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Volumn 71, Issue 16, 2006, Pages 5959-5968

Primary semiclassical kinetic hydrogen isotope effects in identity carbon-to-carbon proton- and hydride-transfer reactions, an ab initio and DFT computational study

Author keywords

[No Author keywords available]

Indexed keywords

CHEMICALS; COMPUTER SIMULATION; ELECTRON TUNNELING; ENTHALPY; GEOMETRY; HYDRIDES; ISOTOPES; REACTION KINETICS;

EID: 33746891931     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo0606296     Document Type: Article
Times cited : (15)

References (70)
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    • Caldin, E. F., Gold, V., Eds.; Chapman and Hall: London, Chapter 8
    • (a) A discussion with pertinent references is given by More O'Ferrall, R. In Proton-Transfer Reactions; Caldin, E. F., Gold, V., Eds.; Chapman and Hall: London, 1975; Chapter 8, pp 233-256.
    • (1975) Proton-Transfer Reactions , pp. 233-256
    • More O'Ferrall, R.1
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    • Motell, Boone, and Fink have shown that even when the partial bond force constants are far from equal, a large interaction force constant for the motion involving all three bodies in the three-center ts can preserve large KIEs; see: Motell, E. L.; Fink, W. H. J. Am. Chem. Soc. 1976, 98, 7152.
    • (1976) J. Am. Chem. Soc. , vol.98 , pp. 7152
    • Motell, E.L.1    Fink, W.H.2
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    • Caldin, E. F., Gold, V., Eds.; Chapman and Hall: London, Chapter 8
    • (b) More O'Ferrall, R. In Proton-Transfer Reactions; Caldin, E. F., Gold, V., Eds.; Chapman and Hall: London, 1975; Chapter 8, pp 236-241.
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    • Reference 8, pp 241-242
    • (c) Reference 8, pp 241-242.
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    • Reference 1b, pp 594-595
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    • Bell's tunneling correction was also applied; see: Bell, R. P. Trans. Farad. Soc. 1959, 55, 1.
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  • 25
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    • John Wiley and Sons: New York
    • See also ref 8 and ref 6, pp 270-289. For an early and thorough discussion of a KIE calculation using the force-field method see: Wiberg, K. B. Physical Organic Chemistry; John Wiley and Sons: New York, 1963; pp 351-359.
    • (1963) Physical Organic Chemistry , pp. 351-359
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    • Wavefunction, Inc., 18401 Von Karman Avenue, Suite 370, Irvine. CA 92612.
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    • note
    • 25 were not used in the KIE calculations. We estimate that the effects of scaling would be small on the partition function contributions to the KIE values. The use of scaled ZPVE corrections lowers the calculated KIE values slightly as the recommended scaling factors are less than one. The effect is greatest for the HF/6-311+G** KIEs since that scaling factor is the smallest of the three.
  • 47
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    • note
    • See paragraph concerning Supporting Information at the end of this paper. Electronic energies, zero-point vibrational energies, ts imaginary frequency values, and Cartesian coordinates are reported therein.
  • 48
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    • note
    • Natural population analysis (NPA) charges were obtained for the optimized MP2/6-311+G** and B3LYP/6-311++G** transition state structures.
  • 54
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    • Reference 1a, page 39
    • Reference 1a, page 39.
  • 55
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    • Unpublished results
    • Gronert, S.; Fagin, A. E. Unpublished results. Experimental KIE values for activation-controlled, gas-phase E2 eliminations give primary KIEs (corrected for secondary effects), which are satisfactorily reproduced by computation at the HF/6-31+G* level.
    • Gronert, S.1    Fagin, A.E.2
  • 56
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    • Barlow, S. E.; Dang, T. T.; Bierbaum, V. M. J. Am. Chem. Soc. 1990, 112, 6832. In reality the gas-phase proton transfer between alcohols and their conjugate bases is probably barrier-free with an isotope effect similar to that for hydrogen bond formation. Computationally a transition state can be found, and a computational primary KIE is reported in Table 3.
    • (1990) J. Am. Chem. Soc. , vol.112 , pp. 6832
    • Barlow, S.E.1    Dang, T.T.2    Bierbaum, V.M.3
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    • note
    • 23 Almost identical frequencies are found at the MP2/6-311+G** and B3LYP/6-311++G** levels in the Gaussian output.
  • 60
    • 33746911102 scopus 로고    scopus 로고
    • note
    • We note that hydride transfer from the haloforms to the corresponding trihalomethyl cations has an eclipsed ts for fluoroform at both MP2 and B3LYP levels. Likewise the chloroform ts is eclipsed at B3LYP.
  • 62
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    • Prakash, G. K. S., Schleyer, P. v. R., Eds.; Wiley-Interscience: New York, Chapter 3
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.