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N-Butanol or N-Butyl Alcohol (sometimes called biobutanol when produced biologically)^[6] is a primary alcohol with a 4-carbon structure and the molecular formula C₄H₁₀O. It is one of the group of "fusel alcohols" (from the German for "bad "), which have more than two carbon atoms and have significant solubility in water.
 
N-butanol is an intermediate in the production of butyl acrylate, butyl acetate, dibutyl phthalate, dibutyl sebacate and other butyl esters,^[12][13] butyl ethers such as ethylene glycol monobutyl ether, di- and triethylene glycol monobutyl ether and the corresponding butyl ether acetates. Other industrial uses include the manufacture of pharmaceuticals, polymers, pyroxylin plastics, herbicide esters (e.g., 2,4-D, 2,4,5-T)^[14] and butyl xanthate. It is also used as a diluent/reactant in the manufacture of urea–formaldehyde and melamine–formaldehyde resins.
 
N-Butanol is used as an ingredient in perfumes and as a solvent for the extraction of essential oils.^[12]n-Butanol is also used as an extractant in the manufacture of antibiotics, hormones, and vitamins;^[12][13] a solvent for paints, coatings, natural resins, gums, synthetic resins, dyes, alkaloids, and camphor.^[12][13] Other miscellaneous applications of n-butanol are as a swelling agent in textiles, as a component of brake fluids, cleaning formulations, degreasers, and repellents;^[8] and as a component of ore floation agents,^[14] and of wood-treating systems