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(Top) Decay of 1 (monitored at 820 nm; initial concentration 1.0 mM) and formation of 2 (monitored at 720 nm) in the presence of 10 equiv. HPyr+ in CH3CN at 10 °C. (Bottom) Plots of kobs(720) vs. added [HPyr+] for the conversion of 1.0 mM 1 to 2 in CH3CN at 10 °C. Error bars show one standard deviation of kobs from at least three independent measurements.
