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- W1988616077 abstract "A high yielding (93%), regiospecific synthesis of cis(4,4′)-di(carbomethoxybenzo)-30-crown-10 (1c) is reported. The derived crown ether diol 1d was converted to pyridyl cryptand 12 in 44% yield by reaction with pyridine-2,6-dicarbonyl chloride. Binding of two different 4,4′-bipyridinium (paraquat) species (3) and 2,2′-bipyridinium (diquat) 4 by 12 was explored via 1H NMR spectroscopy, NOE experiments, mass spectrometry, X-ray crystallographic analyses, and isothermal titration calorimetry. Cryptand 12 exhibits the highest association constant for diquat ever reported (Ka = 1.9 × 106 M−1) and very high association constants for paraquats (Ka > 105 M−1) in acetone at 22 °C. The binding constant of diquat 4 by cryptand 12 is nearly 6-times higher than any other reported host." @default.
- W1988616077 created "2016-06-24" @default.
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- W1988616077 date "2008-10-24" @default.
- W1988616077 modified "2023-10-07" @default.
- W1988616077 title "High-Yielding, Regiospecific Synthesis of <i>cis</i>(4,4′)-Di(carbomethoxybenzo)-30-crown-10, Its Conversion to a Pyridyl Cryptand and Strong Complexation of 2,2′- and 4,4′-Bipyridinium Derivatives" @default.
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- W1988616077 doi "https://doi.org/10.1021/jo801886x" @default.
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