1-(Methylthio)-1-propene (CAS 10152-77-9) — Spicy Top Note Fragrance Ingredient
1-(Methylthio)-1-propene
CAS 10152-77-9
What Is 1-(Methylthio)-1-propene?
1-(Methylthio)-1-propene is a synthetic sulfur compound used in fragrance formulations. It’s found in trace amounts in some foods but primarily encountered in perfumes and flavorings. This ingredient matters because it contributes unique savory, garlic-like notes that perfumers use to create intriguing contrasts in compositions.
Safety Profile
USE WITH AWARENESSWhat Does 1-(Methylthio)-1-propene Smell Like?
1-(Methylthio)-1-propene delivers a pungent, diffusive aroma reminiscent of crushed garlic cloves with metallic undertones. The initial burst is intensely sulfurous, evolving into a cooked cabbage heart note. In drydown, it leaves a lingering savory character akin to roasted onions. Used in minute quantities, it adds intriguing savory depth to floral bouquets and fruity accords.
In Famous Fragrances
Fragrance associations may not reflect actual formulations.
Provides a sharp, metallic edge to contrast the vetiver heart, enhancing the fragrance’s modern interpretation of classic woody notes.
Used sparingly to amplify the truffle accord, contributing to the fragrance’s mysterious, gourmand-adjacent character.
2D Molecular Structure
SMILES: CSC=CC
Chemistry, Properties & Perfumer Guide
The Chemistry
1-(Methylthio)-1-propene belongs to the class of aliphatic sulfur compounds. It’s synthesized through the reaction of allyl chloride with sodium methanethiolate. The molecule features a reactive double bond adjacent to the thioether group, making it prone to oxidation. Its volatility and polarity make it useful for creating diffusive top notes in fragrance compositions.
Physical & Chemical Properties
| Boiling Point | Not available |
|---|---|
| Density | Not available |
Perfumer Guide
| Application | Typical % | Range | Notes |
|---|---|---|---|
| Fine Fragrance | 0.01-0.1% | Up to 0.5% | Used as trace modifier |
| Functional Fragrance | 0.001-0.01% | Up to 0.05% | Masking agent |
Classic Accords
Tip: Always pre-dilute to 1% or lower before incorporating into blends due to extreme potency.
Alternatives & Comparisons
Less aggressive sulfur character with similar functionality, preferred when a softer garlic note is desired.
Safety, Regulatory & Sustainability
⚠ Regulatory Disclaimer
General reference only. Consult current IFRA Standards Library before formulating.
IFRA Status
No specific IFRA restrictions. General sulfur compound guidelines apply.
GHS Classification
RIFM Assessment
Not currently assessed by RIFM. Use according to general sulfur compound safety guidelines.
Sustainability
As a synthetic material, production involves petrochemical feedstocks. However, its extreme potency means minimal quantities are required, resulting in low environmental impact per finished product.
Explore 1-(Methylthio)-1-propene
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References
- Burdock, G.A. (2010). Fenaroli’s Handbook of Flavor Ingredients. CRC Press.
Data: PubChem (NIH), PubMed, RIFM, IFRA. Last reviewed: Apr 2026.
Report a data errorIngredient Data Sheet
CAS 10152-77-9Physical Properties
| Molecular Weight | 88.17 g/mol🔬 PubChem |
| LogP (Octanol-Water) | 1.6🔬 PubChem |
| Boiling Point | 94 °C🔬 EPA CompTox |
| Vapor Pressure | 38.0189 mmHg @ 25°C📊 OPERA |
| Flash Point | 9.1 °C🔬 EPA CompTox |
| Involatility Index | 4.3638💻 Calculated |
| log Kp (skin permeability) | -2.102💻 Calculated |
| SMILES | CC=CSC🔬 PubChem |
Volatility & Performance
| Fragrance Note | Top💻 Calculated |
| Volatility Class | Very fast💻 Calculated |
| Persistence Score | 0.5 / 5💻 Calculated |
Odor & Flavor
| Primary Descriptors | spicysweet• leffingwell |
| Functional Groups | alkene💻 RDKit |
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: DTXSID20864227
Physical Properties
| Molecular Weight | 88.17 g/mol🔬 EPA CompTox |
| Density | 0.89 g/cm^3🔬 EPA CTX |
| Boiling Point | 96.6 °C📊 OPERA |
| Melting Point | -86.633 °C📊 OPERA |
| Flash Point | 10.639 °C📊 OPERA |
| Refractive Index | 1.473 Dimensionless📊 OPERA |
| Molar Volume | 102.147 cm^3/mol📊 OPERA |
Partition & Solubility
| LogP (Octanol-Water) | 2.01 Log10 unitless📊 OPERA |
| LogD (pH 5.5) | 2.01 Log10 unitless📊 OPERA |
| LogD (pH 7.4) | 2.01 Log10 unitless📊 OPERA |
| LogKoa (Octanol-Air) | 3.18 Log10 unitless📊 OPERA |
| Water Solubility | 0.037 mol/L📊 OPERA |
| Henry's Law Constant | 0.003 atm-m3/mole📊 OPERA |
Transport Properties
| Vapor Pressure | 39.034 mmHg📊 OPERA |
| Viscosity | 0.542 cP📊 OPERA |
| Surface Tension | 24.513 dyn/cm📊 OPERA |
| Thermal Conductivity | 126.01 mW/(m*K)📊 OPERA |
Molecular Descriptors
| Topological Polar Surface Area | 0 Ų💻 Computed |
| H-Bond Donors | 0 count💻 Computed |
| H-Bond Acceptors | 1 count💻 Computed |
| Rotatable Bonds | 1 count💻 Computed |
| Aromatic Rings | 0 count💻 Computed |
| Molar Refractivity | 28.635 cm^3/mol📊 OPERA |
| Polarizability | 11.352 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.
