2,6-Nonadienal diethyl acetal (CAS 67674-36-6) — Green Top Note Fragrance Ingredient
2,6-Nonadienal diethyl acetal
CAS 67674-36-6
What Is 2,6-Nonadienal diethyl acetal?
2,6-Nonadienal diethyl acetal is a synthetic fragrance ingredient used to impart fresh, green, cucumber-like notes in perfumes and scented products. It’s commonly found in fine fragrances, body care products, and air fresheners. This ingredient matters because it provides a crisp, watery freshness that mimics natural cucumber and melon aromas, enhancing modern aquatic and green fragrance compositions.
Safety Profile
GENERALLY SAFEWhat Does 2,6-Nonadienal diethyl acetal Smell Like?
2,6-Nonadienal diethyl acetal bursts with an intense, watery-green freshness reminiscent of freshly cut cucumbers and honeydew melon rind. The top note is sharply vegetal with a dewy, almost metallic edge that evolves into a softer, rounded heart of green tea leaves and young bamboo shoots. Dry-down reveals a whisper of clean linen and aquatic nuances, leaving a transparent trail that’s refreshing without being overpowering.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used to amplify the tomato leaf accord, creating a hyper-realistic garden effect that’s both earthy and refreshing.
Provides the wet, dewy melon facet that mimics the freshness after tropical rainfall.
2D Molecular Structure
SMILES: CCOC(OCC)\C=C\CC\C=C/CC
Chemistry, Properties & Perfumer Guide
The Chemistry
2,6-Nonadienal diethyl acetal belongs to the acetal class of fragrance compounds, formed by the reaction of 2,6-nonadienal with ethanol. This protection of the aldehyde group enhances stability while maintaining the characteristic green odor. The molecule features a nine-carbon chain with two double bonds (2,6 positions) that are crucial for its fresh green character. Industrial synthesis typically involves acetalization of trans-2,cis-6-nonadienal under acidic conditions.
Physical & Chemical Properties
| Boiling Point | Not publicly available |
|---|---|
| Density | Not publicly available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Provides fresh top notes |
| Functional Fragrances | 0.01-0.1% | Up to 0.3% | For soap and detergent applications |
Classic Accords
Tip: Use sparingly in citrus colognes to add a dewy, rain-kissed dimension.
Alternatives & Comparisons
When a sweeter, more candied melon effect is desired without the cucumber freshness.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA. No specific usage limits established.
RIFM Assessment
RIFM has evaluated related nonadienal compounds but no specific assessment found for this acetal derivative.
Sustainability
As a synthetic material, 2,6-Nonadienal diethyl acetal doesn’t rely on agricultural production. However, its synthesis requires petrochemical feedstocks. The acetal group improves stability, potentially reducing waste from degradation compared to the parent aldehyde. Future green chemistry approaches may optimize the synthesis route.
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References
- Bauer, K. et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH.
- Arctander, S. (1969). Perfume and Flavor Chemicals. Allured.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID0047034
Physical Properties
| Molecular Weight | 212.333 g/mol🔬 EPA CompTox |
| Density | 0.868 g/cm^3📊 OPERA |
| Boiling Point | 263.637 °C📊 OPERA |
| Melting Point | -48.282 °C📊 OPERA |
| Flash Point | 87.714 °C📊 OPERA |
| Refractive Index | 1.453 Dimensionless📊 OPERA |
| Molar Volume | 243.454 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 4.201 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 4.201 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 4.201 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 6.56 Log10 unitless📊 OPERA |
| Water Solubility | 0.001 mol/L📊 OPERA |
| Henry's Law Constant | 0.001 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.042 mmHg📊 OPERA |
| Viscosity | 1.985 cP📊 OPERA |
| Surface Tension | 26.339 dyn/cm📊 OPERA |
| Thermal Conductivity | 137.764 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 18.46 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 2 count💻 Computed |
| Rotatable Bonds | 9 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 65.841 cm^3/mol📊 OPERA |
| Polarizability | 26.101 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.
