Hexanal, 6-(2,4,4-trimethylcyclopentylidene)-, (6E)- (CAS 1429808-42-3) — Green Top Note Fragrance Ingredient

ByThe Good Scents
Green · Woody

Hexanal, 6-_(2,_4,_4-_trimethylcyclopentyl_idene)_-_, (6E)_-

CAS 1429808-42-3

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

What Is Hexanal, 6-_(2,_4,_4-_trimethylcyclopentyl_idene)_-_, (6E)_-?

Hexanal, 6-_(2,_4,_4-_trimethylcyclopentyl_idene)_-_, (6E)_- is a synthetic fragrance ingredient used in modern perfumery. It contributes fresh, green, and slightly woody nuances to compositions. This molecule is typically found in contemporary fragrances aiming for crisp, naturalistic effects.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ No major safety concerns reported
⚠ Limited toxicological data available
CAS
1429808-42-3
Formula
Mixture
MW
Variable
Odor Family
Green · Woody
Layer 1 · Enthusiast

What Does Hexanal, 6-_(2,_4,_4-_trimethylcyclopentyl_idene)_-_, (6E)_- Smell Like?

This synthetic aldehyde delivers a vibrant green character reminiscent of freshly crushed leaves with a crisp, slightly metallic edge. The initial burst evolves into a cleaner, more transparent woody-herbal quality, like the scent of a damp forest after rain. Dry-down reveals subtle citrusy undertones that prevent the greenness from becoming overly sharp or vegetal.

Scent Profile
Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

Hexanal derivatives belong to the aldehyde class, known for their volatility and impact in fragrance compositions. The cyclopentylidene modification in this molecule introduces conformational rigidity that modifies both odor characteristics and longevity. Synthesis typically involves controlled oxidation of corresponding alcohols followed by selective hydrogenation.

Physical & Chemical Properties

Perfumer Guide

Note Position
Top
Volatility
Medium (1-2 hours)
Blending
Good
ApplicationTypical %RangeNotes
Fine Fragrance0.5-2%Up to 5%Green accent
Functional Fragrance0.1-0.5%Up to 1%Freshness booster

Classic Accords

Tip: Use sparingly in citrus compositions to add naturalistic green depth.

Alternatives & Comparisons

1
Hexanal CAS 66-25-1

The parent aldehyde for simpler green effects without woody complexity.

2
Leaf Alcohol CAS 928-96-1

For more intense grassy-green character in naturalistic compositions.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No IFRA restrictions currently apply to this material.

RIFM Assessment

Not currently evaluated by RIFM.

Sustainability

As a synthetic material, this compound avoids agricultural resource use. Production can be optimized for minimal solvent waste and energy efficiency through modern catalytic methods.

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References

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

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