p-Tolylacetaldehyde (CAS 0104-09-06) — Floral Top to Middle Note Fragrance Ingredient
p-Tolylacetaldehyde
CAS 0104-09-06
What Is p-Tolylacetaldehyde?
p-Tolylacetaldehyde is a synthetic aromatic compound used in perfumery to add floral and green nuances. It’s found in many modern fragrances, particularly those aiming for a fresh, slightly powdery character. This aldehyde matters because it bridges natural and synthetic accords, offering perfumers a versatile tool for creating complex scent profiles with excellent stability.
Safety Profile
GENERALLY SAFEWhat Does p-Tolylacetaldehyde Smell Like?
p-Tolylacetaldehyde opens with a crisp, green freshness reminiscent of crushed stems, evolving into a delicate floralcy akin to hyacinth petals dusted with powdered sugar. As it dries, it reveals a subtle almond-like nuance wrapped in clean muskiness, behaving like a shy dancer who gradually gains confidence on stage. The dry-down leaves a lingering impression of starched linens dried in a spring garden.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used to amplify the green galbanum note while softening the floral heart with its powdery-aldehyde character.
Provides structural support to the hyper-green accord, preventing it from becoming too sharp or linear.
Chemistry, Properties & Perfumer Guide
The Chemistry
p-Tolylacetaldehyde belongs to the aromatic aldehyde class, featuring a para-methyl substituted benzene ring. Industrially synthesized via Friedel-Crafts alkylation followed by oxidation, this compound demonstrates typical aldehyde reactivity while offering superior stability compared to aliphatic aldehydes. The electron-donating methyl group influences both its olfactory character and chemical behavior.
Physical & Chemical Properties
| Boiling Point | 220-222 °C |
|---|---|
| Density | 1.015 g/cm³ |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-3% | Up to 5% | Adds diffusive floral-green facets |
| Functional Fragrance | 0.5-1% | Up to 2% | Provides fresh linen character |
Classic Accords
Tip: Use with ionones to create sophisticated powder notes without excessive sweetness.
Alternatives & Comparisons
More honeyed and intense, useful when a stronger floral impact is desired.
Offers similar green freshness but with better water solubility for functional applications.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions currently apply to p-Tolylacetaldehyde.
EU Allergen Declaration
Not listed in EU allergen regulations.
RIFM Assessment
RIFM evaluation confirms safe use at current industry concentrations.
Sustainability
As a synthetic material, p-Tolylacetaldehyde production avoids agricultural impacts but requires petrochemical feedstocks. Modern manufacturing processes have significantly reduced energy consumption and waste generation compared to early synthesis methods.
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References
- Bauer et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH.
- Arctander, S. (1969). Perfume and Flavor Chemicals. Allured.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
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