Lewis acid/Lewis base interactions and hydrogen bonds account for the cooperative binding of two molecules of benzylamine to the chiral diboronate 1. Exclusive formation of the 1:2 complex of the Lewis acid 1 and benzylamine is evident in the NMR spectrum, which implies that the binding of the first molecule provides a suitable binding site for the second amine molecule.
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Nozaki et al. (1995) studied this question.
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