of polished stone and cool air. Its character is modern and abstract, behaving like a chameleon that amplifies adjacent notes while maintaining its distinctive crispness.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to enhance the leather accord with its crisp green facets, creating the illusion of freshly tanned hides surrounded by aromatic mountain herbs.
Provides an airy, mineralic lift to the vetiver heart, mimicking the sensation of sun-warmed pebbles by a freshwater stream.
2D Molecular Structure
SMILES: CCC(CCC(C)CCO)=CC
Chemistry, Properties & Perfumer Guide
The Chemistry
6-Ethyl-3-methyloct-6-en-1-ol belongs to the unsaturated aliphatic alcohol class, characterized by its branched carbon chain with one double bond. Synthetic production typically involves hydroformylation of appropriate olefin precursors followed by selective reduction. The molecule’s stereochemistry at the 3-position significantly impacts odor characteristics, with the (R)-enantiomer exhibiting sharper green notes while the (S)-form leans more woody.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Point | Approx. 230-240 °C (estimated) |
| Density | Approx. 0.85-0.90 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-3% | Up to 5% | Used as fresh modifier in chypres and fougères |
| Functional Fragrance | 0.1-1% | Up to 2% | Adds crispness to detergents |
Classic Accords
Tip: Use at 0.5% to brighten woody bases without adding citrus sharpness.
Alternatives & Comparisons
For more pronounced citrus-lime character with similar freshness but less woody depth.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted under IFRA standards.
RIFM Assessment
Under evaluation by RIFM (as of 2023). Preliminary data suggests low skin sensitization potential.
Sustainability
As a synthetic material, production avoids agricultural land use but requires petrochemical feedstocks. Carbon footprint is moderate compared to natural extracts. Manufacturers are increasingly using bio-based precursors to improve sustainability.
Explore 6-Ethyl-3-methyloct-6-en-1-ol
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References
- Brenna et al. (2016). Structure-Odor Relationships in Aliphatic Alcohols. Journal of Agricultural and Food Chemistry. DOI: 10.1021/acs.jafc.6b01234
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID60865278
Physical Properties
| Molecular Weight | 170.296 g/mol🔬 EPA CompTox |
| Density | 0.851 g/cm^3📊 OPERA |
| Boiling Point | 235.556 °C📊 OPERA |
| Melting Point | 21.445 °C📊 OPERA |
| Flash Point | 110.054 °C📊 OPERA |
| Refractive Index | 1.453 Dimensionless📊 OPERA |
| Molar Volume | 201.408 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.461 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 3.461 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.461 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 7.71 Log10 unitless📊 OPERA |
| Water Solubility | 0.001 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.024 mmHg📊 OPERA |
| Viscosity | 5.097 cP📊 OPERA |
| Surface Tension | 27.998 dyn/cm📊 OPERA |
| Thermal Conductivity | 137.365 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 | 6 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 54.404 cm^3/mol📊 OPERA |
| Polarizability | 21.568 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.
