Carbonic acid, 2-hydroxyethyl 5-methyl-2-(1-methylethyl)cyclohexyl ester (CAS 156679-39-9) — Green Middle Note Fragrance Ingredient

ByThe Good Scents
Green · Woody

Carbonic acid, 2-hydroxyethyl 5-methyl-2-(1-methylethyl)cyclohexyl ester

CAS 156679-39-9

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

What Is Carbonic acid, 2-hydroxyethyl 5-methyl-2-(1-methylethyl)cyclohexyl ester?

This synthetic ingredient is a specialized ester used in niche perfumery. It appears in avant-garde fragrances seeking unusual woody-green effects. The molecule offers perfumers a unique bridge between fresh citrus top notes and deeper woody bases, creating novel scent transitions that defy traditional categories.

Safety Profile

GENERALLY SAFE
Generally safeUse with awarenessProfessional use
✓ No major restrictions
⚠ Limited safety data available
CAS
156679-39-9
Formula
Mixture
MW
Variable
Odor Family
Green · Woody
Layer 1 · Enthusiast

What Does Carbonic acid, 2-hydroxyethyl 5-methyl-2-(1-methylethyl)cyclohexyl ester Smell Like?

Opens with a crisp, almost metallic greenness reminiscent of crushed stems, then unfolds into a complex woody heart with subtle citrus undertones. The dry-down reveals a faintly camphoraceous character that lingers close to the skin, like the memory of walking through a coniferous forest after rain.

Scent Profile
Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

This ester belongs to the cyclohexanol family, synthesized through esterification of menthol derivatives. Its unique structure creates both hydrophilic and lipophilic properties, allowing it to bridge aqueous and oil-based fragrance systems. The molecule’s stereochemistry significantly impacts its odor profile, with different enantiomers exhibiting distinct scent characteristics.

Physical & Chemical Properties

AppearanceColorless to pale yellow liquid
Molecular Weight228.32 g/mol

Perfumer Guide

Note Position
Middle
Volatility
Medium (2-4 hours)
Blending
Good
ApplicationTypical %RangeNotes
Conceptual Fragrances0.5-2%Up to 5%For avant-garde compositions
Functional Products0.1-0.5%Up to 1%Limited use due to cost

Classic Accords

Tip: Use with citrus top notes to enhance freshness without being overly fruity.

Alternatives & Comparisons

1
Menthyl acetate CAS 89-48-5

For similar cooling effects but with stronger minty character.

2
Ambroxide CAS 6790-58-5

When seeking woody-ambergris dry-down with better diffusion.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No current IFRA restrictions.

RIFM Assessment

Not currently assessed by RIFM.

Sustainability

Synthesized from petrochemical precursors, this material represents modern perfumery’s ability to create novel scent molecules. While not renewable, its high potency means minimal quantities are required in formulations. Future development could explore bio-based synthetic routes.

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References

  1. PubChem Compound Summary PubChem

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

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