Ethyl p-tolyl carbonate (CAS 22719-81-9) — Floral Top to middle Note Fragrance Ingredient
Ethyl p-tolyl carbonate
CAS 22719-81-9
What Is Ethyl p-tolyl carbonate?
Ethyl p-tolyl carbonate is a synthetic fragrance ingredient used to add subtle floral and fruity nuances to perfumes. It’s found in various personal care products and fine fragrances. This molecule matters because it helps create light, airy top notes that blend well with citrus and floral compositions, offering perfumers a versatile building block for modern accords.
Safety Profile
GENERALLY SAFEWhat Does Ethyl p-tolyl carbonate Smell Like?
Ethyl p-tolyl carbonate presents a delicate interplay of fruity-floral character with crisp green undertones. The initial impression suggests pear drops dipped in white flowers, evolving into a clean, slightly powdery heart reminiscent of fresh linen. The dry-down reveals a subtle musky warmth that lingers close to the skin. Its transparent quality makes it ideal for modern floral compositions where a lightweight, diffusive effect is desired.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as a brightening agent in the floral bouquet, adding lift to the jasmine and lily notes while preventing heaviness.
Contributes to the sparkling citrus-floral accord, enhancing the freshness without competing with the dominant lemon note.
2D Molecular Structure
SMILES: CCOC(=O)OC1=CC=C(C)C=C1
Chemistry, Properties & Perfumer Guide
The Chemistry
Ethyl p-tolyl carbonate belongs to the aromatic carbonate ester class, synthesized through the reaction of p-cresol with ethyl chloroformate. The p-tolyl group provides aromatic character while the carbonate linkage contributes stability. Its molecular structure allows for both hydrogen bonding and hydrophobic interactions, making it useful in fragrance longevity enhancement.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Point | Not available |
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Used as floral modifier |
| Personal Care | 0.1-1% | Up to 2% | Adds freshness to floral compositions |
Classic Accords
Tip: Use as a bridge between citrus top notes and floral heart notes to enhance diffusion.
Alternatives & Comparisons
Offers similar floral effects with slightly more rosy character and better substantivity.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted by IFRA standards.
RIFM Assessment
No RIFM assessment currently available for this material.
Sustainability
As a synthetic material, ethyl p-tolyl carbonate has minimal environmental impact during production. Its efficient synthesis from readily available precursors makes it a sustainable choice compared to some natural alternatives requiring extensive agricultural inputs.
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References
- Bauer, K. et al. (2001). Common Fragrance and Flavor Materials. Wiley-VCH.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 22719-81-9Physical Properties
| Molecular Weight | 180.2 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 2.9🔬 PubChem |
| Boiling Point | 234 °C🔬 EPA CompTox |
| Vapor Pressure | 0.0056 mmHg @ 25°C📊 OPERA |
| Flash Point | 102.3 °C🔬 EPA CompTox |
| Involatility Index | 0.0005💻 Calculated |
| log Kp (skin permeability) | -1.74💻 Calculated |
| SMILES | CCOC(=O)OC1=CC=C(C=C1)C🔬 PubChem |
Volatility & Performance
| Fragrance Note | Heart💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 4 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | floralsweet• leffingwell |
| Functional Groups | etheraromatic💻 RDKit |
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.
Physicochemical Properties
DTXSID: DTXSID9051878
Physical Properties
| Molecular Weight | 180.203 g/mol🔬 EPA CompTox |
| Density | 1.09 g/cm^3📊 OPERA |
| Boiling Point | 243.795 °C📊 OPERA |
| Melting Point | 17.333 °C📊 OPERA |
| Flash Point | 103.632 °C📊 OPERA |
| Refractive Index | 1.499 Dimensionless📊 OPERA |
| Molar Volume | 166.207 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 2.278 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 2.278 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 2.278 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 5.19 Log10 unitless📊 OPERA |
| Water Solubility | 0.003 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.008 mmHg📊 OPERA |
| Viscosity | 5.574 cP📊 OPERA |
| Surface Tension | 33.655 dyn/cm📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 35.53 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 3 count💻 Computed |
| Rotatable Bonds | 2 count💻 Computed |
| Aromatic Rings | 1 count💻 Computed |
| Molar Refractivity | 48.797 cm^3/mol📊 OPERA |
| Polarizability | 19.345 Å^3📊 OPERA |
Data Sources:
🔬 EPA Experimental data from U.S. EPA CompTox Chemicals Dashboard & CTX APIs. 📊 OPERA Predicted using EPA's OPERA QSAR models. 💻 Computed Calculated from SMILES using RDKit.
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