Tosyl azide is a reagent used in organic synthesis.

[1] It is also used as a nitrene source and as a substrate for [3+2] cycloaddition reactions.

[1] Tosyl azide can be prepared by the reaction of tosyl chloride with sodium azide in aqueous acetone.

[2] Tosyl azide is one of the most stable azide compounds but is still regarded as a potential explosive and should be carefully stored, while particular caution is vital for all reactions in which it is heated at or above 100 °C.

The initial temperature of the explosive decomposition is about 120 °C.