Butanol

Butanol (also called butyl alcohol) is a four-carbon alcohol with a formula of C₄H₉OH, which occurs in five isomeric structures (four structural isomers), from a straight-chain primary alcohol to a branched-chain tertiary alcohol;^[1] all are a butyl or isobutyl group linked to a hydroxyl group (sometimes represented as BuOH, 1-BuOH, i-BuOH, and t-BuOH). These are 1-butanol, two stereoisomers of sec-butyl alcohol, isobutanol and tert-butyl alcohol. Butanol is primarily used as a solvent and as an intermediate in chemical synthesis, and may be used as a fuel. Biologically produced butanol is called biobutanol, which may be n-butanol or isobutanol.