alpha-Amylcinnamaldehyde dimethyl acetal (CAS 91-87-2) — Floral Heart to base Note Fragrance Ingredient
alpha-Amylcinnamaldehyde dimethyl acetal
CAS 91-87-2
What Is alpha-Amylcinnamaldehyde dimethyl acetal?
alpha-Amylcinnamaldehyde dimethyl acetal is a synthetic fragrance ingredient commonly found in perfumes and personal care products. It contributes a warm, floral, and slightly spicy character to fragrances. This molecule is valued for its ability to enhance floral bouquets and add depth to oriental and amber accords, making it a versatile tool for perfumers seeking long-lasting floralcy.
Safety Profile
USE WITH AWARENESSWhat Does alpha-Amylcinnamaldehyde dimethyl acetal Smell Like?
A radiant floral burst with jasmine-like facets evolves into a warm, honeyed heart with subtle cinnamon spice undertones. The dry-down reveals a persistent ambery sweetness that lingers on skin, behaving like a molecular bridge between top and base notes. Its tenacity makes it particularly valuable in floral-oriental compositions where it adds both lift and depth simultaneously.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Used as a jasmine enhancer in this iconic floral-oriental, adding warmth and persistence to the tuberose-jasmine heart while smoothing the transition to vanilla base notes.
Contributes to the floral-spicy complexity, helping bridge the citrus top to the balsamic base with its persistent floral-amber character.
2D Molecular Structure
SMILES: CCCCCC(=CC1=CC=CC=C1)C(OC)OC
Chemistry, Properties & Perfumer Guide
The Chemistry
This acetal derivative belongs to the cinnamaldehyde chemical family, created by protecting the aldehyde group of amylcinnamaldehyde with methanol. The dimethyl acetal modification increases stability and modifies odor characteristics, producing a more floral, less aggressive scent compared to the parent aldehyde. Industrial synthesis typically involves acid-catalyzed reaction of amylcinnamaldehyde with methanol.
Physical & Chemical Properties
| Appearance | Colorless to pale yellow liquid |
|---|---|
| Boiling Point | Approx. 300 °C (estimated) |
| Density | ~0.95 g/cm³ (estimated) |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 1-3% | Up to 5% | Adds floral persistence in oriental compositions |
| Soap | 0.5-1% | Up to 2% | Provides stable floral character in alkaline media |
Classic Accords
Tip: Use to extend floral top notes downward into the heart of a composition while adding warmth.
Alternatives & Comparisons
The parent aldehyde offers stronger jasmine character but less stability and more potential for skin sensitization.
Similar floral profile with better safety profile, though slightly less warm and ambery in character.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
Not currently restricted under IFRA standards. Listed in IFRA Transparency List with no usage limits specified.
EU Allergen Declaration
Not listed in EU allergen regulation (EC) No 1223/2009 Annex III.
GHS Classification
RIFM Assessment
RIFM has reviewed available data and found no significant safety concerns at current usage levels in fragrance applications.
Sustainability
As a synthetic material, production avoids agricultural land use but depends on petrochemical feedstocks. The acetal modification improves stability, potentially reducing waste from product degradation. Manufacturers are increasingly adopting green chemistry principles in synthesis.
Explore alpha-Amylcinnamaldehyde dimethyl acetal
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References
- Bickers et al. (2005). Safety assessment of cinnamyl derivatives. Food and Chemical Toxicology. PMID 15854760
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorPhysicochemical Properties
DTXSID: DTXSID1052612
Physical Properties
| Molecular Weight | 248.366 g/mol🔬 EPA CompTox |
| Density | 0.953 g/cm^3📊 OPERA |
| Boiling Point | 332.332 °C📊 OPERA |
| Melting Point | 29.304 °C📊 OPERA |
| Flash Point | 124.466 °C📊 OPERA |
| Refractive Index | 1.513 Dimensionless📊 OPERA |
| Molar Volume | 258.859 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 4.356 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 4.356 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 4.356 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 8.41 Log10 unitless📊 OPERA |
| Water Solubility | 0.001 mol/L📊 OPERA |
| Henry's Law Constant | 0 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 0 mmHg📊 OPERA |
| Viscosity | 8.817 cP📊 OPERA |
| Surface Tension | 34.452 dyn/cm📊 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 | 1 count💻 Computed |
| Molar Refractivity | 77.864 cm^3/mol📊 OPERA |
| Polarizability | 30.868 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.
