4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)- (CAS 1449104-34-0) — Green Top to middle Note Fragrance Ingredient

ByThe Good Scents
Green · Woody

4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)-

CAS 1449104-34-0

Origin
synthetic
Note
Top to middle
IFRA
Use with awareness
Data as of: Apr 2026

What Is 4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)-?

4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)- is a synthetic fragrance ingredient primarily used in niche perfumery. It is not commonly encountered in everyday products but may appear in high-end fragrances. This molecule contributes unique olfactory characteristics that are valued by perfumers for creating distinctive scent profiles.

Safety Profile

USE WITH AWARENESS
Generally safeUse with awarenessProfessional use
⚠ Limited safety data available
⚠ Use in regulated concentrations
CAS
1449104-34-0
Formula
Mixture
MW
Variable
Odor Family
Green · Woody
Layer 1 · Enthusiast

What Does 4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)- Smell Like?

4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)- offers a complex olfactory profile with green, slightly woody, and aldehydic nuances. The initial impression is sharp and fresh, evolving into a more rounded, slightly floral heart. The dry-down reveals a subtle balsamic character with lingering woody undertones. Its unique structure provides a modern twist on classic aldehydic notes.

Scent Profile
Layer 2

2D Molecular Structure

4-​Pentenal, 5-​cyclohexyl-​2,​4-​dimethyl-​, (4E)​-

SMILES: CC(C\C(C)=C\C1CCCCC1)C=O

Chemistry, Properties & Perfumer Guide

The Chemistry

4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)- is a synthetic aldehyde with a complex structure featuring a cyclohexyl group and dimethyl substitution. Its synthesis typically involves multi-step organic reactions, including aldol condensation and selective hydrogenation. The (4E)- configuration contributes to its specific olfactory characteristics. As a relatively new compound in perfumery, its full potential is still being explored by fragrance chemists.

Physical & Chemical Properties

Boiling PointNot available
DensityNot available

Perfumer Guide

Note Position
Top to middle
Volatility
Moderate (1-2 hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance0.1-0.5%Up to 1%Used as a modifier
Functional Fragrance0.05-0.2%Up to 0.5%Limited use

Classic Accords

Tip: Use sparingly to add complexity to green or woody accords.

Alternatives & Comparisons

1
Cyclamen aldehyde CAS 103-95-7

Offers similar floral-aldehydic character with better safety profile.

2
Hexyl cinnamaldehyde CAS 101-86-0

Provides floral-jasminic notes with good stability.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No specific IFRA restrictions currently listed.

RIFM Assessment

No RIFM assessment currently available for this compound.

Sustainability

As a synthetic molecule, 4-Pentenal, 5-cyclohexyl-2,4-dimethyl-, (4E)- is produced through controlled chemical processes. Its environmental impact depends on manufacturing practices and waste management. Being a relatively new compound, its biodegradability and ecotoxicity profile are not fully characterized.

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References

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

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    Ingredient Data Sheet

    CAS 1449104-34-0

    Physical Properties

    Molecular Weight194.31 g/mol🔬 PubChem
    LogP (Octanol-Water)4.4🔬 PubChem
    Boiling Point261.9 °C🔬 EPA CompTox
    Vapor Pressure0.0056 mmHg @ 25°C📊 OPERA
    Flash Point115.9 °C🔬 EPA CompTox
    Involatility Index0.0004💻 Calculated
    log Kp (skin permeability)-0.761💻 Calculated
    SMILESCC(CC(=CC1CCCCC1)C)C=O🔬 PubChem

    Volatility & Performance

    Fragrance NoteHeart💻 Calculated
    Volatility ClassVery slow💻 Calculated
    Persistence Score5 / 5💻 Calculated

    Odor & Flavor

    Primary Descriptorsgreenwoody• leffingwell
    Functional Groupsaldehydealkene💻 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: DTXSID201021053

    Physical Properties

    Molecular Weight 194.318 g/mol🔬 EPA CompTox
    Density 0.905 g/cm^3🔬 EPA CTX
    Boiling Point 261.85 °C🔬 EPA CTX
    Melting Point 5.049 °C📊 OPERA
    Flash Point 115.9 °C🔬 EPA CTX
    Refractive Index 1.514 Dimensionless📊 OPERA
    Molar Volume 205.864 cm^3/mol📊 OPERA

    Partition & Solubility

    LogP (Octanol-Water) 4.38 Log10 unitless🔬 EPA CTX
    LogD (pH 5.5) 4.255 Log10 unitless📊 OPERA
    LogD (pH 7.4) 4.255 Log10 unitless📊 OPERA
    LogKoa (Octanol-Air) 6.67 Log10 unitless📊 OPERA
    Water Solubility 0 mol/L📊 OPERA
    Henry's Law Constant 0 atm-m3/mole📊 OPERA

    Transport Properties

    Vapor Pressure 0.007 mmHg🔬 EPA CTX
    Viscosity 4.995 cP📊 OPERA
    Surface Tension 30.876 dyn/cm📊 OPERA
    Thermal Conductivity 133.329 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 4 count💻 Computed
    Aromatic Rings 0 count💻 Computed
    Molar Refractivity 61.936 cm^3/mol📊 OPERA
    Polarizability 24.553 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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