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. Author manuscript; available in PMC: 2014 Apr 26.
Published in final edited form as: Science. 2013 Apr 4;340(6131):457–460. doi: 10.1126/science.1229506

Fig. 4.

Fig. 4

(A) Mechanistic rationale for the isotopic enrichment of triazolide 6. (B) Rapidly interconverting isomers of intermediate 9. (C) Proposed catalytic model for the CuAAC with two copper atoms. Bn = Benzyl. Ar = p-tBuPh. NHC = 1,3-bis(2,6-diisopropyl)phenyl-4,5-dihydroimidazol-2-ylidene.