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2-ETHYLPENTYL-1,3-DIOXOLANE.

Optional CAS 4359-47-1 / PERFUMING

A cyclic acetal fragrance compound that delivers fresh, green, and metallic aromatic notes to cosmetic formulations. Known in the industry as Syvertal, this oil-soluble ingredient contributes to both scent profiles and textural enhancement in personal care products.

Perfuming

Science

Functions as a volatile fragrance molecule that provides olfactory enhancement through its unique green and fresh-cut stem aromatic profile. As a cyclic acetal structure, it contributes to the dewy texture sensation while delivering controlled fragrance release in formulations.


Research

High confidence
Effective range 0.095–5%
Optimal

0.095%

Key findings

  1. 01 Human Repeat Insult Patch Test on 51 subjects at 5% concentration demonstrated no skin irritation or sensitization reactions
  2. 02 Industry exposure modeling indicates 0.095% as the 95th percentile usage concentration in fine fragrances

Transparency

Not commonly dusted

As a fragrance ingredient with established industry usage patterns, dusting is not a common concern for this compound


The Formula

Solubility
Oil
Optimal pH 6 – 8.5
0 7 14

Stability

Exhibits acid sensitivity due to acetal structure; may undergo hydrolysis to 2-ethylhexanal and ethylene glycol under acidic conditions. Maintains stability in neutral to mildly alkaline environments.

Conflicts

  • Strong acids
  • Strong oxidizing agents
  • Formulations below pH 5

Safety

CIR Status
Not reviewed by CIR
Max tested
10%
Sensitization risk Moderate

Regulated by IFRA with 10% maximum concentration within fragrance compounds. ECHA classification indicates potential skin sensitization (H317). Safety testing at 5% showed no irritation or sensitization in controlled studies.


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Optional

A specialized fragrance ingredient suitable for non-sensitive skin types, offering unique green aromatic notes with good safety profile at appropriate concentrations.


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