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Volumn 129, Issue 4, 2007, Pages 924-933

Hydrogenation of simple aromatic molecules: A computational study of the mechanism

Author keywords

[No Author keywords available]

Indexed keywords

AROMATIC MOLECULES; BELL EVANS POLANYI PRINCIPLE; HYDROGEN FLUORIDE; QUANTUM CHEMISTRY;

EID: 33846636504     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja066251a     Document Type: Article
Times cited : (47)

References (55)
  • 2
    • 0003445429 scopus 로고    scopus 로고
    • Jacobsen, E. N, Pfaltz, A, Yamamoto, H, Eds, Springer: Berlin
    • (b) Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Comprehensive Asymmetric Catalysis; Springer: Berlin, 1999; Vol. I.
    • (1999) Comprehensive Asymmetric Catalysis , vol.1
  • 5
    • 0028568063 scopus 로고
    • For general reviews on hydrogenases, see: a
    • For general reviews on hydrogenases, see: (a) Albracht, S. P. J. Biochim. Biophys. Acta 1994, 1188, 167.
    • (1994) Biochim. Biophys. Acta , vol.1188 , pp. 167
    • Albracht, S.P.J.1
  • 27
    • 33846611988 scopus 로고    scopus 로고
    • Frisch, M. J., et al. Gaussian 03, revision B.03; Gaussian, Inc.: Pittsburgh, PA, 2003.
    • Frisch, M. J., et al. Gaussian 03, revision B.03; Gaussian, Inc.: Pittsburgh, PA, 2003.
  • 39
    • 33846639687 scopus 로고    scopus 로고
    • The fact that such catalysis leads to an increased barrier in most cases of course implies that in reality the reaction is not likely to utilize the catalyst in this way but would proceed either in an uncatalyzed manner or with the catalyst in almost a spectator role. Nonetheless, the lower barriers observed in some cases demonstrate the subtleties in such catalytic reactions. The purpose of our calculations is to illustrate what happens in a constrained situation so as to indicate the fundamental principles at work and, thus, provide insights into the design of potential catalysts for such reactions
    • The fact that such catalysis leads to an increased barrier in most cases of course implies that in reality the reaction is not likely to utilize the catalyst in this way but would proceed either in an uncatalyzed manner or with the "catalyst" in almost a spectator role. Nonetheless, the lower barriers observed in some cases demonstrate the subtleties in such catalytic reactions. The purpose of our calculations is to illustrate what happens in a constrained situation so as to indicate the fundamental principles at work and, thus, provide insights into the design of potential catalysts for such reactions.
  • 42
  • 45
    • 33846595290 scopus 로고    scopus 로고
    • In a simplified treatment, the 1,2-hydrogenation may be regarded as a [2, 2]-type reaction, which is also symmetry forbidden
    • In a simplified treatment, the 1,2-hydrogenation may be regarded as a [2 + 2]-type reaction, which is also symmetry forbidden.
  • 46
    • 33846608724 scopus 로고    scopus 로고
    • -1, respectively.
    • -1, respectively.
  • 47
    • 33846594371 scopus 로고    scopus 로고
    • 298 values of benzene, 1,3-cyclohexadiene, and 1,4-cyclohexadiene from the NIST Chemistry Webbook (Linstrom P. J., Mallard W. G., Eds. NIST Chemistry WebBook, NIST Standard Reference Database Number 69; National Institute of Standards and Technology: Gaithersburg, MD 20899, June 2005 (http://webbook.nist.gov)).
    • 298 values of benzene, 1,3-cyclohexadiene, and 1,4-cyclohexadiene from the NIST Chemistry Webbook (Linstrom P. J., Mallard W. G., Eds. NIST Chemistry WebBook, NIST Standard Reference Database Number 69; National Institute of Standards and Technology: Gaithersburg, MD 20899, June 2005 (http://webbook.nist.gov)).
  • 49
    • 33846639238 scopus 로고    scopus 로고
    • We find that this effect is quite general: an additional molecule of H2 substantially lowers the barrier for the uncatalyzed 1,2-hydrogenation of ethene and several other unsaturated substrates
    • 2 substantially lowers the barrier for the uncatalyzed 1,2-hydrogenation of ethene and several other unsaturated substrates.
  • 50
    • 33846647515 scopus 로고    scopus 로고
    • We have carried out additional calculations on structures corresponding to HF complexed to the benzene or H2 moieties of the TS of Figure 8, and the derived barrier is not significantly affected by the presence of HF; i.e, the HF molecule is effectively a spectator in these cases. The results in Figure 7 demonstrate the principles at work when the acid catalysts are more actively involved
    • 2 moieties of the TS of Figure 8, and the derived barrier is not significantly affected by the presence of HF; i.e., the HF molecule is effectively a spectator in these cases. The results in Figure 7 demonstrate the principles at work when the acid catalysts are more actively involved.
  • 51
    • 33846586491 scopus 로고    scopus 로고
    • 2 moieties of the uncatalyzed TS of Figure 9 show that the barrier (measured from the reactant complex) is only very slightly lowered from that for the uncatalyzed reaction.
    • 2 moieties of the uncatalyzed TS of Figure 9 show that the barrier (measured from the reactant complex) is only very slightly lowered from that for the uncatalyzed reaction.
  • 52
    • 33846634695 scopus 로고    scopus 로고
    • All proton affinities were computed at the G3(MP2)-RAD level and are taken from ref 8d with the exception of HBr, for which the proton affinity was computed as part of the present study.
    • All proton affinities were computed at the G3(MP2)-RAD level and are taken from ref 8d with the exception of HBr, for which the proton affinity was computed as part of the present study.


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