2-Butyltetrahydro-6-methyl-4-methylene-2H-pyrane (CAS 24237-02-03) — Woody Base Note Fragrance Ingredient
2-Butyltetrahydro-6-methyl-4-methylene-2H-pyrane
CAS 24237-02-03
What Is 2-Butyltetrahydro-6-methyl-4-methylene-2H-pyrane?
2-Butyltetrahydro-6-methyl-4-methylene-2H-pyrane is a synthetic fragrance compound rarely encountered by consumers directly. It may appear in certain modern perfumes as a subtle woody-amber note. This ingredient matters to perfumers for its ability to add dry, resinous depth without overwhelming compositions, making it useful in unisex and avant-garde fragrances.
Safety Profile
USE WITH AWARENESSWhat Does 2-Butyltetrahydro-6-methyl-4-methylene-2H-pyrane Smell Like?
This synthetic pyrane derivative offers a dry, woody character with subtle ambery undertones. Initially presenting a crisp, almost paper-like sharpness, it evolves into a warm, slightly camphoraceous heart. The dry-down reveals a faintly musky, skin-like quality that adds subtle persistence. More diffusive than powerful, it behaves like fine-grained sandalwood sawdust blended with the dry mineralic quality of sun-warmed stones.
Chemistry, Properties & Perfumer Guide
The Chemistry
As a synthetic pyrane derivative, this compound belongs to the heterocyclic ether class. The butyl side chain contributes to its lipophilicity while the methylene group adds structural rigidity. Synthesized through acid-catalyzed cyclization of appropriate diene precursors, its production requires careful control of stereochemistry to avoid unwanted byproducts. The tetrahydro core provides stability while allowing sufficient volatility for perfumery applications.
Physical & Chemical Properties
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 3% | Used as dry woody modifier |
| Functional Fragrance | 0.1-0.5% | Up to 1% | Adds subtle persistence |
Classic Accords
Tip: Use in trace amounts to add dryness without dominating the composition.
Alternatives & Comparisons
More widely available woody-amber with better diffusion profile for mainstream applications.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions. General guidelines for pyrane derivatives apply.
RIFM Assessment
Not currently evaluated by RIFM. Considered low priority due to limited usage.
Sustainability
As a purely synthetic material, this compound avoids natural resource depletion concerns. Production requires standard petrochemical feedstocks with no known environmental hazards during synthesis or disposal. Energy efficiency depends on the specific manufacturing process employed.
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