Ethanone, 1-(4,11,11,-trimethyl-8-methylenebicyclo[7.2.0]undec-4-enyl)-[1R-(1a,4E,9b] (CAS 70801-04-06) — Woody Base Note Fragrance Ingredient
Ethanone, 1-(4,11,11,-trimethyl-8-methylenebicyclo[7.2.0]undec-4-enyl)-[1R-(1a,4E,9b]
CAS 70801-04-06
What Is Ethanone, 1-(4,11,11,-trimethyl-8-methylenebicyclo[7.2.0]undec-4-enyl)-[1R-(1a,4E,9b]?
This synthetic fragrance ingredient is a specialized ketone compound used in modern perfumery to add woody-amber nuances. You’ll encounter it in niche and designer fragrances where it contributes to sophisticated dry-down effects. It matters because it helps create long-lasting amber and woody accords without relying solely on natural materials, offering perfumers more creative control over scent profiles.
Safety Profile
USE WITH AWARENESSWhat Does Ethanone, 1-(4,11,11,-trimethyl-8-methylenebicyclo[7.2.0]undec-4-enyl)-[1R-(1a,4E,9b] Smell Like?
Presents a complex woody-ambery character with subtle animalic undertones. Opens with a dry cedar-like sharpness that evolves into a warm, slightly sweet amber heart. The dry-down reveals a musky-balsamic depth reminiscent of aged woods and leather. Acts as a powerful fixative, enhancing longevity while adding a sophisticated resinous quality to compositions. Works particularly well in oriental and woody fragrances where it provides a smooth transition between top notes and base materials.
Chemistry, Properties & Perfumer Guide
The Chemistry
A bicyclic unsaturated ketone belonging to the amber-woody odorant class. Synthesized through Diels-Alder reactions involving terpene precursors followed by selective oxidation. The rigid bicyclic structure contributes to its excellent stability and tenacity in fragrance applications. The methylene group at position 8 and ketone functionality create a unique electronic environment that produces its characteristic odor profile.
Physical & Chemical Properties
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Base note modifier |
| Home Care | 0.1-0.5% | Up to 1% | Longevity enhancer |
Classic Accords
Tip: Use in trace amounts initially due to potency – overdosing can overwhelm delicate compositions.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No current IFRA restrictions. Listed on IFRA Transparency List.
RIFM Assessment
Under evaluation by RIFM as of 2023.
Sustainability
Synthetic production allows for consistent quality without natural resource depletion. Manufacturing process optimized for minimal waste generation. Not bioaccumulative based on current data.
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