Benzaldehyde propylene glycol acetal (CAS 2568-25-4) — Sweet Middle Note Fragrance Ingredient
Benzaldehyde propylene glycol acetal
CAS 2568-25-4
What Is Benzaldehyde propylene glycol acetal?
Benzaldehyde propylene glycol acetal is a synthetic fragrance ingredient that creates almond-like aromas. It’s found in food flavorings, perfumes, and household products. This ingredient matters because it provides a stable, long-lasting almond note without the volatility of natural benzaldehyde, making fragrances more durable.
Safety Profile
GENERALLY SAFEWhat Does Benzaldehyde propylene glycol acetal Smell Like?
Benzaldehyde propylene glycol acetal offers a sweet, marzipan-like aroma with nuances of cherry and nutty undertones. Unlike pure benzaldehyde, it lacks the sharp initial bite, unfolding instead as a smooth, rounded almond note. Over time, it reveals a subtle woody warmth, making it ideal for gourmand and oriental compositions where a persistent almond facet is desired.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used to enhance the vanilla-almond accord, providing a sweet, persistent gourmand note that blends seamlessly with warm spices and woods.
Adds a refined almond nuance to the citrus-woody structure, creating a sophisticated yet comforting signature.
2D Molecular Structure
SMILES: CC1COC(O1)C1=CC=CC=C1
Chemistry, Properties & Perfumer Guide
The Chemistry
Benzaldehyde propylene glycol acetal is a synthetic aromatic compound formed by the reaction of benzaldehyde with propylene glycol. This acetal formation stabilizes the aldehyde group, reducing volatility and increasing longevity. It is typically produced through acid-catalyzed condensation, resulting in a compound that retains the almond character of benzaldehyde while offering improved stability in formulations.
Physical & Chemical Properties
| Boiling Point | Not specified |
|---|---|
| Density | Not specified |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-5% | Up to 10% | Adds sweet almond nuances |
| Food Flavoring | 0.1-1% | Up to 2% | Used in marzipan and cherry flavors |
Classic Accords
Tip: Blends well with vanilla, tonka, and woody notes for gourmand fragrances.
Alternatives & Comparisons
Use for a sharper, more volatile almond note, but requires careful handling due to higher reactivity.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions. Generally recognized as safe for use in fragrances.
EU Allergen Declaration
Not listed as an EU allergen.
RIFM Assessment
RIFM has assessed benzaldehyde propylene glycol acetal as safe for current use levels.
Sustainability
As a synthetic ingredient, benzaldehyde propylene glycol acetal offers consistent quality and reduces reliance on natural resources. Production can be optimized for low environmental impact through green chemistry principles.
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References
- PubChem: Benzaldehyde propylene glycol acetal PubChem
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 2568-25-4Physical Properties
| Molecular Weight | 164.2 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 1.8🔬 PubChem |
| Boiling Point | 245 °C🔬 EPA CompTox |
| Vapor Pressure | 0.0107 mmHg @ 25°C📊 OPERA |
| Flash Point | 101.7 °C🔬 EPA CompTox |
| Involatility Index | 0.0009💻 Calculated |
| log Kp (skin permeability) | -2.424💻 Calculated |
| SMILES | CC1COC(O1)C2=CC=CC=C2🔬 PubChem |
Volatility & Performance
| Fragrance Note | Heart💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 2.9 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | almondcherryodorless• leffingwell |
| Functional Groups | etheraromatic💻 RDKit |
| A colorless liquid with a very mild almond-like odor.📖 Fenaroli | |
Regulatory Status
| IOFI Classification | Artificial📖 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: DTXSID60862989
Physical Properties
| Molecular Weight | 164.204 g/mol🔬 EPA CompTox |
| Density | 1.091 g/cm^3📊 OPERA |
| Boiling Point | 245.142 °C📊 OPERA |
| Melting Point | 20.88 °C📊 OPERA |
| Flash Point | 95.904 °C📊 OPERA |
| Refractive Index | 1.508 Dimensionless📊 OPERA |
| Molar Volume | 154.978 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 2.377 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 2.377 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 2.377 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 5.26 Log10 unitless📊 OPERA |
| Water Solubility | 0.019 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.035 mmHg📊 OPERA |
| Viscosity | 4.699 cP📊 OPERA |
| Surface Tension | 36.348 dyn/cm📊 OPERA |
| Thermal Conductivity | 128.698 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 18.46 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 2 count💻 Computed |
| Rotatable Bonds | 1 count💻 Computed |
| Aromatic Rings | 1 count💻 Computed |
| Molar Refractivity | 46.198 cm^3/mol📊 OPERA |
| Polarizability | 18.314 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.
