1,6-Octadien-3-ol, 3,7-dimethyl-, acid-isomerized (CAS 73018-51-6) — Citrus Top to Heart Note Fragrance Ingredient

ByThe Good Scents
Citrus · Floral

1,6-Octadien-3-ol, 3,7-dimethyl-, acid-isomerized

CAS 73018-51-6

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

What Is 1,6-Octadien-3-ol, 3,7-dimethyl-, acid-isomerized?

1,6-Octadien-3-ol, 3,7-dimethyl-, acid-isomerized is a synthetic fragrance ingredient used to enhance floral and citrus notes in perfumes. It’s commonly found in air fresheners and personal care products. This molecule matters because it contributes to the longevity and complexity of fragrances, acting as a bridge between top and heart notes.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ Safe in regulated products
⚠ Check for potential allergens
CAS
73018-51-6
Formula
Mixture
MW
Variable
Odor Family
Citrus · Floral
Layer 1 · Enthusiast

What Does 1,6-Octadien-3-ol, 3,7-dimethyl-, acid-isomerized Smell Like?

This synthetic molecule offers a fresh, slightly floral aroma with a citrusy undertone. It evolves from a bright, initial burst to a smoother, more rounded heart note. The dry-down reveals a subtle woody character, making it versatile in various fragrance compositions.

Scent Profile
Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

1,6-Octadien-3-ol, 3,7-dimethyl-, acid-isomerized is a synthetic terpene alcohol. It is produced through acid-catalyzed isomerization of linalool, resulting in a mixture of isomers. This process enhances its stability and olfactory properties, making it a valuable ingredient in modern perfumery.

Physical & Chemical Properties

Boiling Point198 °C
Density0.865 g/cm³

Perfumer Guide

Note Position
Top to Heart
Volatility
Medium (1-4 hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance3-8%Up to 15%Versatile top note modifier
Personal Care1-5%Up to 10%Adds freshness
Air Fresheners5-10%Up to 20%Enhances longevity

Classic Accords

Tip: Use in combination with citrus oils to enhance freshness.

Alternatives & Comparisons

1
Linalool CAS 78-70-6

A natural alternative with similar floral and citrus notes.

2
Linalyl acetate CAS 115-95-7

Provides a more pronounced floral character.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

Not restricted by IFRA.

EU Allergen Declaration

Not listed as an EU allergen.

RIFM Assessment

No specific RIFM safety assessment found.

Sustainability

As a synthetic ingredient, its production is controlled and consistent, reducing environmental impact compared to some natural alternatives. However, energy use in synthesis should be considered.

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References

  1. PubChem PubChem

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

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