Iso butyric acid, also known as 2-methylpropanoic acid, is a with structural formula (3)2-CH-. It is found in the free state in ( siliqua) and in the root of dulcis, and as an ethyl in croton oil.
Isobutyric acid is an of n-; they have the same chemical formula 48 2 but a different structure.
Isobutyric acid may be artificially prepared by the of with , by the of with and , or by the action of on . It is a liquid of somewhat unpleasant smell, boiling at 155 °C. Its specific gravity is 0.9697 (0 °C) and is 4.84 (20 °C). Heated with solution to 140 °C, it gives and . Alkaline oxidizes it to α-hydroxyisobutyric acid, (CH3)2-C(OH)-COOH. Its are more soluble in water than those of .