Acetic acid, C8-10-branched alkyl esters, C9-rich (CAS 108419-33-6) — Sweet Middle Note Fragrance Ingredient

ByThe Good Scents
Sweet · Citrus

Acetic acid, C8-10-branched alkyl esters, C9-rich

CAS 108419-33-6

Origin
synthetic
Note
Middle
IFRA
Use with awareness
Data as of: Apr 2026

What Is Acetic acid, C8-10-branched alkyl esters, C9-rich?

Acetic acid, C8-10-branched alkyl esters, C9-rich is a synthetic fragrance ingredient used in industrial and household products. It’s commonly found in air fresheners, cleaning agents, and some personal care items where a clean, slightly fruity scent is desired. This ingredient helps create fresh, slightly sweet aromas in functional products. Its balanced volatility makes it useful for maintaining consistent scent profiles in products designed for gradual fragrance release.

Safety Profile

USE WITH AWARENESS
Generally safeUse with awarenessProfessional use
✓ Approved for use in consumer products
⚠ Potential skin sensitivity at high concentrations
CAS
108419-33-6
Formula
Mixture
MW
Variable
Odor Family
Sweet · Citrus
Layer 1 · Enthusiast

What Does Acetic acid, C8-10-branched alkyl esters, C9-rich Smell Like?

This synthetic ester presents a clean, slightly fruity aroma with subtle citrus undertones. The initial impression is fresh and bright, reminiscent of peeled apples with a hint of pear. As it evolves, a soft, slightly waxy character emerges, like freshly polished wood. The dry-down reveals a faintly sweet, almost candy-like nuance that lingers subtly. The overall effect is unobtrusive yet pleasantly refreshing, making it ideal for functional fragrances where a clean background note is desired without overwhelming the composition.

Scent Profile
Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

This synthetic compound belongs to the class of branched-chain alkyl esters derived from acetic acid. The C9-rich specification indicates a predominance of nonyl (9-carbon) side chains in the mixture. These esters are produced through Fischer esterification between acetic acid and branched C8-10 alcohols. The branching in the alkyl chains affects volatility and odor characteristics compared to their straight-chain counterparts. The ester linkage provides stability while allowing controlled release of the fragrance over time. The specific branching pattern influences both the physical properties and the olfactory profile of the material.

Physical & Chemical Properties

AppearanceColorless to pale yellow liquid
OdorClean, slightly fruity

Perfumer Guide

Note Position
Middle
Volatility
Moderate (2-4 hours)
Blending
Good
ApplicationTypical %RangeNotes
Household Products0.5-2%Up to 5%Provides clean background note
Air Fresheners1-3%Up to 8%Base for fresh compositions
Personal Care0.1-0.5%Up to 1%Used in rinse-off products

Classic Accords

Tip: Use as a bridge between citrus top notes and woody base notes in functional fragrances.

Alternatives & Comparisons

1
Nonyl acetate CAS 143-13-5

Similar clean-fruity character but with more pronounced pear-like notes due to straight-chain structure.

2
2-Ethylhexyl acetate CAS 103-09-3

More citrus-forward ester with higher volatility, suitable for brighter top notes.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

Not currently restricted by IFRA. General ester guidelines apply.

GHS Classification

H315 Skin irritation H319 Eye irritation

RIFM Assessment

No specific RIFM assessment found for this exact mixture. General ester safety data applies.

Sustainability

As a synthetic material, this ester is produced from petrochemical feedstocks. The manufacturing process is energy-intensive but yields consistent quality with minimal batch variation. Unlike some natural alternatives, it doesn’t require agricultural land or compete with food production. The branched structure may affect biodegradability compared to straight-chain esters, though complete environmental impact studies are lacking for this specific mixture.

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References

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

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    Ingredient Data Sheet

    CAS 108419-33-6
    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.

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