Cyclohexene, 3-methylene- (CAS 1888-90-0) — Green Top Note Fragrance Ingredient
Cyclohexene, 3-methylene-
CAS 1888-90-0
What Is Cyclohexene, 3-methylene-?
Cyclohexene, 3-methylene- is a synthetic fragrance ingredient used in modern perfumery to create fresh, green, and slightly woody accords. You might encounter it in air fresheners and functional fragrances. While not as widely known as natural ingredients, it plays a crucial role in creating crisp, clean scent profiles that mimic outdoorsy freshness without relying on plant extracts.
Safety Profile
GENERALLY SAFEWhat Does Cyclohexene, 3-methylene- Smell Like?
This synthetic molecule delivers a sharp, piercing greenness reminiscent of snapped twigs and crushed leaves, with a subtle metallic edge. The initial burst evolves into a cleaner, more transparent woody character – like the scent left on hands after gardening with freshly oiled tools. Unlike natural materials, it maintains linearity without sweetening over time, making it ideal for functional fragrances requiring stability.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used in reformulations to replace galbanum, contributing to the iconic crushed-leaf effect without relying on natural variability. Provides the razor-sharp green top note that defines this classic.
Enhances the aromatic freshness in this functional fragrance, pairing with synthetic musks to create an invigorating, long-lasting green accord that survives frequent product use.
Chemistry, Properties & Perfumer Guide
The Chemistry
As a simple cyclohexene derivative, 3-methylenecyclohexene belongs to the class of unsaturated alicyclic hydrocarbons. The molecule features a reactive exocyclic double bond that contributes to its sharp olfactory character. Industrially produced through acid-catalyzed reactions of cyclohexanol derivatives, its synthesis avoids the sustainability challenges of harvesting natural green materials like galbanum or violet leaf absolute.
Physical & Chemical Properties
| Appearance | Colorless liquid |
|---|---|
| Boiling Point | Approx. 130-140°C (estimated) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Functional Fragrances | 0.5-2% | Up to 5% | Provides clean green effects |
| Fine Fragrance | 0.1-0.5% | Up to 1% | Used as green modifier |
Classic Accords
Tip: Stabilize with antioxidants if using in products containing bleach or other oxidizers.
Alternatives & Comparisons
More diffusive and less harsh green note with apple-like facets, suitable when a softer effect is desired without losing projection.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA. No specific use limits established.
RIFM Assessment
Not currently evaluated by RIFM due to limited commercial use history.
Sustainability
As a purely synthetic material, production avoids agricultural land use and seasonal variability. However, as a petrochemical derivative, its environmental impact depends on manufacturing energy sources. Some producers are exploring bio-based routes using renewable feedstocks.
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References
- Arctander, S. (1969). Perfume and Flavor Chemicals. Montclair, NJ.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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