Bicyclo[2.2.1]heptan-2-ol, 2-ethyl-1,3,3-trimethyl-, (1R,2R,4S)- (CAS 137255-07-3) — Woody Middle Note Fragrance Ingredient
Bicyclo[2.2.1]heptan-2-ol, 2-ethyl-1,3,3-trimethyl-, (1R,2R,4S)-
CAS 137255-07-3
What Is Bicyclo[2.2.1]heptan-2-ol, 2-ethyl-1,3,3-trimethyl-, (1R,2R,4S)-?
This synthetic compound is a versatile fragrance ingredient used in modern perfumery. It blends well with woody and amber accords. Consumers encounter it in high-end perfumes and personal care products for its unique olfactory properties. Its molecular structure allows for controlled release and longevity in fragrance formulations.
Safety Profile
GENERALLY SAFEWhat Does Bicyclo[2.2.1]heptan-2-ol, 2-ethyl-1,3,3-trimethyl-, (1R,2R,4S)- Smell Like?
This ingredient offers a complex olfactory profile, starting with a crisp, slightly camphoraceous top note that evolves into a warm, woody heart. The dry-down reveals a subtle amber-like sweetness with a clean, modern edge. Imagine the sharpness of freshly cut cedar meeting the warmth of sun-baked sandalwood.
2D Molecular Structure
SMILES: CC[C@]1(O)C(C)(C)[C@H]2CC[C@]1(C)C2
Chemistry, Properties & Perfumer Guide
The Chemistry
Bicyclo[2.2.1]heptan-2-ol is a synthetic terpenoid derivative with a rigid bicyclic structure. This molecule’s stereochemistry significantly impacts its odor profile, with the (1R,2R,4S)- isomer being the most commonly used in perfumery. It’s typically synthesized through hydrogenation of corresponding ketones or via Diels-Alder reactions followed by reduction.
Physical & Chemical Properties
| Boiling Point | Not available |
|---|---|
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 10% | Adds woody complexity |
| Personal Care | 0.5-2% | Up to 3% | Provides subtle warmth |
Classic Accords
Tip: Use to add modern woody character without overpowering other notes.
Alternatives & Comparisons
Natural alternative with richer woody profile but less consistency in composition.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions currently apply to this material.
EU Allergen Declaration
Not listed as an EU allergen.
RIFM Assessment
No specific RIFM assessment found for this compound.
Sustainability
As a synthetic material, this compound avoids natural resource depletion issues. Its production can be optimized for minimal environmental impact through green chemistry principles. The synthetic nature ensures consistent quality without seasonal variations affecting supply.
Explore Bicyclo[2.2.1]heptan-2-ol, 2-ethyl-1,3,3-trimethyl-, (1R,2R,4S)-
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References
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID50888633
Physical Properties
| Molecular Weight | 182.307 g/mol🔬 EPA CompTox |
| Density | 0.945 g/cm^3📊 OPERA |
| Boiling Point | 229.895 °C📊 OPERA |
| Melting Point | 81.339 °C📊 OPERA |
| Flash Point | 86.223 °C📊 OPERA |
| Refractive Index | 1.488 Dimensionless📊 OPERA |
| Molar Volume | 191.367 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.214 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 3.214 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.214 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 7.71 Log10 unitless📊 OPERA |
| Water Solubility | 0.004 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.051 mmHg📊 OPERA |
| Viscosity | 7.794 cP📊 OPERA |
| Surface Tension | 34.302 dyn/cm📊 OPERA |
| Thermal Conductivity | 121.382 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 20.23 Ų💻 Computed |
| H-Bond Donors | 1 count💻 Computed |
| H-Bond Acceptors | 1 count💻 Computed |
| Rotatable Bonds | 1 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 55.087 cm^3/mol📊 OPERA |
| Polarizability | 21.838 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.
