2,6-Nonadien-1-ol (CAS 7786-44-9) — Green Top to middle Note Fragrance Ingredient
2,6-Nonadien-1-ol
CAS 7786-44-9
What Is 2,6-Nonadien-1-ol?
2,6-Nonadien-1-ol is a synthetic fragrance ingredient that imparts a fresh, cucumber-like aroma. It’s often used in fine fragrances and personal care products to create crisp, watery green accords. This molecule matters because it can recreate natural freshness without relying on plant extracts, offering consistency and sustainability advantages.
Safety Profile
GENERALLY SAFEWhat Does 2,6-Nonadien-1-ol Smell Like?
2,6-Nonadien-1-ol bursts with the crisp freshness of just-cut cucumber peel, underscored by a dewy melon-like sweetness. The initial green sharpness evolves into a more rounded, watery heart reminiscent of sliced honeydew floating in mineral water. As it dries down, subtle earthy undertones emerge like the damp soil scent clinging to garden-fresh vegetables. The overall effect is an ultra-clean, almost metallic freshness that lasts surprisingly long for such a light molecule.
Chemistry, Properties & Perfumer Guide
The Chemistry
2,6-Nonadien-1-ol is an unsaturated aliphatic alcohol with two double bonds at positions 2 and 6. The (E)-isomer is primarily responsible for the characteristic cucumber odor. Industrially produced via controlled oxidation of corresponding aldehydes or through specialized Grignard reactions. The molecule’s reactivity requires careful handling during synthesis to prevent polymerization of the diene system.
Physical & Chemical Properties
| Boiling Point | Approx. 195-200 °C (estimated) |
|---|---|
| Density | ~0.85 g/cm³ (estimated) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Fresh top note component |
| Personal Care | 0.05-0.2% | Up to 0.5% | Cucumber-type freshness |
| Functional Products | 0.01-0.1% | Up to 0.3% | Masking agent |
Classic Accords
Tip: Use in trace amounts with citrus top notes to enhance natural freshness without overpowering.
Alternatives & Comparisons
More intense cucumber character with fatty undertones, better for high-impact applications.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA standards.
GHS Classification
RIFM Assessment
RIFM has evaluated this material as safe for current fragrance use levels.
Sustainability
As a synthetic material, 2,6-Nonadien-1-ol offers consistent quality without agricultural land use. Production typically involves petrochemical feedstocks, though bio-based routes are being explored. The molecule’s potency means very small quantities are needed, reducing overall environmental impact per kilogram of finished product.
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References
- Burdock, G.A. (2010). Fenaroli’s Handbook of Flavor Ingredients. CRC Press.
- Sell, C. (2006). The Chemistry of Fragrances. RSC Publishing.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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