Stimulating reactions: The anion-induced synthesis of a new class of 2,6-diamidopyridine–bipyrrole macrocyclic receptors that undergo combinatorial selection as a result of their interaction with anionic guests has been demonstrated (see picture of the interaction of bipyrrole fragments with a sulfate ion). The outcome of this stimulus-driven reaction bears analogy to recent macrocycle-forming strategies based on dynamic combinatorial processes.
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Katayev et al. (2005) studied this question.
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