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Mechanistic model of the 2-picolylazide (1) involved, Cu(OAc)2-accelerated CuAAC reaction. Structure I could be generated via the OHC sequence depicted in Figure 17 in an induction period. Orange: +1 oxidation state; purple: +3 oxidation state. Formal charges on individual atoms are noted. CuA – oxidation state is undefined. See text.
