Isobutyric Acid
Aroma Chemical Top Note CAS 79-31-2
A sharp sour acidic note with a pungent cheesy buttery character and a faint fruity edge. Used in trace amounts it lends a fermented dairy realism to gourmand and fruity accords.
Odor profile
| Note | Top Note |
| Descriptor 1 | Acidic |
| Descriptor 2 | Pungent |
| Descriptor 3 | Fruity |
| Odor Impact1 | 600 |
| Tenacity1 | 8 h |
1 Source: PerfumersWorld
Identification
| CAS Number | 79-31-2 |
| INCI Name | Isobutyric acid |
| Category | Aroma Chemical |
| Formula | C4H8O2 |
| Mol. Weight | 88.11 |
| IUPAC Name | 2-methylpropanoic acid |
| InChIKey | KQNPFQTWMSNSAP-UHFFFAOYSA-N |
Synonyms
iso butanoic acid, dimethyl acetic acid, methyl propanoic acid, alpha- methyl propanoic acid, methyl propionic acid, alpha- methyl propionic acid, methylpropanoic acid, iso propyl formic acid
Physical and chemical data
| Boiling Point | 153.9 °C |
| Melting Point | -46.1 °C |
| Flash Point | 55.6 °C |
| Density | 0.949 |
| Refractive Index | 1.393 |
| Vapor Pressure | 1.81 [mmHg] |
| LogP | 0.8 |
| Solubility | Sol in 6 parts of water; miscible with alcohol, chloroform, and ether. |
| Appearance | Isobutyric acid appears as a colorless liquid with a light odor of rancid butter. Corrosive to metals and tissue. |
All figures on this page are guide values collected from public reference works and supplier declarations. They differ between batches, origins and qualities. The data sheet of your own supplier is always the authoritative document for the material you actually use.