Tetrahydro-.alpha.-pentylfurfuryl acetate (CAS 67634-08-06) — Sweet Middle Note Fragrance Ingredient
Tetrahydro-.alpha.-pentylfurfuryl acetate
CAS 67634-08-06
What Is Tetrahydro-.alpha.-pentylfurfuryl acetate?
Tetrahydro-α-pentylfurfuryl acetate is a synthetic fragrance ingredient rarely encountered by consumers directly. It may appear in niche perfumes or industrial fragrances. This compound matters to perfumers for its unique ability to modify and enhance fruity-floral accords, providing subtle complexity where traditional ingredients fall short.
Safety Profile
PROFESSIONAL USEWhat Does Tetrahydro-.alpha.-pentylfurfuryl acetate Smell Like?
This obscure synthetic offers a paradoxical olfactive profile – simultaneously waxy and diffusive, like the memory of ripe tropical fruit seen through frosted glass. Initial impressions suggest overripe pineapple skins macerated in mineral oil, drying down to a faintly metallic, almost ionone-like whisper. The late-stage dryout reveals unexpected kinship with certain macrocyclic musks, though with significantly less tenacity.
Chemistry, Properties & Perfumer Guide
The Chemistry
Tetrahydro-α-pentylfurfuryl acetate belongs to the furan derivatives class, synthesized through hydrogenation of furfural derivatives followed by acetylation. The pentyl side chain introduces significant lipophilicity while the tetrahydrofuran core provides structural rigidity. No natural occurrence has been documented. Synthesis typically proceeds via catalytic hydrogenation of amylfurfuryl alcohol precursors under pressure, followed by standard acetylation protocols. The stereochemistry of the tetrahydrofuran ring may influence odor characteristics but remains poorly characterized in literature.
Physical & Chemical Properties
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.1-0.5% | Up to 1% | Used as nuance enhancer |
| Functional Fragrance | 0.01-0.1% | Up to 0.3% | Restricted to industrial applications |
Classic Accords
Tip: Use micro-doses in complex bases to avoid waxy off-notes.
Alternatives & Comparisons
More conventional furan derivative with brighter, coffee-like character suitable when less diffusion is needed.
Provides similar structural elements without the waxy acetate note, though with reduced tenacity.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently evaluated by IFRA due to limited commercial use.
RIFM Assessment
No RIFM assessment available.
Sustainability
As a fully synthetic material produced in limited quantities, environmental impact is presumed minimal but unquantified. The multi-step synthesis raises energy consumption concerns compared to simpler fragrance molecules. No known renewable feedstock routes exist for current production methods.
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