1H-Indene, 2,3-dihydro-1,1,2,3,3-pentamethyl- (CAS 1203-17-4) — Woody Base Note Fragrance Ingredient
1H-Indene, 2,3-dihydro-1,1,2,3,3-pentamethyl-
CAS 1203-17-4
What Is 1H-Indene, 2,3-dihydro-1,1,2,3,3-pentamethyl-?
1H-Indene, 2,3-dihydro-1,1,2,3,3-pentamethyl- is a synthetic aromatic compound used in modern perfumery to add woody and ambery nuances. It’s found in niche fragrances seeking unconventional dry-down effects. This ingredient matters as a building block for complex amber accords, providing warmth without being overly sweet or powdery like traditional amber materials.
Safety Profile
USE WITH AWARENESSWhat Does 1H-Indene, 2,3-dihydro-1,1,2,3,3-pentamethyl- Smell Like?
This synthetic molecule opens with a sharp, almost metallic woody character that quickly settles into a dry ambery warmth. Imagine the scent of sun-baked driftwood with a whisper of motor oil sophistication. As it evolves, it reveals a subtle leathery undertone that lingers like the memory of an old library binding. The dry-down is surprisingly smooth for such a complex structure, leaving behind a clean woody-amber signature that never becomes cloying.
Chemistry, Properties & Perfumer Guide
The Chemistry
1H-Indene, 2,3-dihydro-1,1,2,3,3-pentamethyl- belongs to the indane class of synthetic aromatics. Its pentamethyl substitution pattern creates a rigid molecular framework that contributes to its excellent stability in formulations. Industrially synthesized through Friedel-Crafts alkylation reactions, this material showcases how strategic methylation can dramatically alter odor characteristics while maintaining desirable performance properties.
Physical & Chemical Properties
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Amber/woody base note support |
| Functional Fragrance | 0.1-0.5% | Up to 1% | Background woody fixative |
Classic Accords
Tip: Use with ionones to soften its metallic edge while maintaining projection.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA standards.
RIFM Assessment
Not currently evaluated by RIFM due to limited commercial use history.
Sustainability
As a synthetic material, this compound is produced through petrochemical routes with standard industrial controls. Its potent odor profile means small quantities are required, reducing overall environmental burden compared to some natural amber materials. Future green chemistry approaches may offer more sustainable synthesis pathways.
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