Octanal dimethyl acetal (CAS 10022-28-3) — Citrus Top Note Fragrance Ingredient
Octanal dimethyl acetal
CAS 10022-28-3
What Is Octanal dimethyl acetal?
Octanal dimethyl acetal is a synthetic fragrance ingredient used to create fresh, citrusy notes in perfumes and household products. You’ll encounter it in air fresheners, cleaning products, and some citrus-forward perfumes. This molecule matters because it provides a stable, long-lasting citrus character that doesn’t fade quickly like natural citrus oils. It’s particularly valuable in formulations where photostability is important.
Safety Profile
GENERALLY SAFEWhat Does Octanal dimethyl acetal Smell Like?
Octanal dimethyl acetal opens with a burst of crisp, aldehydic citrus reminiscent of freshly peeled orange zest, but cleaner and more refined than the natural oil. The heart reveals a subtle green nuance like citrus leaves crushed between fingers, with a faint waxy undertone that adds sophistication. As it dries down, it maintains remarkable tenacity for a citrus note, transitioning to a soft, slightly soapy character that blends beautifully with floral and woody materials. Unlike natural citrus oils that vanish quickly, this acetal provides hours of bright, uplifting citrus presence.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used here to extend the citrus top notes and create the signature sparkling freshness that lasts beyond the initial application.
Provides the clean citrus accord that defines this unisex fragrance’s bright, modern character.
2D Molecular Structure
SMILES: CCCCCCCC(OC)OC
Chemistry, Properties & Perfumer Guide
The Chemistry
Octanal dimethyl acetal belongs to the acetal class of compounds, formed by reacting octanal with methanol. Acetals are prized in perfumery for their stability compared to aldehydes, resisting oxidation while maintaining similar olfactory profiles. This synthetic material doesn’t occur in nature but mimics aspects of citrus peel chemistry. The dimethyl acetal modification increases molecular weight and reduces volatility, creating a longer-lasting citrus effect than the parent aldehyde.
Physical & Chemical Properties
| Appearance | Colorless liquid |
|---|---|
| Boiling Point | Approx. 180-190°C |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.5-2% | Up to 5% | Citrus accords |
| Functional Fragrance | 0.1-1% | Up to 3% | Cleaning products |
Classic Accords
Tip: Use to anchor natural citrus oils and prevent rapid top note evaporation.
Alternatives & Comparisons
When a heavier, more waxy citrus character is desired with better longevity.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not restricted under current IFRA standards.
RIFM Assessment
Considered safe at current usage levels based on RIFM data.
Sustainability
As a synthetic material, octanal dimethyl acetal doesn’t require agricultural land or harvest of natural resources. Its production from petrochemical feedstocks raises some environmental concerns, but its efficiency in formulations (requiring smaller quantities than natural citrus oils) can reduce overall environmental impact in finished products.
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References
- Bauer et al. (2001). Common Fragrance and Flavor Materials.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 10022-28-3Physical Properties
| Molecular Weight | 174.28 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 3.5🔬 PubChem |
| Boiling Point | 185 °C🔬 EPA CompTox |
| Vapor Pressure | 0.0939 mmHg @ 25°C📊 OPERA |
| Flash Point | 85 °C🔬 EPA CompTox |
| Involatility Index | 0.0077💻 Calculated |
| log Kp (skin permeability) | -1.278💻 Calculated |
| SMILES | CCCCCCCC(OC)OC🔬 PubChem |
Volatility & Performance
| Fragrance Note | Heart💻 Calculated |
| Volatility Class | Very slow💻 Calculated |
| Persistence Score | 2 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | citrusfreshgreenorangewaxy• leffingwell |
| Functional Groups | ether💻 RDKit |
| “Powerful oily-green and waxy-citrusy odor The normal concentration is about 0.5 to of poor tenacity. The odor of the Dimethylacetal is not quite G.R.A.S.”📖 Arctander | |
| Octanal dimethyl acetal has a green, woody, citrusy odor reminiscent of cognac.📖 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: DTXSID1047520
Physical Properties
| Molecular Weight | 174.284 g/mol🔬 EPA CompTox |
| Density | 0.847 g/cm^3🔬 EPA CTX |
| Boiling Point | 202.5 °C🔬 EPA CTX |
| Melting Point | -60.051 °C📊 OPERA |
| Flash Point | 85 °C🔬 EPA CTX |
| Refractive Index | 1.416 Dimensionless📊 OPERA |
| Molar Volume | 206.704 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 3.854 Log10 unitless🔬 EPA CTX |
| LogD (pH 5.5) | 3.36 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 3.36 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 5.01 Log10 unitless📊 OPERA |
| Water Solubility | 0.001 mol/L🔬 EPA CTX |
| Henry's Law Constant | 0.001 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0.094 mmHg🔬 EPA CTX |
| Viscosity | 1.478 cP📊 OPERA |
| Surface Tension | 25.557 dyn/cm📊 OPERA |
| Thermal Conductivity | 132.298 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 | 8 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 51.827 cm^3/mol📊 OPERA |
| Polarizability | 20.546 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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