With halide acceptors it gives nitrosonium salts, and synthesis of nitrosonium tetrachloroferrate is typically performed in liquid NOCl:[8] In a related reaction, sulfuric acid gives nitrosylsulfuric acid, the mixed acid anhydride of nitrous and sulfuric acid: NOCl reacts with silver thiocyanate to give silver chloride and the pseudohalogen nitrosyl thiocyanate: Similarly, it reacts with silver cyanide to give nitrosyl cyanide.

In the case of propylene oxide, the addition proceeds with high regiochemistry:[14] It converts amides to N-nitroso derivatives.

For example, aziridine reacts with NOCl to give ethene, nitrous oxide and hydrogen chloride.

NOCl and cyclohexane react photochemically to give cyclohexanone oxime hydrochloride.

This process exploits the tendency of NOCl to undergo photodissociation into NO and Cl radicals.