CAS 79-31-2: Isobutyric Acid (C4H8O2)
Identity
| CAS Number | 79-31-2 |
| Molecular Formula | C4H8O2 |
| IUPAC Name | 2-methylpropanoic acid |
| Molecular Weight | 88.11 g/mol |
| SMILES | CC(C)C(=O)O |
| Synonyms | 2-methylpropanoic acid, isobutanoic acid, isobutyric acid |
2D Structure
Physical Properties
| Density | 0.969 g/mL at 25°C |
| Boiling Point | 154.5°C |
| Melting Point | -46.1°C |
| Flash Point | 55.0°C |
| Vapor Pressure | 0.13 kPa at 20°C |
| Refractive Index | nD = 1.393 |
| Dielectric Constant | ε = 2.7 |
Safety & GHS Classification
GHS05Irritant
- H314: Causes severe skin burns and eye damage
- H335: May cause respiratory irritation
Storage: Store in tightly sealed containers. Strong rancid odor similar to propionic acid. Corrosive — use PPE.
Material Compatibility Matrix
Plastics
| Material | Rating |
|---|---|
| PTFE | Excellent |
| PVC | Good |
| PE | Good |
| PP | Good |
| PEEK | Excellent |
| PVDF | Good |
Rubbers
| Material | Rating |
|---|---|
| Viton | Fair |
| NBR | Severe Effect |
| EPDM | Good |
| Silicone | Fair |
| FKM | Fair |
Metals
| Material | Rating |
|---|---|
| Stainless 316 | Excellent |
| Aluminum | Poor |
| Copper | Poor |
| Brass | Poor |
Applications
- Ester production for fragrances
- Pharmaceutical intermediate
- Food flavoring agent
- Chemical intermediate for isobutyrates
- Plasticizer production
External References: PubChem