4-Fluorophenyl isothiocyanate is a reactive organosulfur compound widely used as a key intermediate in pharmaceutical synthesis and peptide modification. This moisture-sensitive compound has a density of 1.25 g/cm³ at 25°C and boiling point of 193°C (lit.). It exhibits characteristic isothiocyanate reactivity, readily forming thiourea derivatives with amines. The material should be stored under inert atmosphere (argon/nitrogen) at 2-8°C, protected from light. Safety precautions are essential due to its lachrymatory properties and potential skin/eye irritation (GHS Category 2). Its fluorine substitution enhances the electron-withdrawing nature of the phenyl ring, making it particularly useful for synthesizing fluorinated bioactive molecules.
