CH3CH2CH2CH2O

CH3CH2CH2CH2O, more commonly known as n-butanol or 1-butanol, is a four-carbon alcohol with the chemical formula C4H10O. It is a linear, primary alcohol, meaning the hydroxyl group (-OH) is attached to a primary carbon atom. At room temperature, n-butanol is a colorless, flammable liquid with a characteristic banana-like odor. It is moderately soluble in water and miscible with most organic solvents.

N-butanol is produced industrially through several processes, including the oxo process (hydroformylation of propylene followed by hydrogenation) and fermentation by Clostridium bacteria. Historically, it was also produced from acetylene. Its primary applications include its use as a solvent for paints, lacquers, and resins, and as a chemical intermediate in the production of other compounds such as butyl acetate, butyl acrylate, and butyl ethers. It also finds use as an extraction solvent and as an additive in aviation gasoline. Due to its flammability, appropriate safety precautions are necessary when handling n-butanol.