Ethyl 2,4,7-decatrienoate (CAS 78417-28-4) — Sweet Top to middle Note Fragrance Ingredient
Ethyl 2,4,7-decatrienoate
CAS 78417-28-4
What Is Ethyl 2,4,7-decatrienoate?
Ethyl 2,4,7-decatrienoate is a synthetic fragrance ingredient used in perfumery to create fruity, tropical nuances. You’ll encounter it in modern fruity-floral and tropical fragrances. This molecule matters because it adds a juicy, exotic character that’s difficult to achieve with natural materials alone, allowing perfumers to craft vibrant, contemporary scent profiles.
Safety Profile
USE WITH AWARENESSWhat Does Ethyl 2,4,7-decatrienoate Smell Like?
Ethyl 2,4,7-decatrienoate bursts with a vibrant tropical fruit character – imagine ripe passionfruit dripping with juice crossed with the tangy sweetness of starfruit. The opening is intensely fruity with pear-like undertones, evolving into a heart that recalls exotic mango skins and overripe guava. As it dries down, it reveals a subtle green stemminess that prevents the fruitiness from becoming cloying. The overall effect is like walking through a tropical fruit market at peak ripeness season.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as the core tropical fruit accord, providing authentic passionfruit and guava nuances that form the fragrance’s signature juicy character.
Creates the mouthwatering top note that mimics freshly cut exotic fruits, blended with citrus for a refreshing opening.
2D Molecular Structure
SMILES: CCOC(=O)C=CC=CCC=CCC
Chemistry, Properties & Perfumer Guide
The Chemistry
Ethyl 2,4,7-decatrienoate belongs to the ester class of compounds, specifically a polyunsaturated fatty acid ester. While not found in nature, it mimics the scent profile of various tropical fruits. Synthesis typically involves esterification reactions between decatrienoic acid derivatives and ethanol. The conjugated triene system contributes to its vibrant olfactory character and relatively high reactivity compared to saturated esters.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Odor Threshold | Extremely low (parts per billion range) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Powerful fruity modifier |
| Functional Fragrance | 0.01-0.1% | Up to 0.2% | Tropical fruit effects |
Classic Accords
Tip: Use in trace amounts to enhance fruity top notes without overwhelming the composition.
Alternatives & Comparisons
For a less intense fruity effect with similar tropical character but better stability in formulations.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions. General ester guidelines apply.
RIFM Assessment
Under evaluation by RIFM. Preliminary data suggests safe use at current levels.
Sustainability
As a synthetic material, Ethyl 2,4,7-decatrienoate offers consistent quality without natural sourcing constraints. Its production has relatively low environmental impact compared to harvesting rare tropical fruits for their aromatic compounds. Being highly potent, it’s used in minute quantities, reducing overall material consumption.
Explore Ethyl 2,4,7-decatrienoate
Browse essential oils and aroma compounds.
Browse on iHerb →Affiliate disclosure: we may earn a small commission at no extra cost to you.
References
- Burdock, G.A. (2010). Fenaroli’s Handbook of Flavor Ingredients. CRC Press. ISBN 9781420090860
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID30868478
Physical Properties
| Molecular Weight | 194.274 g/mol🔬 EPA CompTox |
| Density | 0.931 g/cm^3📊 OPERA |
| Boiling Point | 260.594 °C📊 OPERA |
| Melting Point | -6.522 °C📊 OPERA |
| Flash Point | 151.216 °C📊 OPERA |
| Refractive Index | 1.477 Dimensionless📊 OPERA |
| Molar Volume | 210.943 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.678 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 3.678 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.678 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 5.77 Log10 unitless📊 OPERA |
| Water Solubility | 0.001 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.031 mmHg📊 OPERA |
| Surface Tension | 28.472 dyn/cm📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 26.3 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 2 count💻 Computed |
| Rotatable Bonds | 6 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 59.591 cm^3/mol📊 OPERA |
| Polarizability | 23.624 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.
