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Encyclopedia Britannica - Main :: TUM-VAN |
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VALERIC ACID, or VALERIANIC ACID , C4H9CO2H, an organic acid belonging to the fatty acid series , which exists in four isomeric forms, one of which contains an asymmetric
Ordinary valeric acid (baldrianic acid) is a mixture of isovaleric acid or isopropylacetic acid, (CH3)2CHCH2CO211,andoptically active methylethylacetic acid, (CH3) (C2HS)CHCO2H, which occur free or as esters in the vegetable and animal kingdoms, chiefly in the roots of Angelica archangelica and Valeriana officinalis. It may be extracted by boiling with water or soda. A similar product isobtained by oxidizing fermentation amyl alcohol
touch . Potassium permanganate oxidizes it to f3-oxyisovaleric acid (CH3)2C(OH)CH2CO2H, whilst nitric acid gives, among other products, dinitropropane, (CH3)2C(NO2)2. The acid has been synthesized, as has also the inactive form of methylethylacetic acid; this 'modification is split into its optical
antipodes by crystallization of its brucine salt
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