4,4'-Oxybis(butan-1-ol) (CAS No. 3403-82-5) is a diol organic compound with the molecular formula C₈H₁₈O₃. Its structure consists of two 1-butanol units connected by an ether bond (-O-), forming a symmetric linear molecule. It is typically produced via butanol condensation, where intermolecular dehydration occurs under the action of an acidic catalyst (such as sulfuric acid) or a dehydrating agent to form the ether bond, followed by purification to obtain a high-purity product. Due to its two hydroxyl groups, it exhibits good hydrophilicity and reactivity, and is widely used in drug synthesis as an intermediate or solvent. For example, it is employed in the preparation of polymers, surfactants, and pharmaceutical impurity reference standards. Its stability and low toxicity make it an ideal choice for both laboratory and industrial applications.