3-Chloropropyl isocyanate is an organic compound classified as an isocyanate, featuring a propyl chain with a chlorine substituent at the third carbon position and an isocyanate functional group (-N=C=O). This compound is of significant interest in synthetic organic chemistry due to its reactivity, particularly in the formation of urethanes and other nitrogen-containing compounds. 3-Chloropropyl isocyanate can participate in nucleophilic addition reactions with various nucleophiles, including alcohols and amines, making it a valuable intermediate for producing diverse chemical entities, including pharmaceuticals, agrochemicals, and polymer materials.