(5E)-3,5-dimethyloct-5-en-4-ol (CAS 2209852-19-5) — Green Top to Middle Note Fragrance Ingredient
(5E)-3,5-dimethyloct-5-en-4-ol
CAS 2209852-19-5
What Is (5E)-3,5-dimethyloct-5-en-4-ol?
(5E)-3,5-dimethyloct-5-en-4-ol is a synthetic fragrance ingredient used in modern perfumery to create fresh, green, and slightly woody accords. It’s found in body care products and fine fragrances. This molecule matters because it provides a unique balance between natural freshness and synthetic precision, allowing perfumers to craft innovative scents without relying solely on traditional materials.
Safety Profile
GENERALLY SAFEWhat Does (5E)-3,5-dimethyloct-5-en-4-ol Smell Like?
This molecule offers a crisp, green opening reminiscent of crushed leaves with a subtle metallic edge. As it evolves, it reveals a clean woody character akin to freshly cut bamboo, with a faintly marine dry-down that lingers close to the skin. The overall effect is modern and minimalist – like sunlight filtering through a glass greenhouse.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as a structural green note to create an urban garden effect, blending with violet leaf and ozone accords.
Forms the crisp top note that contrasts with deeper earthy bases, providing lift without citrus.
Chemistry, Properties & Perfumer Guide
The Chemistry
A synthetic monoterpenoid alcohol with a branched carbon skeleton. The E-configuration at the 5-position creates its characteristic clean green odor. Typically synthesized through controlled aldol condensation reactions followed by selective reduction. The molecule’s chirality significantly impacts its odor profile, with the (5E,4R) isomer being most valued in perfumery.
Physical & Chemical Properties
| Boiling Point | Estimated 210-220°C |
|---|---|
| Density | Estimated 0.86-0.88 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-3% | Up to 5% | Provides modern green character |
| Body Care | 0.5-1.5% | Up to 2% | Adds freshness without citrus |
Classic Accords
Tip: Use with ionones to soften the metallic edge and extend longevity.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA. Listed on transparency list with no usage limits.
RIFM Assessment
Under evaluation by RIFM. Preliminary data suggests low sensitization potential.
Sustainability
Synthesized from petrochemical precursors with relatively low environmental impact. Energy-efficient production process compared to some natural alternatives. Fully biodegradable based on structural similarity to known compounds.
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References
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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