2,6-Octadienal, 3,7-dimethyl-, reaction products with Et alc. (CAS 147060-73-9) — Citrus Top to middle Note Fragrance Ingredient
2,6-Octadienal, 3,7-dimethyl-, reaction products with Et alc.
CAS 147060-73-9
What Is 2,6-Octadienal, 3,7-dimethyl-, reaction products with Et alc.?
This synthetic fragrance ingredient is derived from citral (a citrusy aldehyde) and ethanol. It appears in citrus-forward perfumes, household cleaners, and some food flavorings. The reaction creates new molecules that retain citral’s bright character while improving stability. This ingredient matters because it delivers fresh, sparkling citrus notes without the rapid evaporation or skin sensitivity issues of pure citral.
Safety Profile
USE WITH AWARENESSWhat Does 2,6-Octadienal, 3,7-dimethyl-, reaction products with Et alc. Smell Like?
A vibrant citrus bouquet with the piercing freshness of lemon peel and the rounded sweetness of mandarin. Opens with a slightly green, waxy nuance that quickly gives way to a candied lemon drop effect. As it dries, the sharp edges soften into a warm, slightly floral citrus tea character. Unlike pure citral, this maintains its brightness for hours rather than minutes, with a clean woody-herbal drydown reminiscent of lemongrass.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to create an ultra-persistent lemon verbena effect that lasts through the drydown, avoiding the fleeting nature of natural citrus oils.
Provides the sun-drenched Mediterranean lemon note that forms the fragrance’s signature, blending seamlessly with apple and cedar.
Chemistry, Properties & Perfumer Guide
The Chemistry
This is a complex mixture resulting from the reaction of citral (3,7-dimethyl-2,6-octadienal) with ethanol under acidic conditions. The reaction produces citral diethyl acetal and various hemiacetals, which are more stable than citral itself. These derivatives retain the conjugated double bond system that gives citral its characteristic citrus odor, while the acetal formation reduces aldehyde-related skin sensitization potential.
Physical & Chemical Properties
| Appearance | Pale yellow liquid |
|---|---|
| Solubility | Soluble in alcohol and oils |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | 0.5-8% | Citrus accords and fresh top notes |
| Household Cleaners | 0.1-0.5% | Up to 1% | Provides lasting lemon freshness |
Classic Accords
Tip: Use with ionones to create photostable citrus-floral effects that won’t yellow in soap.
Alternatives & Comparisons
More stable alternative with similar odor profile but less ethanol content in final product.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific restrictions under current IFRA standards (Amendment 49).
EU Allergen Declaration
May require declaration if citral content exceeds 0.001% in leave-on products.
RIFM Assessment
Considered safe for current use levels based on citral safety assessment.
Sustainability
Synthetic production avoids citrus crop variations and provides consistent quality. The ethanol reaction byproducts are typically recovered and recycled in industrial processes.
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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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