A synthetic host, which can easily be assembled starting from urea and benzil, selectively binds resorcinol by hydrogen bonding and r-stacking.Exploring the potentialities of u-r interactions and hydrogen bonding in order to attain strong and selective binding is currently an area of intense interest in hostguest chemistry.Rebek' and Hamilton2 have shown that a single aromatic surface can significantly improve the complexation of a guest in a hydrogen bonding receptor.@
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Sijbesma et al. (1991) studied this question.