2-tert-Butylhydroquinone (CAS 1948-33-0) — Woody N/A Note Fragrance Ingredient
2-tert-Butylhydroquinone
CAS 1948-33-0
What Is 2-tert-Butylhydroquinone?
2-tert-Butylhydroquinone is a synthetic antioxidant commonly used in food packaging and some industrial applications. While not a traditional fragrance ingredient, it may appear in trace amounts in perfumes as a stabilizer. Consumers primarily encounter it as a preservative in processed foods and cosmetics rather than as a scent component.
Safety Profile
USE WITH AWARENESSWhat Does 2-tert-Butylhydroquinone Smell Like?
2-tert-Butylhydroquinone is not primarily used for its odor profile in perfumery. When detectable, it presents a faint phenolic, slightly medicinal character with subtle rubbery undertones. The scent is persistent but generally considered undesirable in fragrance compositions, appearing mainly as an artifact of its preservative function rather than an intentional olfactory element.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Chemistry, Properties & Perfumer Guide
The Chemistry
2-tert-Butylhydroquinone is a synthetic phenolic antioxidant belonging to the hydroquinone family. It’s produced through alkylation of hydroquinone with isobutylene. The tert-butyl group provides steric hindrance that enhances its antioxidant properties. This compound is primarily valued for its ability to inhibit lipid peroxidation rather than for any olfactory characteristics.
Physical & Chemical Properties
| Melting Point | 126-128 °C |
|---|
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Industrial | 0.01-0.02% | Up to 0.1% | Used as stabilizer |
| Food | 0.02% max | Regulated | Preservative |
Classic Accords
Tip: Not recommended as fragrance ingredient – use only as stabilizer when absolutely necessary.
Alternatives & Comparisons
Alternative antioxidant with better safety profile and less odor impact in formulations.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted by IFRA but not recommended as fragrance ingredient.
GHS Classification
RIFM Assessment
Not evaluated by RIFM as it’s not a fragrance material.
Sustainability
As a synthetic petrochemical derivative, 2-tert-Butylhydroquinone has moderate environmental impact in production. Its persistence in the environment is a concern, though usage levels are typically low. Green chemistry alternatives are preferred when possible.
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References
- PubChem Compound Summary for 2-tert-Butylhydroquinone PubChem
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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