2,7-Nonadien-4-ol, 4,8-dimethyl- (CAS 103983-77-3) — Green Top to middle Note Fragrance Ingredient
2,7-Nonadien-4-ol, 4,8-dimethyl-
CAS 103983-77-3
What Is 2,7-Nonadien-4-ol, 4,8-dimethyl-?
2,7-Nonadien-4-ol, 4,8-dimethyl- is a synthetic fragrance ingredient that you might encounter in modern perfumes, especially those with fresh, green, or aquatic characteristics. It’s often used to enhance natural freshness in body care products and fine fragrances. This molecule matters because it can replicate the crisp, outdoorsy scents that are difficult to capture from natural sources, allowing perfumers to create consistent, long-lasting green accords without relying on seasonal plant materials.
Safety Profile
USE WITH AWARENESSWhat Does 2,7-Nonadien-4-ol, 4,8-dimethyl- Smell Like?
A vibrant green molecule with surprising depth – imagine snapping a fresh alder twig combined with the dew-covered cucumber skin. Opens with a sharp, almost metallic greenness that quickly softens into crushed violet leaves and young bamboo shoots. The dry-down reveals a subtle marine nuance, like ocean mist carrying the scent of distant kelp forests. Unlike simpler green notes, this maintains dimensionality for hours, never collapsing into flat vegetal tones. There’s a hidden fruity facet reminiscent of underripe honeydew melon that emerges when blended with citrus.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Modern reformulations use this synthetic to recreate the legendary galbanum burst of the original, providing an airy green lift that lasts longer than natural materials.
Provides the shimmering green mango skin effect in the top notes, blending with citrus to create a dewy, sun-warmed fruit illusion.
2D Molecular Structure
SMILES: CC=CC(C)(O)CCC=C(C)C
Chemistry, Properties & Perfumer Guide
The Chemistry
This branched unsaturated alcohol belongs to the C9-alcohol family, structurally resembling natural leaf alcohols but with enhanced stability. The conjugated diene system contributes to its tenacious green character, while the methyl branches prevent it from becoming overly harsh. Industrially synthesized via hydroformylation of appropriate diene precursors, its stereochemistry significantly impacts odor quality – the (4S,8S) isomer exhibits the most natural green profile. Unlike simpler leaf alcohols, the extended carbon skeleton allows for slower evaporation and better blending with floral middle notes.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Point | Approx. 210-220 °C (estimated) |
| Density | ~0.89 g/cm³ (estimated) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Green accent note |
| Functional Fragrances | 0.1-0.5% | Up to 1% | Freshness booster |
Classic Accords
Tip: Use at 0.2-0.5% in citrus top notes to create the illusion of freshly crushed stems.
Alternatives & Comparisons
For simpler, shorter-lasting green notes when cost is a concern – lacks the marine dry-down of 2,7-nonadienol.
When more floral green character is needed – shares similar tenacity but with magnolia leaf facets.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted under any IFRA amendment. Self-regulatory use limits recommended due to limited chronic exposure data.
RIFM Assessment
Under evaluation by RIFM as of 2023 – preliminary data suggests low acute toxicity but requires more extensive testing.
Sustainability
As a purely synthetic material, this avoids agricultural land use and seasonal variability issues. Production typically uses petrochemical feedstocks, though some manufacturers are exploring bio-based routes via fermentation-derived intermediates. The material’s potency means small quantities achieve significant effects, reducing overall carbon footprint per kilogram of fragrance.
Explore 2,7-Nonadien-4-ol, 4,8-dimethyl-
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References
- Arctander, S. (1969). Perfume and Flavor Chemicals. Montclair, NJ.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 103983-77-3Physical Properties
| Molecular Weight | 168.28 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 3🔬 PubChem |
| Boiling Point | 215 °C🔬 EPA CompTox |
| Vapor Pressure | 0.0631 mmHg @ 25°C📊 OPERA |
| Flash Point | 92.7 °C🔬 EPA CompTox |
| Involatility Index | 0.0052💻 Calculated |
| log Kp (skin permeability) | -1.597💻 Calculated |
| SMILES | CC=CC(C)(CCC=C(C)C)O🔬 PubChem |
Volatility & Performance
| Fragrance Note | Heart💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 2.1 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | floralgreen• leffingwell |
| Functional Groups | alcoholalkene💻 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: DTXSID801022661
Physical Properties
| Molecular Weight | 168.28 g/mol🔬 EPA CompTox |
| Density | 0.862 g/cm^3📊 OPERA |
| Boiling Point | 226.899 °C📊 OPERA |
| Melting Point | -13.877 °C📊 OPERA |
| Flash Point | 87.525 °C📊 OPERA |
| Refractive Index | 1.472 Dimensionless📊 OPERA |
| Molar Volume | 194.695 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.489 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 3.489 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.489 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 7.53 Log10 unitless📊 OPERA |
| Water Solubility | 0.003 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.027 mmHg📊 OPERA |
| Viscosity | 4.537 cP📊 OPERA |
| Surface Tension | 26.791 dyn/cm📊 OPERA |
| Thermal Conductivity | 137.4 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 | 54.469 cm^3/mol📊 OPERA |
| Polarizability | 21.593 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.
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