2,4-Dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin (CAS 27606-09-03) — Woody Middle to base Note Fragrance Ingredient
2,4-Dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin
CAS 27606-09-03
What Is 2,4-Dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin?
2,4-Dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin is a synthetic fragrance ingredient used in modern perfumery to add unique woody-ambery nuances. It’s found in select niche fragrances where innovative accords are desired. This compound helps perfumers create contemporary scent profiles that bridge traditional and avant-garde styles, offering a subtle complexity that enhances depth without overwhelming other notes.
Safety Profile
PROFESSIONAL USEWhat Does 2,4-Dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin Smell Like?
This synthetic molecule presents a sophisticated interplay of woody and ambery facets with a subtle metallic edge. Initially crisp and slightly camphoraceous, it evolves into a warm, textured base reminiscent of aged oak barrels with a whisper of leather. The dry-down reveals a lingering mineralic quality that provides excellent tenacity in complex compositions.
Chemistry, Properties & Perfumer Guide
The Chemistry
2,4-Dimethyl-4,4a,5,9b-tetrahydroindeno[1,2-d]-1,3-dioxin belongs to the class of heterocyclic oxygen compounds with a fused indene-dioxane structure. Its synthesis typically involves [4+2] cycloaddition reactions of appropriate diene precursors with carbonyl compounds. The rigid bicyclic framework contributes to its stability and distinctive odor profile.
Physical & Chemical Properties
| Appearance | Clear to pale yellow liquid |
|---|---|
| Molecular Weight | Not specified |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Used as a nuance enhancer |
| Functional Fragrance | 0.1-0.5% | Up to 1% | Limited use due to intensity |
Classic Accords
Tip: Use sparingly in woody-amber bases to add structural depth without dominating the composition.
Alternatives & Comparisons
Offers similar ambery depth with better-known safety profile and more predictable performance in formulations.
Provides comparable woody diffusion with greater formulation flexibility and wider usage limits.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA. Professional assessment recommended due to limited safety data.
RIFM Assessment
No published RIFM assessment currently available for this compound.
Sustainability
As a synthetic material, this compound is produced through controlled chemical processes with minimal environmental impact compared to natural extraction methods. The manufacturing process can be optimized for atom economy, though specific life cycle assessment data is not publicly available for this niche material.
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