2-NONYN-1-AL DIMETHYLACETAL
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
2-NONYN-1-AL DIMETHYLACETAL is a cosmetic ingredient used in product formulation. Exercise caution due to limited available safety data.
2-Nonyn-1-al Dimethylacetal is an acetal of a C9 acetylenic aldehyde (2-nonynal). The acetal group provides stability compared to the free aldehyde, as acetals hydrolyze slowly to release the parent aldehyde. The non-2-ynyl (acetylenic) group is metabolically unusual and raises concerns for bioactivation. It is listed in EU Annex III of the Cosmetics Regulation as a fragrance allergen, requiring declaration when present above threshold concentrations. The H317 classification confirms skin sensitization potential.
Skin benefits
- Provides fatty, green, waxy, and violet-type fragrance notes
- Used in sophisticated floral and green compositions
Known concerns
- Skin sensitizer (H317)
- EU Annex III fragrance allergen requiring declaration
- Acetylenic structure may undergo metabolic activation
- Acetal hydrolysis releases the parent aldehyde over time
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.