Acetyl propionyl (CAS 600-14-6) — Sweet Top to middle Note Fragrance Ingredient
Acetyl propionyl
CAS 600-14-6
What Is Acetyl propionyl?
Acetyl propionyl is a synthetic compound used in flavor and fragrance compositions. It’s primarily encountered in food flavorings and some industrial fragrance applications. This ingredient matters as a versatile building block that helps create buttery, caramel-like notes when used in combination with other aroma chemicals.
Safety Profile
USE WITH AWARENESSWhat Does Acetyl propionyl Smell Like?
Acetyl propionyl presents a complex olfactory profile with a sharp, buttery top note that evolves into a warm, caramelized sugar heart. The dry-down reveals subtle diacetyl-like qualities with a faintly metallic edge. When diluted, it contributes creamy dairy nuances reminiscent of warm butter and toasted nuts, though it requires careful blending as it can dominate compositions at higher concentrations.
2D Molecular Structure
SMILES: CCC(=O)C(C)=O
Chemistry, Properties & Perfumer Guide
The Chemistry
Acetyl propionyl is a diketone compound structurally similar to diacetyl. As a synthetic molecule, it’s produced through controlled oxidation or condensation reactions of appropriate precursors. Its chemical reactivity makes it useful for creating complex flavor profiles, though its precise behavior in fragrance matrices requires careful formulation due to potential volatility and reactivity issues.
Physical & Chemical Properties
| Boiling Point | Not well documented |
|---|---|
| Density | Not well documented |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Food Flavors | 0.1-1% | Up to 2% | Buttery note enhancer |
| Industrial Fragrance | 0.05-0.5% | Up to 1% | Used in trace amounts |
Classic Accords
Tip: Use in minimal quantities and always test for stability in final formulations.
Alternatives & Comparisons
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions, but general diketone handling precautions apply.
GHS Classification
RIFM Assessment
Not currently evaluated by RIFM as a standalone fragrance ingredient.
Sustainability
As a synthetic compound, acetyl propionyl’s environmental impact depends on manufacturing processes. While it doesn’t require agricultural resources, its production involves petrochemical inputs. Responsible manufacturers implement closed systems to minimize emissions during production.
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References
- PubChem Compound Summary for Acetyl propionyl PubChem
- Flavor and Extract Manufacturers Association (FEMA) safety assessment FEMA
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 600-14-6Physical Properties
| Molecular Weight | 100.12 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 0.1🔬 PubChem |
| Boiling Point | 109.9 °C🔬 EPA CompTox |
| Vapor Pressure | 21.4 mmHg @ 25°C📊 OPERA |
| Flash Point | -7.2 °C🔬 EPA CompTox |
| Involatility Index | 2.3051💻 Calculated |
| log Kp (skin permeability) | -3.24💻 Calculated |
| SMILES | CCC(=O)C(=O)C🔬 PubChem |
Volatility & Performance
| Fragrance Note | Top💻 Calculated |
| Volatility Class | Fast💻 Calculated |
| Persistence Score | 0.5 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | butteryfatty• leffingwell |
| Functional Groups | ketone💻 RDKit |
| “Aqueous solutions taste sweet, the oily-buttery aroma appears only at higher concentration where odor interferes with actual”📖 Arctander | |
| 2,3-Pentanedione has a somewhat sweet odor similar to quinone. This compound has a penetrating, buttery taste on dilution.📖 Fenaroli | |
Flavor Notes (Arctander)
| “Soluble 7% in water, miscible with alcohol and flavor materials, Propylene glycol and Glycerin. Aqueous solutions taste sweet, the oily-buttery aroma appears only at higher concentration where odor interferes with actual taste. Weak aqueous solutions are practically odorless.”📖 Arctander |
Sensory Thresholds
| Odor Detection Threshold | 0.0233 ppm (n=3)📖 van Gemert |
Regulatory Status
| FEMA Number | FEMA 2841⚖️ FEMA GRAS |
| GRAS Status | Generally Recognized as Safe⚖️ FEMA GRAS |
| IOFI Classification | Nature Identical📖 Fenaroli |
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: DTXSID6051435
Physical Properties
| Molecular Weight | 100.117 g/mol🔬 EPA CompTox |
| Density | 0.97 g/cm^3🔬 EPA CTX |
| Boiling Point | 110.003 °C🔬 EPA CTX |
| Melting Point | -52 °C🔬 EPA CTX |
| Flash Point | 19.318 °C🔬 EPA CTX |
| Refractive Index | 1.395 Dimensionless📊 OPERA |
| Molar Volume | 105.309 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | -0.188 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | -0.188 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | -0.188 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 4.01 Log10 unitless📊 OPERA |
| Water Solubility | 0.666 mol/L🔬 EPA CTX |
| Henry's Law Constant | 0 atm-m3/mole🔬 EPA CTX |
Transport Properties
| Vapor Pressure | 20.484 mmHg🔬 EPA CTX |
| Viscosity | 0.634 cP📊 OPERA |
| Surface Tension | 28.731 dyn/cm📊 OPERA |
| Thermal Conductivity | 151.471 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 34.14 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 2 count💻 Computed |
| Rotatable Bonds | 2 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 25.272 cm^3/mol📊 OPERA |
| Polarizability | 10.019 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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