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Volumn 126, Issue 10, 2004, Pages 3310-3320

Peroxovanadate Imidazole Complexes as Catalysts for Olefin Epoxidation: Density Functional Study of Dynamics, 51V NMR Chemical Shifts, and Mechanism

Author keywords

[No Author keywords available]

Indexed keywords

COMPLEXATION; COMPUTER SIMULATION; MOLECULAR DYNAMICS; PROBABILITY DENSITY FUNCTION; SOLUTIONS;

EID: 84961983976     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja039436f     Document Type: Article
Times cited : (78)

References (110)
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    • Sigel, H., Sigel, A., Eds.; Marcel Dekker: New York
    • (a) Crans, D. C. In Metal Ions in Biological Systems; Sigel, H., Sigel, A., Eds.; Marcel Dekker: New York, 1995; Vol. 31, pp 147-210.
    • (1995) Metal Ions in Biological Systems , vol.31 , pp. 147-210
    • Crans, D.C.1
  • 34
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    • Perdew, J. P. Phys. Rev. B 1986, 33, 8822-8824. Perdew, J. P. Phys. Rev. B 1986, 34, 7406.
    • (1986) Phys. Rev. B , vol.33 , pp. 8822-8824
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    • Perdew, J. P. Phys. Rev. B 1986, 33, 8822-8824. Perdew, J. P. Phys. Rev. B 1986, 34, 7406.
    • (1986) Phys. Rev. B , vol.34 , pp. 7406
    • Perdew, J.P.1
  • 51
    • 84962373526 scopus 로고    scopus 로고
    • note
    • s symmetry with θ = 180°, which is a transition state 0.7 kcal/mol above 1.
  • 55
    • 84962395915 scopus 로고    scopus 로고
    • note
    • 2) bond length: On going from the gas phase into aqueous solution, this bond contracts from 2.279 to 2.017 Å, that is, by 0.26 Å, at the BP86 level (present work), and from 2.394 to 2.082 Å, that is, by 0.31 Å, with the BLYP functional (ref 19a).
  • 58
    • 84962363421 scopus 로고    scopus 로고
    • note
    • From a rigid scan with all other parameters fixed to the values in the CP-opt geometry of 1.
  • 59
    • 0000067795 scopus 로고
    • Jameson, C. J.; Rehder, D.; Hoch, M. J. Am. Chem. Soc. 1987, 109, 2589-2594. This empirical value has been qualitatively reproduced using theoretical methods similar to those employed in the present study, see: Godbout, N.; Oldfield, E. J. Am. Chem. Soc. 1997, 119, 8065-8069.
    • (1987) J. Am. Chem. Soc. , vol.109 , pp. 2589-2594
    • Jameson, C.J.1    Rehder, D.2    Hoch, M.3
  • 60
    • 0030794888 scopus 로고    scopus 로고
    • Jameson, C. J.; Rehder, D.; Hoch, M. J. Am. Chem. Soc. 1987, 109, 2589-2594. This empirical value has been qualitatively reproduced using theoretical methods similar to those employed in the present study, see: Godbout, N.; Oldfield, E. J. Am. Chem. Soc. 1997, 119, 8065-8069.
    • (1997) J. Am. Chem. Soc. , vol.119 , pp. 8065-8069
    • Godbout, N.1    Oldfield, E.2
  • 80
    • 84962377664 scopus 로고    scopus 로고
    • note
    • - + Im) is computed to be only 10.7 kcal/mol at the BP86/AE1 level. It has been noted in part 1, however, that in aqueous solution the bonding between V and Im is substantially reinforced (see V-N bond lengths in Table 1).
  • 85
    • 84962345787 scopus 로고    scopus 로고
    • note
    • The barrier for transfer of the oxo ligand O1 to the olefin is much higher, ca. 60 kcal/mol (BP86/AE1 + ZPE level).
  • 86
    • 84962350916 scopus 로고    scopus 로고
    • note
    • The product of this process, hydroperoxy complex 7, is a stable minimum, unlike the elusive hydroperoxy complex 4, which would have a higher coordination number (see Scheme 2).
  • 91
    • 84962430891 scopus 로고    scopus 로고
    • note
    • We explored a few other possibilities, such as proton transfer from the hydroperoxo to the hydroxo group in 7, but no transition state lower in energy than TS79 was found.
  • 92
    • 84962450615 scopus 로고    scopus 로고
    • note
    • 2, 22 kcal/mol). Elimination of ozone is indicated to be even less favorable.
  • 93
    • 84962412292 scopus 로고    scopus 로고
    • note
    • For Mo species following the insertion pathway, an additional reaction channel would be accessible, elimination of acetaldehyde rather than the epoxide from the metalla-oxalane (cf., ref 45e); we did not explore this possibility for 8, as its formation is strongly disfavored in the first place.
  • 105


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.