Spiro[1,3-dioxolane-2,8′(5’H)-[2H-2,4a]methanonaphthalene], hexahydro-1′,1′,5′,5′-tetramethyl- (CAS 154171-76-3) — Woody Base Note Fragrance Ingredient
Spiro[1,3-dioxolane-2,8'(5'H)-[2H-2,4a]methanonaphthalene], hexahydro-1',1',5',5'-tetramethyl-
CAS 154171-76-3
What Is Spiro[1,3-dioxolane-2,8'(5'H)-[2H-2,4a]methanonaphthalene], hexahydro-1',1',5',5'-tetramethyl-?
Spiro[1,3-dioxolane-2,8′(5’H)-[2H-2,4a]methanonaphthalene], hexahydro-1′,1′,5′,5′-tetramethyl- is a synthetic fragrance ingredient used in modern perfumery. It contributes unique olfactory properties to fragrances. Consumers may encounter it in high-end perfumes and personal care products. This compound matters because it offers perfumers a novel way to create distinctive scent profiles, blending complexity with stability in formulations.
Safety Profile
GENERALLY SAFEWhat Does Spiro[1,3-dioxolane-2,8'(5'H)-[2H-2,4a]methanonaphthalene], hexahydro-1',1',5',5'-tetramethyl- Smell Like?
This synthetic molecule offers a complex olfactory profile, starting with a sharp, almost metallic top note that quickly evolves into a warm, woody heart. The dry-down reveals a subtle, slightly sweet balsamic character, reminiscent of aged woods and resins. Its behavior on skin is persistent, with a slow release that ensures longevity in fragrance compositions.
2D Molecular Structure
SMILES: [H]C12C(C)(C)C3CCC1(C3)C(C)(C)CCC21OCCO1
Chemistry, Properties & Perfumer Guide
The Chemistry
This synthetic molecule belongs to the spiro compounds class, characterized by their unique bridged ring structures. It is not known to occur naturally and is synthesized through specialized organic chemistry routes. The molecule’s rigidity and compact structure contribute to its distinctive olfactory properties and stability in formulations.
Physical & Chemical Properties
| Boiling Point | N/A |
|---|---|
| Density | N/A |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-3% | Up to 5% | Adds depth and longevity |
| Personal Care | 0.5-1% | Up to 2% | Used for stability |
Classic Accords
Tip: Use in small quantities to enhance woody and balsamic notes without overpowering.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions currently apply.
RIFM Assessment
No RIFM safety assessment currently available.
Sustainability
As a synthetic molecule, its production relies on petrochemical feedstocks. Future green chemistry routes may improve its sustainability profile. The compound’s stability may reduce environmental persistence concerns compared to some naturals.
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References
- PubChem Compound Summary for Spiro[1,3-dioxolane-2,8′(5’H)-[2H-2,4a]methanonaphthalene], hexahydro-1′,1′,5′,5′-tetramethyl- PubChem
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 154171-76-3Physical Properties
| Molecular Weight | 264.4 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 4.4🔬 PubChem |
| Boiling Point | 331 °C🔬 EPA CompTox |
| Vapor Pressure | 0 mmHg @ 25°C📊 OPERA |
| Flash Point | 105.1 °C🔬 EPA CompTox |
| log Kp (skin permeability) | -1.189💻 Calculated |
| SMILES | CC1(CCC2(C3C14CCC(C4)C3(C)C)OCCO2)C🔬 PubChem |
Volatility & Performance
| Fragrance Note | Base💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 11 / 5💻 Calculated |
Odor & Flavor
| Functional Groups | ether💻 RDKit |
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: DTXSID80920515
Physical Properties
| Molecular Weight | 264.409 g/mol🔬 EPA CompTox |
| Density | 1.022 g/cm^3📊 OPERA |
| Boiling Point | 296.709 °C📊 OPERA |
| Melting Point | 58.805 °C📊 OPERA |
| Flash Point | 114.697 °C📊 OPERA |
| Refractive Index | 1.524 Dimensionless📊 OPERA |
| Molar Volume | 248.773 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 5.084 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 5.084 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 5.084 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 8.41 Log10 unitless📊 OPERA |
| Water Solubility | 0 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.005 mmHg📊 OPERA |
| Surface Tension | 36.164 dyn/cm📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 18.46 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 2 count💻 Computed |
| Rotatable Bonds | 0 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 76.06 cm^3/mol📊 OPERA |
| Polarizability | 30.153 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.
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