1,2,3,4,5,6,7,8-Octahydro-5,5-dimethylnaphthalene-2-carbaldehyde (CAS 68991-96-8) — Woody Base Note Fragrance Ingredient

ByThe Good Scents
Woody · Balsamic

1,2,3,4,5,6,7,8-Octahydro-5,5-dimethylnaphthalene-2-carbaldehyde

CAS 68991-96-8

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

What Is 1,2,3,4,5,6,7,8-Octahydro-5,5-dimethylnaphthalene-2-carbaldehyde?

1,2,3,4,5,6,7,8-Octahydro-5,5-dimethylnaphthalene-2-carbaldehyde is a synthetic fragrance ingredient used in perfumery. It contributes to complex woody and amber accords. This ingredient matters because it adds depth and longevity to fragrances, often used as a base note to enhance other materials.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Check for skin sensitivity
CAS
68991-96-8
Formula
Mixture
MW
Variable
Odor Family
Woody · Balsamic
Layer 1 · Enthusiast

What Does 1,2,3,4,5,6,7,8-Octahydro-5,5-dimethylnaphthalene-2-carbaldehyde Smell Like?

This synthetic aldehyde offers a rich, woody aroma with subtle amber undertones. Initially, it presents a sharp, almost metallic edge that quickly mellows into a warm, slightly sweet base. Over time, it evolves into a deep, resinous character that lingers on the skin, making it ideal for anchoring fragrances.

Scent Profile
Layer 2

2D Molecular Structure

2-Naphthalenecarboxaldehyde, 1,2,3,4,5,6,7,8-octahydro-5,5-dimethyl-

SMILES: CC1(C)CCCC2=C1CCC(C2)C=O

Chemistry, Properties & Perfumer Guide

The Chemistry

1,2,3,4,5,6,7,8-Octahydro-5,5-dimethylnaphthalene-2-carbaldehyde is a synthetic aldehyde with a complex bicyclic structure. It is typically synthesized through catalytic hydrogenation of naphthalene derivatives followed by oxidation. The molecule’s rigidity and functional group placement contribute to its unique olfactory profile.

Physical & Chemical Properties

Boiling PointN/A
DensityN/A

Perfumer Guide

Note Position
Base
Volatility
Low (hours-days)
Blending
Excellent
ApplicationTypical %RangeNotes
Fine Fragrance1-3%Up to 5%Adds depth and longevity
Home Fragrance0.5-2%Up to 3%Enhances woody accords

Classic Accords

Tip: Use sparingly to avoid overpowering other notes.

Alternatives & Comparisons

1
Ambroxan CAS 6790-58-5

A more widely used amber alternative with similar longevity but less woody 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.

RIFM Assessment

No RIFM safety assessment available.

Sustainability

As a synthetic ingredient, it is produced in controlled environments with minimal environmental impact. Its synthesis can be optimized for reduced waste and energy consumption.

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References

  1. PubChem Compound Summary for CID N/A PubChem

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

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Ingredient Data Sheet

CAS 68991-96-8

Physical Properties

Molecular Weight192.3 g/mol🔬 PubChem
LogP (Octanol-Water)2.6🔬 PubChem
Boiling Point241 °C🔬 EPA CompTox
Vapor Pressure0.049 mmHg @ 25°C📊 OPERA
Flash Point97.8 °C🔬 EPA CompTox
Involatility Index0.0038💻 Calculated
log Kp (skin permeability)-2.027💻 Calculated
SMILESCC1(CCCC2=C1CCC(C2)C=O)C🔬 PubChem

Volatility & Performance

Fragrance NoteHeart💻 Calculated
Volatility ClassVery slow💻 Calculated
Persistence Score2.3 / 5💻 Calculated

Odor & Flavor

Functional Groupsaldehydealkene💻 RDKit

Regulatory Status

IFRA ListedYes — see IFRA Standards for category limits⚖️ IFRA 51
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: DTXSID80867794

Physical Properties

Molecular Weight 192.302 g/mol🔬 EPA CompTox
Density 0.975 g/cm^3📊 OPERA
Boiling Point 261.523 °C📊 OPERA
Melting Point 33.431 °C📊 OPERA
Flash Point 99.456 °C📊 OPERA
Refractive Index 1.5 Dimensionless📊 OPERA
Molar Volume 197.023 cm^3/mol📊 OPERA

Partition & Solubility

LogP (Octanol-Water) 3.919 Log10 unitless📊 OPERA
LogD (pH 5.5) 3.919 Log10 unitless📊 OPERA
LogD (pH 7.4) 3.919 Log10 unitless📊 OPERA
LogKoa (Octanol-Air) 6.32 Log10 unitless📊 OPERA
Water Solubility 0 mol/L📊 OPERA
Henry's Law Constant 0.001 atm-m3/mole📊 OPERA

Transport Properties

Vapor Pressure 0.019 mmHg📊 OPERA
Viscosity 6.016 cP📊 OPERA
Surface Tension 32.649 dyn/cm📊 OPERA
Thermal Conductivity 125.201 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 57.935 cm^3/mol📊 OPERA
Polarizability 22.967 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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