2-Heptylcyclopentanone (CAS 0137-03-01) — Woody Base Note Fragrance Ingredient
2-Heptylcyclopentanone
CAS 0137-03-01
What Is 2-Heptylcyclopentanone?
2-Heptylcyclopentanone is a synthetic fragrance ingredient used in perfumes and scented products. It contributes a unique musky-woody character to formulations. This molecule matters because it helps create long-lasting base notes in fragrances, adding depth and complexity without being overpowering.
Safety Profile
GENERALLY SAFEWhat Does 2-Heptylcyclopentanone Smell Like?
2-Heptylcyclopentanone delivers a warm, musky-woody aroma with subtle animalic undertones. The scent evolves from an initial slightly fatty, nutty character to a dry, woody base reminiscent of sandalwood and ambergris. Its tenacity makes it valuable for anchoring fragrances, providing a soft diffusion that lingers on skin for hours without becoming cloying.
Chemistry, Properties & Perfumer Guide
The Chemistry
2-Heptylcyclopentanone belongs to the cyclic ketone class of fragrance compounds. It is exclusively synthetic, typically produced through cyclization reactions of appropriate aliphatic precursors. The molecule features a cyclopentanone core with a heptyl side chain, which contributes to its hydrophobic character and substantivity in fragrance applications.
Physical & Chemical Properties
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Base note fixative |
| Functional Fragrance | 0.1-1% | Up to 3% | Musky woody accent |
Classic Accords
Tip: Use sparingly to enhance woody accords without overwhelming other notes.
Alternatives & Comparisons
More expensive natural musk alternative with similar substantivity but different odor profile.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions currently apply to 2-heptylcyclopentanone.
RIFM Assessment
Limited safety assessment available through RIFM.
Sustainability
As a synthetic material, 2-heptylcyclopentanone avoids natural resource depletion concerns. Its production can be optimized for minimal environmental impact through green chemistry approaches. The molecule’s substantivity may reduce overall fragrance load requirements in formulations.
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