Isocyanobenzene is primarily used as a reactive intermediate in organic synthesis. It participates in cycloaddition reactions, such as [3+2] and [4+1] processes, to construct nitrogen-containing heterocycles like oxazoles, triazoles, and indoles. Its strong dipole character makes it valuable in generating five-membered rings through 1,3-dipolar cycloadditions. It is also employed in the preparation of pharmaceuticals and agrochemicals where aromatic nitrile or isocyanide functionalities are required. Due to its high reactivity and tendency to polymerize, it is typically generated and used in situ. Safety precautions are essential due to its toxicity and instability.