A fundamentally useful addition reaction that gives good yields with variety of substrates in ethanol at room temperature on a gram scale.
Markovnikov product, no stereoselectivity with chiral substrates, no ee’s reported with Jacobsen Co-salene as a catalyst (so probably there aren’t any).
The catalysts are either commercial or 1 step to make. The azides can be transformed to triazoles or amines in situ. Works great with safrole.