Cyclohexene, 1-methyl-4-(1-methylethenyl)-, sulfurized (CAS 68921-26-6) — Woody Base Note Fragrance Ingredient

ByThe Good Scents
Woody · Spicy

Cyclohexene, 1-methyl-4-(1-methylethenyl)-, sulfurized

CAS 68921-26-6

Origin
synthetic
Note
Base
IFRA
Professional use
Data as of: Apr 2026

What Is Cyclohexene, 1-methyl-4-(1-methylethenyl)-, sulfurized?

This synthetic fragrance ingredient is a sulfurized terpene derivative, primarily encountered in industrial fragrance applications and some niche perfumery. It contributes unique sulfurous nuances to compositions. While not common in consumer products, it’s valued by perfumers for adding depth and complexity to certain accords.

Safety Profile

PROFESSIONAL USE
Generally safeUse with awarenessProfessional use
⚠ Requires proper handling
⚠ Potential skin sensitizer
CAS
68921-26-6
Formula
Mixture
MW
Variable
Odor Family
Woody · Spicy
Layer 1 · Enthusiast

What Does Cyclohexene, 1-methyl-4-(1-methylethenyl)-, sulfurized Smell Like?

This sulfurized terpene delivers a complex olfactory profile – opening with sharp, pungent sulfur notes reminiscent of struck matches or volcanic minerals. The sulfur character gradually reveals underlying woody-terpenic aspects, with a dry-down that suggests charred woods and warm minerals. The evolution is slow, with sulfur notes persisting through the heart phase before settling into a smoky-woody base.

Scent Profile
Layer 2

Chemistry, Properties & Perfumer Guide

The Chemistry

This compound is a sulfurized derivative of limonene, created through controlled sulfur addition reactions to the terpene backbone. The sulfur atoms introduce new chiral centers and significantly alter the molecule’s olfactory properties compared to its parent terpene. Industrial synthesis typically involves reacting limonene with elemental sulfur or sulfur-containing reagents under controlled conditions.

Physical & Chemical Properties

Perfumer Guide

Note Position
Base
Volatility
Low (hours-days)
Blending
Specialized
ApplicationTypical %RangeNotes
Fine Fragrance0.1-0.5%Up to 1%Used sparingly for sulfurous effects
Functional Fragrance0.05-0.2%Up to 0.5%Masking applications

Classic Accords

Tip: Use in trace amounts to avoid overwhelming compositions with sulfur notes.

Alternatives & Comparisons

1
Sulfurol CAS 1073-29-6

Less aggressive sulfur character with fruity nuances, suitable when a softer sulfur effect is desired.

Layer 3

Safety, Regulatory & Sustainability

⚠ Regulatory Disclaimer

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

IFRA Status

No specific IFRA restrictions, but recommended usage levels should be followed due to potential sensitization.

GHS Classification

H315 Skin irritation H319 Eye irritation H335 May cause respiratory irritation

RIFM Assessment

No RIFM assessment currently available for this specific compound.

Sustainability

As a synthetic material, this ingredient avoids natural resource depletion concerns. However, sulfur chemistry requires careful waste management. Modern production methods aim to minimize environmental impact through closed-loop systems and catalyst recovery.

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References

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

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    Ingredient Data Sheet

    CAS 68921-26-6
    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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