Scheme 1. Cu nitrenoid synthesis from (EMindL)Cu(N2) (1) through intermittency of an observable, diamagnetic azide adduct (EMindL)Cu(N3R), isolable for (EMindL)Cu(N3Ad) (2). For arylazides, extrusion of N2 affords the corresponding Cu nitrenoid product (EMindL)Cu[N(C6H4OtBu)] (3-OtBu) or (EMindL)Cu[N(C6H4tBu)] (3-tBu).40.
