9-Decen-2-one (CAS 35194-30-0) — Citrus Top Note Fragrance Ingredient

ByThe Good Scents
Citrus · Woody

9-Decen-2-one

CAS 35194-30-0

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

What Is 9-Decen-2-one?

9-Decen-2-one is a synthetic fragrance molecule known for its fresh, citrusy, and slightly woody aroma. It’s often used in perfumes, soaps, and detergents to add a clean, uplifting note. This ingredient matters because it provides a cost-effective alternative to natural citrus oils while offering better stability and longevity in formulations.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Check for skin sensitivity
CAS
35194-30-0
Formula
Mixture
MW
Variable
Odor Family
Citrus · Woody
Layer 1 · Enthusiast

What Does 9-Decen-2-one Smell Like?

9-Decen-2-one opens with a bright, citrusy burst reminiscent of freshly peeled grapefruit, quickly transitioning into a green, slightly woody heart. The dry-down reveals a subtle, clean muskiness, making it versatile for fresh and woody accords. Its evolution is linear yet nuanced, providing a crisp, modern edge to fragrances.

Scent Profile
Layer 2

2D Molecular Structure

9-Decen-2-one

SMILES: CC(=O)CCCCCCC=C

Chemistry, Properties & Perfumer Guide

The Chemistry

9-Decen-2-one is a ketone with a ten-carbon chain and a double bond at the ninth position. It is synthesized through the oxidation of corresponding alcohols or via Grignard reactions. Its structure allows for both citrusy and woody olfactory characteristics, making it a versatile building block in perfumery.

Physical & Chemical Properties

Boiling PointNot available
DensityNot available

Perfumer Guide

Note Position
Top
Volatility
Medium (1-2 hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance1-5%Up to 10%Adds fresh top notes
Functional Fragrance0.5-3%Up to 5%Enhances clean scents

Classic Accords

Tip: Use in citrusy or woody accords to add a modern, clean edge.

Alternatives & Comparisons

1
Citral CAS 5392-40-5

More intense citrus note, but less stable in formulations.

2
Linalool CAS 78-70-6

Softer floral-citrus note, better for delicate blends.

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

RIFM assessment pending. Preliminary data suggests low toxicity.

Sustainability

As a synthetic molecule, 9-Decen-2-one offers consistent quality and reduces reliance on natural resources. Its production can be optimized for low environmental impact, though energy use in synthesis should be considered.

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References

  1. PubChem Compound Summary for 9-Decen-2-one PubChem

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

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Ingredient Data Sheet

CAS 35194-30-0

Physical Properties

Molecular Weight154.25 g/mol🔬 PubChem
LogP (Octanol-Water)2.9🔬 PubChem
Boiling Point206 °C🔬 EPA CompTox
Vapor Pressure0.1778 mmHg @ 25°C📊 OPERA
Flash Point81.1 °C🔬 EPA CompTox
Involatility Index0.0154💻 Calculated
log Kp (skin permeability)-1.582💻 Calculated
SMILESCC(=O)CCCCCCC=C🔬 PubChem

Volatility & Performance

Fragrance NoteHeart💻 Calculated
Volatility ClassSlow💻 Calculated
Persistence Score1.3 / 5💻 Calculated

Odor & Flavor

Primary Descriptorsapplefattyfruitygreenpearpineapple• leffingwell
Functional Groupsketonealkene💻 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: DTXSID70188687

Physical Properties

Molecular Weight 154.253 g/mol🔬 EPA CompTox
Density 0.844 g/cm^3🔬 EPA CTX
Boiling Point 216.132 °C📊 OPERA
Melting Point 6.032 °C📊 OPERA
Flash Point 75.957 °C📊 OPERA
Refractive Index 1.431 Dimensionless📊 OPERA
Molar Volume 185.816 cm^3/mol📊 OPERA

Partition & Solubility

LogP (Octanol-Water) 3.112 Log10 unitless📊 OPERA
LogD (pH 5.5) 3.112 Log10 unitless📊 OPERA
LogD (pH 7.4) 3.112 Log10 unitless📊 OPERA
LogKoa (Octanol-Air) 5 Log10 unitless📊 OPERA
Water Solubility 0.005 mol/L📊 OPERA
Henry's Law Constant 0 atm-m3/mole📊 OPERA

Transport Properties

Vapor Pressure 0.108 mmHg📊 OPERA
Viscosity 1.265 cP📊 OPERA
Surface Tension 27.574 dyn/cm📊 OPERA
Thermal Conductivity 141.355 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 7 count💻 Computed
Aromatic Rings 0 count💻 Computed
Molar Refractivity 48.133 cm^3/mol📊 OPERA
Polarizability 19.081 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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