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1H NMR spectra of 1 after incubation in an ACN/water = 50/50 mixture under various conditions. (A) Spectrum of 1 in the absence of cyclopentene taken at t = 0 h. (B) Spectrum of 1 in the absence of cyclopentene taken at t = 72 h. (C) Spectrum of 1 obtained after incubation in the presence of 1 equiv of cyclopentene for 72 h. For NMR spectroscopy the solvent was removed, and the samples were redissolved in CD3CN.
