1-Ethoxy 1-decene (CAS 61668-40-4) — Citrus Top Note Fragrance Ingredient

ByThe Good Scents
Citrus · Green

1-Ethoxy 1-decene

CAS 61668-40-4

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

What Is 1-Ethoxy 1-decene?

1-Ethoxy 1-decene is a synthetic fragrance ingredient used to create fresh, green, and slightly fruity top notes in perfumes. It’s commonly found in modern citrus and aquatic fragrances. This molecule helps perfumers achieve crisp openings that transition smoothly into heart notes, making it valuable for creating dynamic scent experiences.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Check for skin sensitivity
CAS
61668-40-4
Formula
Mixture
MW
Variable
Odor Family
Citrus · Green
Layer 1 · Enthusiast

What Does 1-Ethoxy 1-decene Smell Like?

1-Ethoxy 1-decene opens with a burst of fresh greenness reminiscent of crushed stems, evolving into a subtle fruity nuance like underripe pear. The dry-down reveals a clean, slightly waxy character that blends seamlessly with citrus and floral notes. Its transparency makes it ideal for modern compositions where clarity is key.

Scent Profile
Layer 2

2D Molecular Structure

1-Decene, 1-ethoxy-

SMILES: CCCCCCCCC=COCC

Chemistry, Properties & Perfumer Guide

The Chemistry

1-Ethoxy 1-decene is an ether derivative of decene, synthesized through the Williamson ether synthesis. Its structure combines a long hydrocarbon chain with an ethoxy group, creating a molecule with both hydrophobic and slightly polar characteristics. This balance contributes to its unique volatility and scent profile.

Physical & Chemical Properties

Perfumer Guide

Note Position
Top
Volatility
High (30-90 min)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance1-5%Up to 10%Fresh top note
Functional Fragrances0.5-2%Up to 5%Clean scent modifier

Classic Accords

Tip: Use with citrus oils to enhance freshness without overpowering.

Alternatives & Comparisons

1
1-Octen-3-ol CAS 3391-86-4

When more mushroom-like earthiness is desired.

2
cis-3-Hexenol CAS 928-96-1

For a greener, grassier alternative.

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 specific RIFM assessment found.

Sustainability

As a synthetic material, 1-Ethoxy 1-decene is produced through controlled chemical processes with minimal environmental impact. Its efficiency in formulations reduces the need for higher concentrations of natural materials.

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References

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

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    Ingredient Data Sheet

    CAS 61668-40-4

    Physical Properties

    Molecular Weight184.32 g/mol🔬 PubChem
    LogP (Octanol-Water)5.1🔬 PubChem
    Boiling Point220.8 °C🔬 EPA CompTox
    Vapor Pressure0.0577 mmHg @ 25°C📊 OPERA
    Flash Point91.1 °C🔬 EPA CompTox
    Involatility Index0.0046💻 Calculated
    log Kp (skin permeability)-0.203💻 Calculated
    SMILESCCCCCCCCC=COCC🔬 PubChem

    Volatility & Performance

    Fragrance NoteHeart💻 Calculated
    Volatility ClassVery slow💻 Calculated
    Persistence Score2.9 / 5💻 Calculated

    Odor & Flavor

    Functional Groupsetheralkene💻 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: DTXSID10886453

    Physical Properties

    Molecular Weight 184.323 g/mol🔬 EPA CompTox
    Density 0.811 g/cm^3🔬 EPA CTX
    Boiling Point 220.85 °C🔬 EPA CTX
    Melting Point -29.361 °C📊 OPERA
    Flash Point 91.098 °C🔬 EPA CTX
    Refractive Index 1.438 Dimensionless📊 OPERA
    Molar Volume 226.594 cm^3/mol📊 OPERA

    Partition & Solubility

    LogP (Octanol-Water) 5.352 Log10 unitless📊 OPERA
    LogD (pH 5.5) 5.352 Log10 unitless📊 OPERA
    LogD (pH 7.4) 5.352 Log10 unitless📊 OPERA
    LogKoa (Octanol-Air) 5.71 Log10 unitless📊 OPERA
    Water Solubility 0.001 mol/L📊 OPERA
    Henry's Law Constant 0.001 atm-m3/mole📊 OPERA

    Transport Properties

    Vapor Pressure 0.058 mmHg🔬 EPA CTX
    Viscosity 2.271 cP📊 OPERA
    Surface Tension 25.784 dyn/cm📊 OPERA
    Thermal Conductivity 135.841 mW/(m*K)📊 OPERA

    Molecular Descriptors

    Topological Polar Surface Area 9.23 Ų💻 Computed
    H-Bond Donors 0 count💻 Computed
    H-Bond Acceptors 1 count💻 Computed
    Rotatable Bonds 9 count💻 Computed
    Aromatic Rings 0 count💻 Computed
    Molar Refractivity 59.446 cm^3/mol📊 OPERA
    Polarizability 23.566 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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