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Volumn 316, Issue 5821, 2007, Pages 85-88

Acid catalysis in basic solution: A supramolecular host promotes orthoformate hydrolysis

Author keywords

[No Author keywords available]

Indexed keywords

ACID; ALKALI;

EID: 34147102286     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1138748     Document Type: Article
Times cited : (682)

References (40)
  • 27
    • 34147126797 scopus 로고    scopus 로고
    • 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.
    • 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.
  • 28
    • 34147132650 scopus 로고    scopus 로고
    • The exchange rates were measured at pD = 13.0 and 500 mM KCl to ensure uniform ionic strength.
    • The exchange rates were measured at pD = 13.0 and 500 mM KCl to ensure uniform ionic strength.
  • 30
    • 34147095103 scopus 로고    scopus 로고
    • 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.
    • 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.
  • 32
    • 34147105866 scopus 로고    scopus 로고
    • 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.
    • 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.
  • 33
    • 34147139286 scopus 로고    scopus 로고
    • 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).
    • 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).
  • 36
    • 34147162641 scopus 로고    scopus 로고
    • 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
    • -). However, at lower pH, the formate ester product is stable and is the exclusive product.
  • 37
    • 34147135949 scopus 로고    scopus 로고
    • 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.
    • 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.
  • 40
    • 34147120005 scopus 로고    scopus 로고
    • 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
    • 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.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.