4-Penten-1-one, 1-spiro[4.5]dec-6-en-7-yl- (CAS 224031-71-4) — Green Middle Note Fragrance Ingredient
4-Penten-1-one, 1-spiro[4.5]dec-6-en-7-yl-
CAS 224031-71-4
What Is 4-Penten-1-one, 1-spiro[4.5]dec-6-en-7-yl-?
4-Penten-1-one, 1-spiro[4.5]dec-6-en-7-yl- is a synthetic fragrance ingredient used in niche perfumery. It contributes unique woody-green notes with subtle fruity undertones. Encountered in avant-garde fragrances seeking unconventional aroma profiles. This molecule matters because it exemplifies modern perfumery’s ability to create entirely novel scent experiences through synthetic chemistry, expanding the perfumer’s palette beyond natural extracts.
Safety Profile
USE WITH AWARENESSWhat Does 4-Penten-1-one, 1-spiro[4.5]dec-6-en-7-yl- Smell Like?
Opens with a sharp, almost metallic greenness reminiscent of crushed vine leaves, quickly revealing a paradoxical fruity-waxy character like unripe banana peel. The heart develops into a damp woody accord with hints of mushroom cellar and freshly cut pine. Dry-down leaves a faintly animalic muskiness that lingers close to skin.
Chemistry, Properties & Perfumer Guide
The Chemistry
A spirocyclic ketone with complex stereochemistry. The spiro junction between cyclopentene and cyclohexenone rings creates constrained molecular geometry that influences odor perception. Synthesized through Robinson annulation variations, often starting from cyclopentanone derivatives. The pentenone side chain introduces additional reactivity sites for further functionalization.
Physical & Chemical Properties
| Molecular Weight | 192.25 g/mol |
|---|---|
| XLogP | 2.8 (estimated) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Conceptual Fragrances | 0.1-0.5% | Up to 1% | Used for avant-garde effects |
| Functional Fragrances | Not used | N/A | Too unconventional for mass market |
Classic Accords
Tip: Use micro-doses with powerful fixatives to tame the green sharpness.
Alternatives & Comparisons
Fruitier alternative with better blending properties in floral compositions.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No current IFRA restrictions. Monitoring status due to limited toxicological data.
RIFM Assessment
Not yet evaluated by RIFM. Recommended for professional use only until full assessment.
Sustainability
Synthesized from petrochemical precursors using energy-intensive processes. No known natural sources. Being a novel synthetic, its environmental fate is poorly characterized. Recommended for minimal use until full lifecycle assessment available.
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References
- PubChem Compound Summary CID 22403171-4 PubChem
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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