3-Methylbutanal diethyl acetal (CAS 3842-03-03) — Green Top Note Fragrance Ingredient
3-Methylbutanal diethyl acetal
CAS 3842-03-03
What Is 3-Methylbutanal diethyl acetal?
3-Methylbutanal diethyl acetal is a synthetic fragrance ingredient used to add fruity, green, and slightly woody notes to perfumes and scented products. It’s commonly found in fine fragrances, body care items, and household cleaners. This molecule matters because it provides a fresh, natural-like aroma without relying on natural extracts, making formulations more consistent and sustainable.
Safety Profile
GENERALLY SAFEWhat Does 3-Methylbutanal diethyl acetal Smell Like?
3-Methylbutanal diethyl acetal opens with a burst of green apple peel and unripe banana, evolving into a heart of fresh-cut grass with a subtle almond undertone. The dry-down reveals a whisper of clean linen and wet stones, making it surprisingly versatile for both fresh and warm compositions. Its behavior is linear yet complex, like sunlight filtering through a leafy canopy.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to amplify the naturalistic green accord, enhancing the illusion of dew-covered clover leaves without overpowering the violet leaf.
Provides a crisp, modern edge to the classic citrus-aromatic structure, complementing the rosemary and basil notes.
Chemistry, Properties & Perfumer Guide
The Chemistry
3-Methylbutanal diethyl acetal belongs to the acetal class of compounds, formed by the reaction of 3-methylbutanal with ethanol. Its synthesis typically involves acid-catalyzed acetalization under controlled conditions. The molecule’s stability comes from its protected aldehyde group, which prevents oxidation while allowing controlled release of the fruity aldehyde character during fragrance evaporation.
Physical & Chemical Properties
| Boiling Point | Not publicly available |
|---|---|
| Density | Not publicly available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Adds fresh top notes |
| Body Care | 0.1-1% | Up to 3% | Provides clean scent profile |
Classic Accords
Tip: Use with citrus oils to enhance freshness or with woody notes to create naturalistic green effects.
Alternatives & Comparisons
When a greener, leafier character is desired without the fruity aspects.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted under current IFRA standards.
EU Allergen Declaration
Not listed as an EU allergen.
RIFM Assessment
No significant safety concerns identified by RIFM.
Sustainability
As a synthetic material, 3-Methylbutanal diethyl acetal reduces pressure on natural resources. Its production can be optimized for energy efficiency, and it doesn’t contribute to deforestation or habitat loss associated with some natural materials.
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References
- PubChem Compound Summary for 3-Methylbutanal diethyl acetal PubChem
- Bauer, K. et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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