4,7-Methano-1H-inden-5-ol, octahydro-3,4,5-trimethyl- (CAS 1340502-69-3) — Woody Base Note Fragrance Ingredient

ByThe Good Scents
Woody · Balsamic

4,7-Methano-1H-inden-5-ol, octahydro-3,4,5-trimethyl-

CAS 1340502-69-3

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

What Is 4,7-Methano-1H-inden-5-ol, octahydro-3,4,5-trimethyl-?

4,7-Methano-1H-inden-5-ol, octahydro-3,4,5-trimethyl- is a synthetic fragrance ingredient used in modern perfumery to add woody, earthy nuances. It’s found in niche fragrances seeking complex, long-lasting base notes. This molecule matters because it can mimic rare natural aromas while offering superior stability and consistency in formulations.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated concentrations
⚠ Limited safety data – use standard precautions
CAS
1340502-69-3
Formula
Mixture
MW
Variable
Odor Family
Woody · Balsamic
Layer 1 · Enthusiast

What Does 4,7-Methano-1H-inden-5-ol, octahydro-3,4,5-trimethyl- Smell Like?

A dense, woody-ambergris character with subtle animalic warmth. Imagine damp forest soil under cedar trees after rain, transitioning to a smooth leather-like dryness. The initial sharpness gives way to a persistent mineralic quality resembling sun-warmed stones. In drydown, reveals faintly sweet tobacco nuances wrapped in an earthy musk cocoon.

Scent Profile
Layer 2

2D Molecular Structure

4,7-Methano-1H-inden-5-ol, octahydro-3,4,5-trimethyl-

SMILES: CC1CCC2C3CC(C)(O)C(C)(C3)C12

Chemistry, Properties & Perfumer Guide

The Chemistry

A synthetic tricyclic alcohol derived from camphor-like structures. Its rigid methanoindenol framework creates exceptional tenacity. Typical synthesis involves Diels-Alder reactions followed by hydrogenation and methylation steps. The three methyl groups introduce steric hindrance that slows evaporation while enhancing woody olfactory characteristics.

Physical & Chemical Properties

Perfumer Guide

Note Position
Base
Volatility
Very low (24+ hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance0.5-2%Up to 5%For woody-ambergris effects
Functional Fragrance0.1-0.5%Up to 1%Background fixative

Classic Accords

Tip: Use with ionones to soften woody sharpness; combines well with synthetic musks for diffusion.

Alternatives & Comparisons

1
Trimethylcyclohexanol CAS 933-48-2

For brighter wood notes with less animalic depth

2
Iso E Super CAS 54464-57-2

When seeking more transparent woody effects with better diffusion

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

General reference only. Consult current IFRA Standards Library before formulating.

IFRA Status

Not currently restricted by IFRA. Monitor for future amendments.

RIFM Assessment

Under review by RIFM. Preliminary data suggests standard usage levels are safe.

Sustainability

Synthetic production avoids natural resource depletion. Manufacturing requires petrochemical feedstocks but at smaller scale than commodity chemicals. No known ecological accumulation concerns at current usage levels.

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References

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

    Report a data error

    Physicochemical Properties

    DTXSID: DTXSID20889293

    Physical Properties

    Molecular Weight 194.318 g/mol🔬 EPA CompTox
    Density 1.016 g/cm^3📊 OPERA
    Boiling Point 265.297 °C📊 OPERA
    Melting Point 95.382 °C📊 OPERA
    Flash Point 116.152 °C📊 OPERA
    Refractive Index 1.521 Dimensionless📊 OPERA
    Molar Volume 189.599 cm^3/mol📊 OPERA

    Partition & Solubility

    LogP (Octanol-Water) 3.367 Log10 unitless📊 OPERA
    LogD (pH 5.5) 3.367 Log10 unitless📊 OPERA
    LogD (pH 7.4) 3.367 Log10 unitless📊 OPERA
    LogKoa (Octanol-Air) 8.46 Log10 unitless📊 OPERA
    Water Solubility 0.003 mol/L📊 OPERA
    Henry's Law Constant 0 atm-m3/mole📊 OPERA

    Transport Properties

    Vapor Pressure 0.004 mmHg📊 OPERA
    Surface Tension 36.253 dyn/cm📊 OPERA
    Thermal Conductivity 114.21 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 0 count💻 Computed
    Aromatic Rings 0 count💻 Computed
    Molar Refractivity 57.743 cm^3/mol📊 OPERA
    Polarizability 22.891 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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