3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl propionate (CAS 67634-24-6) — Woody Heart to base Note Fragrance Ingredient

ByThe Good Scents
Woody · Balsamic

3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl propionate

CAS 67634-24-6

Origin
synthetic
Note
Heart to base
IFRA
Generally safe
Data as of: Apr 2026

What Is 3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl propionate?

3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl propionate is a synthetic fragrance ingredient used in perfumery. It is found in various personal care products and fine fragrances. This compound contributes to complex scent profiles, often adding depth and longevity to fragrance compositions.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Check for skin sensitivity
CAS
67634-24-6
Formula
Mixture
MW
Variable
Odor Family
Woody · Balsamic
Layer 1 · Enthusiast

What Does 3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl propionate Smell Like?

This synthetic ingredient offers a complex olfactory profile with woody, balsamic undertones. It evolves from a fresh, slightly green top note to a warm, resinous heart, finishing with a long-lasting, slightly musky dry-down. The scent is reminiscent of aged woods with a hint of amber-like sweetness.

Scent Profile
Layer 2

2D Molecular Structure

3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl propionate

SMILES: CCC(=O)OC1CC2CC1C1C=CCC21

Chemistry, Properties & Perfumer Guide

The Chemistry

3a,4,5,6,7,7a-Hexahydro-4,7-methano-1H-inden-5-yl propionate is a synthetic ester derived from a hydrogenated indene structure. It is typically produced through esterification reactions involving propionic acid and hydrogenated indenol derivatives. The compound’s bicyclic structure contributes to its stability and longevity in fragrance applications.

Physical & Chemical Properties

Perfumer Guide

Note Position
Heart to base
Volatility
Medium (2-4 hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance1-3%Up to 5%Adds woody depth
Personal Care0.5-2%Up to 3%Long-lasting note

Classic Accords

Tip: Use in small quantities to enhance woody accords without overpowering other notes.

Alternatives & Comparisons

1
Cedryl acetate CAS 77-54-3

Offers similar woody characteristics with slightly more cedar-like tones.

2
Vertofix CAS 68039-49-6

Provides comparable woody-amber notes with excellent tenacity.

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

Not currently assessed by RIFM.

Sustainability

As a synthetic material, this compound is produced through controlled chemical processes with consistent quality. Its production avoids natural resource depletion, though energy inputs for synthesis should be considered. The material’s stability contributes to fragrance longevity, potentially reducing overall product usage.

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References

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

    Report a data error

    Ingredient Data Sheet

    CAS 67634-24-6

    Physical Properties

    Molecular Weight206.28 g/mol🔬 PubChem
    LogP (Octanol-Water)2.6🔬 PubChem
    Boiling Point268 °C🔬 EPA CompTox
    Vapor Pressure0 mmHg @ 25°C📊 OPERA
    Flash Point112.9 °C🔬 EPA CompTox
    log Kp (skin permeability)-2.112💻 Calculated
    SMILESCCC(=O)OC1CC2CC1C3C2CC=C3🔬 PubChem

    Volatility & Performance

    Fragrance NoteBase💻 Calculated
    Volatility ClassVery slow💻 Calculated
    Persistence Score8.1 / 5💻 Calculated

    Odor & Flavor

    Functional Groupsesteretheralkene💻 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: DTXSID2052362

    Physical Properties

    Molecular Weight 206.285 g/mol🔬 EPA CompTox
    Density 1.099 g/cm^3📊 OPERA
    Boiling Point 270.846 °C📊 OPERA
    Melting Point 74.962 °C📊 OPERA
    Flash Point 122.196 °C📊 OPERA
    Refractive Index 1.531 Dimensionless📊 OPERA
    Molar Volume 186.659 cm^3/mol📊 OPERA

    Partition & Solubility

    LogP (Octanol-Water) 3.014 Log10 unitless📊 OPERA
    LogD (pH 5.5) 3.014 Log10 unitless📊 OPERA
    LogD (pH 7.4) 3.014 Log10 unitless📊 OPERA
    LogKoa (Octanol-Air) 6.66 Log10 unitless📊 OPERA
    Water Solubility 0.002 mol/L📊 OPERA
    Henry's Law Constant 0 atm-m3/mole📊 OPERA

    Transport Properties

    Vapor Pressure 0.002 mmHg📊 OPERA
    Viscosity 8.625 cP📊 OPERA
    Surface Tension 36.492 dyn/cm📊 OPERA
    Thermal Conductivity 116.813 mW/(m*K)📊 OPERA

    Molecular Descriptors

    Topological Polar Surface Area 26.3 Ų💻 Computed
    H-Bond Donors 0 count💻 Computed
    H-Bond Acceptors 2 count💻 Computed
    Rotatable Bonds 2 count💻 Computed
    Aromatic Rings 0 count💻 Computed
    Molar Refractivity 57.766 cm^3/mol📊 OPERA
    Polarizability 22.9 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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