3,6-Dihydro-2,4-dimethyl-6-phenyl-2H-pyran (CAS 68039-40-7) — Woody Middle to base Note Fragrance Ingredient
3,6-Dihydro-2,4-dimethyl-6-phenyl-2H-pyran
CAS 68039-40-7
What Is 3,6-Dihydro-2,4-dimethyl-6-phenyl-2H-pyran?
3,6-Dihydro-2,4-dimethyl-6-phenyl-2H-pyran is a synthetic fragrance ingredient used in modern perfumery to add unique aromatic qualities. It’s found in niche and avant-garde fragrances, often as a subtle modifier. This compound matters because it represents perfumery’s cutting edge – allowing creators to craft scents that don’t exist in nature, pushing olfactory boundaries while maintaining safety standards through rigorous testing.
Safety Profile
USE WITH AWARENESSWhat Does 3,6-Dihydro-2,4-dimethyl-6-phenyl-2H-pyran Smell Like?
This synthetic molecule offers a complex aromatic profile – imagine the dry crackle of birch bark meeting the faintest whisper of overripe stone fruits. Initially presents with a sharp, almost metallic top note that quickly mellows into a warm, woody-amber heart. The dry-down reveals subtle phenolic undertones reminiscent of aged whisky barrels, with a persistent sweet-powdery trail that lingers close to skin. Unusual in structure, it behaves like a chameleon – amplifying floral notes in some contexts while adding depth to woody accords in others.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as the sole featured ingredient, showcasing its transformative dry-down from sharp to velvety-soft. The minimalist approach highlights how single molecules can create complex scent experiences through temporal evolution.
Employed as a green-modifier, lending a futuristic ‘electric foliage’ effect that bridges natural galbanum with ultra-modern aromachemicals. Creates the illusion of chlorophyll without actual plant extracts.
2D Molecular Structure
SMILES: CC1CC(C)=CC(O1)C1=CC=CC=C1
Chemistry, Properties & Perfumer Guide
The Chemistry
As a dihydropyran derivative, this compound belongs to the heterocyclic oxygen-containing class of fragrance materials. The phenyl substitution at the 6-position introduces aromatic character while the methyl groups influence volatility. Synthesized through acid-catalyzed cyclization of appropriate dienol precursors, its production requires careful control to avoid unwanted polymerization. The molecule’s semi-rigid structure contributes to its unusual odor persistence – the phenyl ring provides anchoring while the pyran oxygen offers hydrogen bonding sites.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Molecular Weight | ~190 g/mol (estimated) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Used as an effect modifier rather than main note |
| Functional Fragrance | 0.1-0.5% | Up to 1% | Adds sophisticated dry-down in detergents |
Classic Accords
Tip: Best added during the heart phase of compounding to allow proper integration with both top and base materials.
Alternatives & Comparisons
For brighter, more citrus-floral applications where less phenolic character is desired. Higher volatility makes it better for top notes.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted under any IFRA standards. Listed on IFRA Transparency List with no usage limitations specified.
RIFM Assessment
Under evaluation by RIFM as part of ongoing novel materials assessment program.
Sustainability
As a purely synthetic material, its production avoids agricultural land use but depends on petrochemical feedstocks. Manufacturing processes typically employ green chemistry principles to minimize waste. Unlike natural ingredients, supply isn’t subject to crop failures or climate variability.
Explore 3,6-Dihydro-2,4-dimethyl-6-phenyl-2H-pyran
Browse essential oils and aroma compounds.
Browse on iHerb →Affiliate disclosure: we may earn a small commission at no extra cost to you.
References
- IFRA Transparency List (2023). International Fragrance Association. IFRA Official
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID90867447
Physical Properties
| Molecular Weight | 188.27 g/mol🔬 EPA CompTox |
| Density | 0.985 g/cm^3📊 OPERA |
| Boiling Point | 274.023 °C📊 OPERA |
| Melting Point | 49.409 °C📊 OPERA |
| Flash Point | 110.991 °C📊 OPERA |
| Refractive Index | 1.514 Dimensionless📊 OPERA |
| Molar Volume | 192.951 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.129 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 3.129 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.129 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 6.36 Log10 unitless📊 OPERA |
| Water Solubility | 0.001 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.005 mmHg📊 OPERA |
| Viscosity | 7.085 cP📊 OPERA |
| Surface Tension | 34.145 dyn/cm📊 OPERA |
| Thermal Conductivity | 126.706 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 9.23 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 1 count💻 Computed |
| Rotatable Bonds | 1 count💻 Computed |
| Aromatic Rings | 1 count💻 Computed |
| Molar Refractivity | 58.124 cm^3/mol📊 OPERA |
| Polarizability | 23.042 Å^3📊 OPERA |
Data Sources:
🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.
