“…For metal carbene N À H insertions, a-diazocarbonyl compounds normally serve as metal carbene precursors, and Cu(I) and Rh(II) complexes are the most widely used catalysts. While for hydroamination of alkynes, transition metal complexes of Ti, [8] Pd, [9] Pt, [10] Ru, [11] Au, [12] Rh, [13] Ir, [14] La, [7f,15] Zn and Cd, [16] Hg, [17] Zr [18] and Ac [19] have been widely utilized. Although it is less common, copper-catalyzed hydroamination of alkynes has also been reported.…”