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A) Reaction between 1a and 2a. B) X-ray single crystal structure of 3aa. C) Kinetic analysis; conditions: [1a]0 = 2.5 mM, [2a]0 = 2.5 mM, CD3CN, 25 °C; concentrations monitored by 1H NMR with spectra recorded every 60 s; kobs (2nd order): 3.68 ± 0.03 M−1 s−1
