Octahydro-8,8-dimethylnaphthalene-2-carbaldehyde (CAS 68738-94-3) — Woody Middle to base Note Fragrance Ingredient
Octahydro-8,8-dimethylnaphthalene-2-carbaldehyde
CAS 68738-94-3
What Is Octahydro-8,8-dimethylnaphthalene-2-carbaldehyde?
Octahydro-8,8-dimethylnaphthalene-2-carbaldehyde is a synthetic fragrance molecule used in perfumery to add woody, amber-like nuances. It’s found in premium perfumes and body care products where a warm, sophisticated scent is desired. This ingredient helps create depth and longevity in fragrances, making it valuable for perfumers crafting complex, evolving scents that transition beautifully from first spray to dry-down.
Safety Profile
USE WITH AWARENESSWhat Does Octahydro-8,8-dimethylnaphthalene-2-carbaldehyde Smell Like?
This aldehyde delivers a rich, woody character with facets of warm amber and subtle powdery undertones. Initially presents with a slightly sharp, almost camphoraceous edge that quickly mellows into a smooth, velvety base reminiscent of aged woods and sweet resins. The dry-down reveals a sophisticated skin-scent quality with excellent persistence, making it particularly useful for anchoring fragrance compositions without overwhelming other notes.
2D Molecular Structure
SMILES: CC1(C)CCCC2C=CC(CC12)C=O
Chemistry, Properties & Perfumer Guide
The Chemistry
Octahydro-8,8-dimethylnaphthalene-2-carbaldehyde belongs to the family of cyclic terpene aldehydes. While not found in nature, its structure mimics certain woody-amber molecules found in natural materials. Industrial synthesis typically begins with camphene or similar terpene precursors through oxidation pathways. The molecule’s rigid bicyclic structure contributes to its excellent stability and tenacity in fragrance applications.
Physical & Chemical Properties
| Appearance | Clear liquid |
|---|---|
| Odor Strength | Medium to strong |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Used as woody-amber modifier |
| Home Care | 0.1-0.5% | Up to 1% | For warm background notes |
Classic Accords
Tip: Use with citrus top notes to prevent excessive heaviness in the opening.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA. No specific usage limits established.
RIFM Assessment
Full safety assessment not yet published by RIFM.
Sustainability
As a synthetic material, this ingredient doesn’t rely on natural resource extraction. However, its production involves petrochemical feedstocks and energy-intensive processes. Some manufacturers are exploring green chemistry approaches to reduce environmental impact during synthesis.
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Physicochemical Properties
DTXSID: DTXSID3051549
Physical Properties
| Molecular Weight | 192.302 g/mol🔬 EPA CompTox |
| Density | 0.965 g/cm^3📊 OPERA |
| Boiling Point | 258.36 °C📊 OPERA |
| Melting Point | 29.043 °C📊 OPERA |
| Flash Point | 97.864 °C📊 OPERA |
| Refractive Index | 1.519 Dimensionless📊 OPERA |
| Molar Volume | 196.711 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.868 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 3.868 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.868 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 6.13 Log10 unitless📊 OPERA |
| Water Solubility | 0 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.03 mmHg📊 OPERA |
| Viscosity | 4.471 cP📊 OPERA |
| Surface Tension | 31.988 dyn/cm📊 OPERA |
| Thermal Conductivity | 121.811 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 17.07 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 1 count💻 Computed |
| Rotatable Bonds | 1 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 59.704 cm^3/mol📊 OPERA |
| Polarizability | 23.668 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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