Acetaldehyde ethyl phenylethyl acetal (CAS 2556-10-7) — Floral Top Note Fragrance Ingredient
Acetaldehyde ethyl phenylethyl acetal
CAS 2556-10-7
What Is Acetaldehyde ethyl phenylethyl acetal?
Acetaldehyde ethyl phenylethyl acetal is a synthetic fragrance ingredient used to add green, floral, and slightly fruity nuances to perfumes. It’s commonly found in fine fragrances and personal care products. This ingredient matters because it enhances freshness and complexity in scent compositions, often contributing to the top notes that create first impressions.
Safety Profile
GENERALLY SAFEWhat Does Acetaldehyde ethyl phenylethyl acetal Smell Like?
Acetaldehyde ethyl phenylethyl acetal offers a crisp, green opening with floral undertones, reminiscent of freshly cut stems and dewy petals. As it evolves, it reveals a subtle fruity sweetness, like ripe pears in a sunlit orchard. The dry-down is clean and slightly woody, leaving a transparent trail that blends seamlessly with other notes.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used to enhance the floral bouquet, adding a fresh green lift to the iconic aldehydic opening.
Contributes to the sparkling top notes, complementing the floral heart with its crisp green character.
2D Molecular Structure
SMILES: CCOC(C)OCCC1=CC=CC=C1
Chemistry, Properties & Perfumer Guide
The Chemistry
Acetaldehyde ethyl phenylethyl acetal is a synthetic acetal derived from acetaldehyde and phenylethyl alcohol. It belongs to the class of acetals, which are known for their stability and fresh olfactory profiles. The compound is typically synthesized through acid-catalyzed reactions, offering good yield and purity for perfumery applications.
Physical & Chemical Properties
| Boiling Point | N/A |
|---|---|
| Density | N/A |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-3% | Up to 5% | Adds fresh green floral nuances |
| Personal Care | 0.5-2% | Up to 3% | Enhances freshness in soaps and lotions |
Classic Accords
Tip: Use in small amounts to brighten floral compositions without overpowering.
Alternatives & Comparisons
Offers a similar floral character but with more pronounced rosy notes.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No IFRA restrictions currently apply to this ingredient.
RIFM Assessment
RIFM has assessed this ingredient as safe for use in current practices.
Sustainability
As a synthetic ingredient, acetaldehyde ethyl phenylethyl acetal is produced in controlled environments with minimal environmental impact. Its synthesis avoids the need for natural resource extraction, making it a sustainable choice for modern perfumery.
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References
- PubChem Compound Summary for Acetaldehyde ethyl phenylethyl acetal PubChem
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID6051930
Physical Properties
| Molecular Weight | 194.274 g/mol🔬 EPA CompTox |
| Density | 0.959 g/cm^3🔬 EPA CTX |
| Boiling Point | 248.2 °C🔬 EPA CTX |
| Melting Point | 0.122 °C📊 OPERA |
| Flash Point | 104 °C🔬 EPA CTX |
| Refractive Index | 1.486 Dimensionless📊 OPERA |
| Molar Volume | 201.379 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.5 Log10 unitless🔬 EPA CTX |
| LogD (pH 5.5) | 2.729 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 2.729 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 6.1 Log10 unitless📊 OPERA |
| Water Solubility | 0.002 mol/L🔬 EPA CTX |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.023 mmHg🔬 EPA CTX |
| Viscosity | 3.559 cP📊 OPERA |
| Surface Tension | 32.942 dyn/cm📊 OPERA |
| Thermal Conductivity | 135.211 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 | 6 count💻 Computed |
| Aromatic Rings | 1 count💻 Computed |
| Molar Refractivity | 57.783 cm^3/mol📊 OPERA |
| Polarizability | 22.907 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.
