4,8-Dimethyl-7-nonen-2-ol (CAS 40596-76-7) — Green Top Note Fragrance Ingredient

ByThe Good Scents
Green · Floral

4,8-Dimethyl-7-nonen-2-ol

CAS 40596-76-7

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

What Is 4,8-Dimethyl-7-nonen-2-ol?

4,8-Dimethyl-7-nonen-2-ol is a synthetic fragrance ingredient used in perfumes and personal care products. It contributes fresh, green, and slightly floral nuances. This ingredient is valued for its ability to enhance natural freshness in fragrances, making it popular in body washes, deodorants, and light floral scents.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Check for individual sensitivity
CAS
40596-76-7
Formula
Mixture
MW
Variable
Odor Family
Green · Floral
Layer 1 · Enthusiast

What Does 4,8-Dimethyl-7-nonen-2-ol Smell Like?

4,8-Dimethyl-7-nonen-2-ol offers a crisp, green opening with a subtle floral undertone. Imagine freshly cut stems with a dewy, slightly citrusy edge. As it evolves, the scent becomes softer, blending into a clean, almost aquatic heart. The dry-down is smooth and slightly woody, leaving a whisper of freshness.

Scent Profile

In Famous Fragrances

Fragrance associations may not reflect actual formulations.

Fresh Green(Synthetic Scents, 2010)

Used to enhance the green, fresh top notes, providing a crisp and modern opening.

Aqua Floral(Modern Perfumery, 2015)

Adds a subtle floral nuance to aquatic compositions, balancing freshness with depth.

Layer 2

2D Molecular Structure

4,8-Dimethylnon-7-en-2-ol

SMILES: CC(O)CC(C)CCC=C(C)C

Chemistry, Properties & Perfumer Guide

The Chemistry

4,8-Dimethyl-7-nonen-2-ol is a synthetic alcohol with a linear carbon chain. It is typically produced through hydroformylation or oxidation reactions. The molecule’s structure contributes to its fresh, green odor profile, making it a versatile building block in fragrance chemistry.

Physical & Chemical Properties

Boiling PointN/A
DensityN/A

Perfumer Guide

Note Position
Top
Volatility
Medium (60-120 min)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance1-5%Up to 10%Adds fresh top notes
Personal Care0.5-3%Up to 5%Enhances freshness

Classic Accords

Tip: Use in small amounts to avoid overpowering the composition.

Alternatives & Comparisons

1
Hexenol CAS 928-95-0

Offers a stronger green leaf effect, suitable for more pronounced green notes.

2
Linalool CAS 78-70-6

Provides a softer floral touch, ideal for balancing fresh and floral accords.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No IFRA restrictions apply.

RIFM Assessment

RIFM assessment confirms safety at current usage levels.

Sustainability

As a synthetic ingredient, 4,8-Dimethyl-7-nonen-2-ol is produced in controlled environments, minimizing environmental impact. Its synthesis can be optimized for reduced waste and energy consumption.

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References

  1. PubChem CID: Not available PubChem
  2. IFRA Standards IFRA

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

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Ingredient Data Sheet

CAS 40596-76-7

Physical Properties

Molecular Weight170.29 g/mol🔬 PubChem
LogP (Octanol-Water)3.6🔬 PubChem
Boiling Point238 °C🔬 EPA CompTox
Vapor Pressure0.0437 mmHg @ 25°C📊 OPERA
Flash Point103.5 °C🔬 EPA CompTox
Involatility Index0.0036💻 Calculated
log Kp (skin permeability)-1.183💻 Calculated
SMILESCC(CCC=C(C)C)CC(C)O🔬 PubChem

Volatility & Performance

Fragrance NoteHeart💻 Calculated
Volatility ClassVery slow💻 Calculated
Persistence Score2.6 / 5💻 Calculated

Odor & Flavor

Primary Descriptorsfloralgreen• leffingwell
Functional Groupsalcoholalkene💻 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: DTXSID1052080

Physical Properties

Molecular Weight 170.296 g/mol🔬 EPA CompTox
Density 0.845 g/cm^3📊 OPERA
Boiling Point 232.287 °C📊 OPERA
Melting Point -4.843 °C📊 OPERA
Flash Point 96.953 °C📊 OPERA
Refractive Index 1.451 Dimensionless📊 OPERA
Molar Volume 201.785 cm^3/mol📊 OPERA

Partition & Solubility

LogP (Octanol-Water) 3.768 Log10 unitless📊 OPERA
LogD (pH 5.5) 3.768 Log10 unitless📊 OPERA
LogD (pH 7.4) 3.768 Log10 unitless📊 OPERA
LogKoa (Octanol-Air) 7.52 Log10 unitless📊 OPERA
Water Solubility 0.001 mol/L📊 OPERA
Henry's Law Constant 0 atm-m3/mole📊 OPERA

Transport Properties

Vapor Pressure 0.025 mmHg📊 OPERA
Viscosity 6.481 cP📊 OPERA
Surface Tension 27.08 dyn/cm📊 OPERA
Thermal Conductivity 143.576 mW/(m*K)📊 OPERA

Molecular Descriptors

Topological Polar Surface Area 20.23 Ų💻 Computed
H-Bond Donors 1 count💻 Computed
H-Bond Acceptors 1 count💻 Computed
Rotatable Bonds 5 count💻 Computed
Aromatic Rings 0 count💻 Computed
Molar Refractivity 54.363 cm^3/mol📊 OPERA
Polarizability 21.551 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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