7-Nonenal, 6,8-dimethyl- (CAS 899810-84-5) — Green Top to middle Note Fragrance Ingredient
7-_Nonenal, 6,_8-_dimethyl-
CAS 899810-84-5
What Is 7-_Nonenal, 6,_8-_dimethyl-?
7-Nonenal, 6,8-dimethyl- is a synthetic fragrance ingredient used to add green, cucumber-like freshness to modern perfumes. You’ll encounter it in aquatic and floral fragrances where a crisp, watery effect is desired. This molecule matters because it mimics natural freshness without relying on plant extracts, offering perfumers precise control over green accords in sustainable formulations.
Safety Profile
GENERALLY SAFEWhat Does 7-_Nonenal, 6,_8-_dimethyl- Smell Like?
6,8-Dimethyl-7-nonenal bursts with the piercing greenness of crushed cucumber peel and freshly cut grass. The initial aldehydic sharpness (reminiscent of watermelon rind) settles into a watery heart note with subtle melon undertones. As it dries, a faint waxy character emerges – imagine the clean scent of a greenhouse after rain. Its tenacity is moderate (2-4 hours), making it ideal for modern aquatic bases where traditional calone might feel too marine.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to amplify the watery citrus opening, creating a dewy effect that bridges yuzu and nutmeg. The aldehyde’s green character prevents the marine notes from becoming overly salty.
Jean-Claude Ellena employed this molecule to replicate the crispness of Nile riverbank vegetation. It provides the illusion of sliced green mango without fruity sweetness.
Chemistry, Properties & Perfumer Guide
The Chemistry
As an α,β-unsaturated aldehyde, 6,8-dimethyl-7-nonenal belongs to the same chemical family as cucumber aldehyde (2,6-nonadienal). The dimethyl substitution at positions 6 and 8 increases stability compared to simpler nonenals. Industrial synthesis typically proceeds via aldol condensation of isobutyraldehyde with 2-methyl-2-pentenal, followed by careful purification to minimize polymerization. The trans configuration at the double bond is essential for the characteristic fresh odor.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Point | ~210 °C (estimated) |
| Density | ~0.85 g/cm³ (estimated) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Overdosing causes waxy off-notes |
| Functional Products | 0.01-0.1% | Up to 0.2% | Adds freshness to detergents |
Classic Accords
Tip: Stabilize in ethanol before adding to water-based systems to prevent hydrolysis.
Alternatives & Comparisons
The classic cucumber aldehyde – more intense but less stable. Use when maximum green impact is needed in short-lived compositions.
For sweeter, fruitier green effects where the watery character of 7-nonenal would be too subtle.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted under IFRA standards. Classified as a Category 4 material (low risk).
RIFM Assessment
RIFM evaluation ongoing. Preliminary data suggests no significant sensitization risk at typical use levels.
Sustainability
As a synthetic material, 6,8-dimethyl-7-nonenal avoids agricultural land use. The synthesis route has been optimized to minimize heavy metal catalysts. However, like all aldehydes, it requires energy-intensive purification steps. Some producers now offer bio-based versions using fermentation-derived intermediates.
Explore 7-_Nonenal, 6,_8-_dimethyl-
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References
- Burdock, G.A. (2010). Fenaroli’s Handbook of Flavor Ingredients. CRC Press. ISBN 9781420090869
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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