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34147126797
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6 showed only a singlet at 1.0 parts per million, corresponding to free solvated sodium ions and suggesting that a Na-N,N,N′,N′-tetramethyl-1,2-diaminoethane adduct was not the encapsulated guest.
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6 showed only a singlet at 1.0 parts per million, corresponding to free solvated sodium ions and suggesting that a Na-N,N,N′,N′-tetramethyl-1,2-diaminoethane adduct was not the encapsulated guest.
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34147132650
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The exchange rates were measured at pD = 13.0 and 500 mM KCl to ensure uniform ionic strength.
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The exchange rates were measured at pD = 13.0 and 500 mM KCl to ensure uniform ionic strength.
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30
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34147095103
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The error notation used throughout this paper, for example, k = 0.24(3), means that for the value of k = 0.24 there is a standard uncertainty of 0.03.
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The error notation used throughout this paper, for example, k = 0.24(3), means that for the value of k = 0.24 there is a standard uncertainty of 0.03.
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32
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34147105866
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a of the amine, but because we are unable to observe the neutral amine guest inside of 1, this is more accurately referred to as an effective shift in basicity.
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a of the amine, but because we are unable to observe the neutral amine guest inside of 1, this is more accurately referred to as an effective shift in basicity.
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33
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34147139286
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Examination of crystal structures of 1 with various guests shows that the catechol oxygens are not accessible to a bound guest, thus removing the possibility that hydrogen bonding between 1 and the guest is taking place. Furthermore, examination of NOEs between 1 and the guest reveals strong through-space interactions between the guest and naphthyl protons but not between the guest and catechol protons (fig. S1).
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Examination of crystal structures of 1 with various guests shows that the catechol oxygens are not accessible to a bound guest, thus removing the possibility that hydrogen bonding between 1 and the guest is taking place. Furthermore, examination of NOEs between 1 and the guest reveals strong through-space interactions between the guest and naphthyl protons but not between the guest and catechol protons (fig. S1).
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36
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34147162641
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At high pH, the formate ester product is quickly hydralyzed by OH, to formate ion HCO2, However, at lower pH, the formate ester product is stable and is the exclusive product
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-). However, at lower pH, the formate ester product is stable and is the exclusive product.
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37
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34147135949
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After the initial catalyzed step inside of 1, any of the intermediates can be hydralyzed by either add or base; however, we have not observed any intermediates free in solution.
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After the initial catalyzed step inside of 1, any of the intermediates can be hydralyzed by either add or base; however, we have not observed any intermediates free in solution.
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40
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34147120005
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We gratefully acknowledge financial support from the Director of the Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division (U.S. Department of Energy) under contract DE-AC02-05CH11231 and an NSF predoctoral fellowship to M.D.P. The authors thank D. Leung, G. Lalic, M. Seitz, and C. Hastings for helpful discussions and H. van Halbeek and R. Nunlist for assistance with NMR experiments
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We gratefully acknowledge financial support from the Director of the Office of Energy Research, Office of Basic Energy Sciences, Chemical Sciences Division (U.S. Department of Energy) under contract DE-AC02-05CH11231 and an NSF predoctoral fellowship to M.D.P. The authors thank D. Leung, G. Lalic, M. Seitz, and C. Hastings for helpful discussions and H. van Halbeek and R. Nunlist for assistance with NMR experiments.
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