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(A) Observed isotopic enrichment of triazolide 6. (B) No isotopic enrichment of acetylide 2 observed. (C) No isotopic enrichment of triazolide 4 observed. Bn = Benzyl. Ar = p-tBuPh. (NHC) = 1,3-bis(2,6-diisopropyl)phenyl-4,5-dihydroimidazol-2-ylidene. rt = room temperature.
