8-Ethyl-1,5-dimethylbicyclo[3.2.1]octan-8-ol (CAS 84681-92-5) — Woody Base Note Fragrance Ingredient

ByThe Good Scents
Woody · Balsamic

8-Ethyl-1,5-dimethylbicyclo[3.2.1]octan-8-ol

CAS 84681-92-5

Origin
synthetic
Note
Base
IFRA
Generally safe
Data as of: Apr 2026

What Is 8-Ethyl-1,5-dimethylbicyclo[3.2.1]octan-8-ol?

8-Ethyl-1,5-dimethylbicyclo[3.2.1]octan-8-ol is a synthetic fragrance ingredient used to add woody, earthy notes to perfumes and scented products. It’s found in niche fragrances and some personal care items. This molecule matters because it offers perfumers a unique structural backbone that can enhance complexity and longevity in fragrance compositions.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Limited safety data available
CAS
84681-92-5
Formula
Mixture
MW
Variable
Odor Family
Woody · Balsamic
Layer 1 · Enthusiast

What Does 8-Ethyl-1,5-dimethylbicyclo[3.2.1]octan-8-ol Smell Like?

This synthetic molecule delivers a robust woody character with subtle earthy undertones. The scent evolves from an initial crispness reminiscent of freshly split cedarwood to a warmer, more rounded base note over time. Its dry-down reveals a clean, slightly camphoraceous quality that lingers close to the skin.

Scent Profile
Layer 2

2D Molecular Structure

Bicyclo[3.2.1]octan-8-ol, 8-ethyl-1,5-dimethyl-

SMILES: CCC1(O)C2(C)CCC1(C)CCC2

Chemistry, Properties & Perfumer Guide

The Chemistry

8-Ethyl-1,5-dimethylbicyclo[3.2.1]octan-8-ol belongs to the bicyclic tertiary alcohol class. Its synthesis typically involves cyclization of appropriate precursors followed by functional group transformations. The rigid bicyclic structure contributes to its stability and unique olfactory profile. No natural occurrence has been reported for this compound.

Physical & Chemical Properties

Molecular WeightNot available
Boiling PointNot available

Perfumer Guide

Note Position
Base
Volatility
Low (hours-days)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance1-3%Up to 5%Used as woody base note
Personal Care0.5-1%Up to 2%For subtle woody accents

Classic Accords

Tip: Use in small quantities to avoid overwhelming other notes.

Alternatives & Comparisons

1
Cedrol CAS 77-53-2

Natural alternative with similar woody profile but different longevity.

2
Vertofix CAS 68039-49-6

Synthetic alternative offering more pronounced woody-ambery character.

Layer 3

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.

RIFM Assessment

No RIFM safety assessment currently available for this material.

Sustainability

As a synthetic material, its production avoids natural resource depletion but requires energy-intensive chemical processes. Future developments may focus on greener synthesis routes.

Explore 8-Ethyl-1,5-dimethylbicyclo[3.2.1]octan-8-ol

Browse essential oils and aroma compounds.

Browse on iHerb →

Affiliate disclosure: we may earn a small commission at no extra cost to you.

References

    Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.

    Report a data error

    Ingredient Data Sheet

    CAS 84681-92-5

    Physical Properties

    Molecular Weight182.3 g/mol🔬 PubChem
    LogP (Octanol-Water)3.1🔬 PubChem
    Boiling Point252 °C🔬 EPA CompTox
    Vapor Pressure0.0933 mmHg @ 25°C📊 OPERA
    Flash Point94.7 °C🔬 EPA CompTox
    Involatility Index0.0074💻 Calculated
    log Kp (skin permeability)-1.611💻 Calculated
    SMILESCCC1(C2(CCCC1(CC2)C)C)O🔬 PubChem

    Volatility & Performance

    Fragrance NoteHeart💻 Calculated
    Volatility ClassVery slow💻 Calculated
    Persistence Score1.9 / 5💻 Calculated

    Odor & Flavor

    Primary Descriptorsearthywoody• leffingwell
    Functional Groupsalcohol💻 RDKit
    Data Sources & Attribution
    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: DTXSID80868827

    Physical Properties

    Molecular Weight 182.307 g/mol🔬 EPA CompTox
    Density 0.959 g/cm^3📊 OPERA
    Boiling Point 244.355 °C📊 OPERA
    Melting Point 93.783 °C📊 OPERA
    Flash Point 94.232 °C📊 OPERA
    Refractive Index 1.505 Dimensionless📊 OPERA
    Molar Volume 185.441 cm^3/mol📊 OPERA

    Partition & Solubility

    LogP (Octanol-Water) 3.096 Log10 unitless📊 OPERA
    LogD (pH 5.5) 3.096 Log10 unitless📊 OPERA
    LogD (pH 7.4) 3.096 Log10 unitless📊 OPERA
    LogKoa (Octanol-Air) 7.75 Log10 unitless📊 OPERA
    Water Solubility 0.003 mol/L📊 OPERA
    Henry's Law Constant 0 atm-m3/mole📊 OPERA

    Transport Properties

    Vapor Pressure 0.05 mmHg📊 OPERA
    Viscosity 24.254 cP📊 OPERA
    Surface Tension 37.243 dyn/cm📊 OPERA
    Thermal Conductivity 126.572 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 54.987 cm^3/mol📊 OPERA
    Polarizability 21.798 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.

    Similar Posts