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  • Title: A new cryptand: synthesis and complexation with paraquat.
    Author: Bryant WS, Jones JW, Mason PE, Guzei I, Rheingold AL, Fronczek FR, Nagvekar DS, Gibson HW.
    Journal: Org Lett; 1999 Oct 07; 1(7):1001-4. PubMed ID: 10825952.
    Abstract:
    [formula: see text] Inspired by folded, nonpseudorotaxane complexes of bis(m-phenylene)-32-crown-10 systems, we synthesized a new bicyclic crown ether containing two 1,3,5-phenylene units linked by three tetra(ethyleneoxy) units. The new cryptand forms a "pseudorotaxane-like" inclusion complex with N,N'-dimethyl-4,4'-bipyridinium bis(hexafluorophosphate) with association constant Ka = 6.1 x 10(4) M-1, 100-fold greater than that of an analogous simple crown ether.
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