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Yields of individual imines were calculated from the overall mass recovery of the mixture and 1H NMR spectra integration data. Isolation of individual imines would have likely altered the distribution of the products and was not performed When H2O was slowly added to this diluted mixture of imines, slow and incomplete precipitation occurred, yielding mixtures of imines in both the precipitate and the mother liquor Imine mixtures precipitated from EtOH-H2O exhibit a certain degree of kinetic stability after re-dissolution in MeCN: mixture obtained in experiment shown in Scheme 2 (bottom) did not change in composition even after 7 days in MeCN solution at 25 °C. Equilibration into the random mixture of products was achieved only after heating in MeCN at reflux for 24 h. This kinetic stability is perhaps unsurprising, as rapid imine exchange often requires catalysis by free anilines. See, for example
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Concentrations higher than 209 mM were not studied because they led to the formation of undesired non-imine products. Most significant of these (29%) was the acetal formed between aldehyde C and EtOH which was used as the solvent
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