Nonanal, 5-ethyl-2-methyl- (CAS 68141-14-0) — Green Top to middle Note Fragrance Ingredient
Nonanal, 5-ethyl-2-methyl-
CAS 68141-14-0
What Is Nonanal, 5-ethyl-2-methyl-?
Nonanal, 5-ethyl-2-methyl- is a synthetic fragrance ingredient used to add green, citrusy, and slightly floral nuances to perfumes. It’s commonly found in modern floral and fresh fragrances. This molecule matters because it provides a crisp, aldehydic lift that helps brighten compositions while adding subtle complexity.
Safety Profile
GENERALLY SAFEWhat Does Nonanal, 5-ethyl-2-methyl- Smell Like?
Nonanal, 5-ethyl-2-methyl- opens with a sharp, green-aldehydic burst reminiscent of crushed leaves and citrus zest. As it evolves, it reveals a softer floralcy akin to magnolia petals floating in water. The dry-down presents a clean, slightly waxy character with hints of cucumber freshness. Its medium volatility makes it useful for bridging top and heart notes, adding a sophisticated crispness without overwhelming compositions.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to enhance the crisp green facets of magnolia, providing structural contrast to the creamy florals.
Contributes to the watery-green mango accord, adding aldehyde freshness to the tropical fruit notes.
Chemistry, Properties & Perfumer Guide
The Chemistry
This branched-chain aldehyde belongs to the nonanal family, where the ethyl and methyl substitutions create unique steric effects. Synthesized through hydroformylation of corresponding olefins, its structure prevents easy oxidation compared to straight-chain aldehydes. The branching reduces volatility while maintaining good diffusion properties.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Odor Threshold | 0.01 ppm in air |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Fresh floral modifier |
| Functional Fragrance | 0.1-0.5% | Up to 1% | Clean freshness booster |
Classic Accords
Tip: Stabilize in ethanol before adding to water-based systems to prevent aldehyde polymerization.
Alternatives & Comparisons
For similar effects at higher concentrations with more floral richness.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions currently apply.
RIFM Assessment
Not currently evaluated by RIFM but structurally similar to approved materials.
Sustainability
As a synthetic material, production can be optimized for minimal waste. No known ecological concerns at current usage levels. More sustainable than some natural aldehydes requiring palm-derived precursors.
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References
- Bauer et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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