(.+-.)-Tetrahydro-2,6,6-trimethyl-2-vinyl-2H-pyrane (CAS 13837-56-4) — Woody Base Note Fragrance Ingredient
(.+-.)-Tetrahydro-2,6,6-trimethyl-2-vinyl-2H-pyrane
CAS 13837-56-4
What Is (.+-.)-Tetrahydro-2,6,6-trimethyl-2-vinyl-2H-pyrane?
This synthetic molecule is a versatile fragrance ingredient found in modern perfumes, often imparting a fresh, woody, and slightly fruity character. It matters because it helps create long-lasting scent profiles without relying on natural extracts, making fragrances more sustainable and consistent.
Safety Profile
GENERALLY SAFEWhat Does (.+-.)-Tetrahydro-2,6,6-trimethyl-2-vinyl-2H-pyrane Smell Like?
This molecule delivers a crisp, woody aroma with subtle fruity undertones, reminiscent of freshly cut green stems and a hint of ripe berries. Over time, it evolves into a warm, slightly sweet base note, providing depth and longevity to fragrances. Its dry-down is smooth and persistent, making it a favorite for modern scent compositions.
2D Molecular Structure
SMILES: CC1(C)CCCC(C)(O1)C=C
Chemistry, Properties & Perfumer Guide
The Chemistry
This synthetic molecule belongs to the pyrane class, known for their woody and fruity olfactory properties. It is typically synthesized through catalytic processes involving vinylation and trimethylation reactions. Its structure allows for excellent stability and longevity in fragrance formulations.
Physical & Chemical Properties
| Boiling Point | N/A |
|---|---|
| Density | N/A |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 2-5% | Up to 10% | Adds woody depth |
| Home Fragrance | 1-3% | Up to 5% | Enhances longevity |
Classic Accords
Tip: Use in small amounts to add woody depth without overpowering other notes.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No restrictions under IFRA standards.
RIFM Assessment
RIFM assessment confirms safe use in current applications.
Sustainability
Synthetic production reduces reliance on natural resources, offering a more sustainable option. Its consistent quality minimizes batch variability, reducing waste.
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References
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 13837-56-4Physical Properties
| Molecular Weight | 154.25 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 2.4🔬 PubChem |
| log Kp (skin permeability) | -1.937💻 Calculated |
Physical data: PubChem (NIH/NLM), U.S. EPA CompTox Dashboard, EPA OPERA models, RDKit. Odor & flavor: Arctander (Perfume & Flavor Chemicals), Fenaroli's Handbook of Flavor Ingredients, Leffingwell. Thresholds: van Gemert (Compilations of Odour Threshold Values). Regulatory: IFRA Standards 51st, FEMA GRAS. Trade names: Surburg (Common Fragrance & Flavor Materials). All data compiled and cross-referenced for perfumertools.com.
Physicochemical Properties
DTXSID: DTXSID8051338
Physical Properties
| Molecular Weight | 154.253 g/mol🔬 EPA CompTox |
| Density | 0.863 g/cm^3🔬 PubChem |
Partition & Solubility
| LogP (Octanol-Water) | 2.91 dimensionless💻 Computed |
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 | 0 count💻 Computed |
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.
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