3-Methyl-3-butenyl acetate (CAS 5205-07-02) — Green Top-middle Note Fragrance Ingredient
3-Methyl-3-butenyl acetate
CAS 5205-07-02
What Is 3-Methyl-3-butenyl acetate?
3-Methyl-3-butenyl acetate is a synthetic fragrance ingredient with a fresh, fruity-green aroma. Commonly found in household cleaners and personal care products for its uplifting qualities. This ester adds a crisp, slightly tropical nuance that enhances freshness without overpowering, making it popular in functional fragrances. Its stability and moderate volatility provide reliable performance in various formulations.
Safety Profile
GENERALLY SAFEWhat Does 3-Methyl-3-butenyl acetate Smell Like?
Opens with a burst of green apple peel and underripe banana, transitioning to a dewy stemness reminiscent of freshly snapped pea pods. The dry-down reveals a whisper of pineapple core—not sugary, but the tart white part near the rind. Airy and transparent, it behaves like a more diffusive version of cis-3-hexenyl acetate.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used to amplify the crushed leaf effect in the citrus-floral accord, contributing to the fragrance’s signature ‘just-steamed’ freshness.
Provides a wet vegetal accent that complements the ginger and cardamom, mimicking the scent of rain-drenched tropical foliage.
Chemistry, Properties & Perfumer Guide
The Chemistry
An ester formed from 3-methyl-3-buten-1-ol and acetic acid. Industrially produced via acid-catalyzed esterification. The branched chain structure reduces volatility compared to linear analogs while maintaining good diffusion. Lacks chiral centers, simplifying synthesis. Shows stability in pH ranges typical for cosmetic applications (3-8).
Physical & Chemical Properties
| Molecular Weight | 142.20 g/mol |
|---|---|
| Boiling Point | ~180-185 °C (est.) |
| Density | ~0.89 g/cm³ (est.) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fabric Care | 0.5-2% | Up to 5% | Imparts ‘outdoor freshness’ character |
| Shampoos | 0.2-1% | Up to 3% | Adds non-citrus brightness |
Classic Accords
Tip: Use with hedione to extend freshness and prevent harsh green notes from dominating.
Alternatives & Comparisons
More intense ‘cut grass’ effect but shorter-lasting. Switch when naturalistic greenness is prioritized over fruity aspects.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted under any IFRA standards.
RIFM Assessment
RIFM reviewed – no significant safety concerns at typical use levels.
Sustainability
Synthesized from petrochemical feedstocks. Carbon footprint comparable to other acetate esters. Biodegradation studies suggest moderate environmental persistence (60% degradation in 28 days).
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References
- Fenaroli’s Handbook of Flavor Ingredients (6th ed.) ISBN 0849330346
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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