2-Cyclopentene-1-acetic acid, ethyl ester (CAS 15848-49-4) — Green Top to middle Note Fragrance Ingredient
2-_Cyclopentene-_1-_acetic acid, ethyl ester
CAS 15848-49-4
What Is 2-_Cyclopentene-_1-_acetic acid, ethyl ester?
2-Cyclopentene-1-acetic acid, ethyl ester is a synthetic fragrance compound primarily used in perfumery. Consumers might encounter it as a subtle component in modern floral or fruity fragrances. This ingredient matters because it contributes unique green-fruity nuances that help perfumers create fresh, contemporary scent profiles.
Safety Profile
GENERALLY SAFEWhat Does 2-_Cyclopentene-_1-_acetic acid, ethyl ester Smell Like?
This ester delivers a crisp, green-fruity character reminiscent of unripe apples and freshly cut stems. The initial burst carries a slightly tart, berry-like quality that evolves into a cleaner, more floral heart. As it dries down, it leaves a subtle woody-herbaceous trail that blends well with other green notes. The overall effect is like walking through an orchard after rain – dewy, slightly tart, and alive with vegetative energy.
Chemistry, Properties & Perfumer Guide
The Chemistry
2-Cyclopentene-1-acetic acid, ethyl ester belongs to the class of cyclic unsaturated esters. While not found in nature, it’s synthesized through esterification reactions of cyclopentene derivatives. The molecule features a cyclopentene ring with an acetic acid ethyl ester side chain, creating its distinctive green-fruity odor profile. Its reactivity is typical of unsaturated esters, making it useful for creating more complex fragrance molecules through additional chemical modifications.
Physical & Chemical Properties
| Boiling Point | Not available |
|---|---|
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Green-fruity modifier |
| Functional Fragrance | 0.1-1% | Up to 3% | Freshness booster |
Classic Accords
Tip: Use as a bridge between citrus top notes and floral heart notes in fresh compositions.
Alternatives & Comparisons
Offers similar green-fruity character with more pronounced apple-like tones.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions currently apply to this material.
RIFM Assessment
No RIFM safety assessment currently available for this material.
Sustainability
As a synthetic material, this ester has minimal environmental impact in production. Being petroleum-derived, its sustainability depends on the energy sources used in manufacturing. Future green chemistry approaches could improve its ecological profile through bio-based feedstocks or more efficient synthesis routes.
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