C18H39N

C18H39N is an organic compound commonly known as octadecylamine or stearylamine. It is a long-chain primary amine with the formula CH3-(CH2)17-NH2, consisting of an 18-carbon aliphatic chain bearing a terminal amino group. This structure gives the molecule both hydrophobic and hydrophilic character, enabling diverse applications.

Octadecylamine is typically produced by hydrogenation or selective reduction of octadecenitrile or other nitrile precursors derived from stearic-type feedstocks. It is a waxy, white to pale yellow solid at room temperature and is soluble in many organic solvents but only sparingly soluble in water.

In industry, C18H39N serves as a versatile building block. It is used as a surfactant and as a precursor to quaternary ammonium salts, which find applications in detergents, disinfection, and phase-transfer catalysis. It also appears in lubricant formulations, polymer and epoxy resin chemistry as a curing agent or modifier, and as a corrosion inhibitor for steel in acidic environments.

Safety and handling considerations are important: long-chain amines can be irritants to skin and eyes and may pose inhalation hazards. Appropriate protective equipment and good ventilation are recommended. The compound can react with acids to form corresponding ammonium salts, and it can be converted into more functional derivatives for specialized applications.

Related long-chain amines include other stearyl- or cetyl-based derivatives, which share similar physical properties and broad utility in chemical synthesis and material science.