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Volumn 126, Issue 10, 2004, Pages 3332-3348

Theoretical Study of the Cp2Zr-Catalyzed Hydrosilylation of Ethylene. Reaction Mechanism Including New σ-Bond Activation

Author keywords

[No Author keywords available]

Indexed keywords

ACTIVATION ENERGY; CATALYSIS; CHEMICAL BONDS; REACTION KINETICS; SILICON COMPOUNDS;

EID: 1642367216     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0304345     Document Type: Article
Times cited : (105)

References (63)
  • 1
    • 0001418043 scopus 로고
    • Patai, S., Rappoport, Z., Eds.; John Wiley & Sons Ltd.: New York
    • (a) Tilley, T. D. In The Chemistry of Organic Silicon Compounds; Patai, S., Rappoport, Z., Eds.; John Wiley & Sons Ltd.: New York, 1989; p 1415.
    • (1989) The Chemistry of Organic Silicon Compounds , pp. 1415
    • Tilley, T.D.1
  • 2
    • 0000829913 scopus 로고
    • Patai, S., Rappoport, Z., Eds.; John Wiley & Sons Ltd.: New York
    • (b) Ojima, I. In The Chemistry of Organic Silicon Compounds; Patai, S., Rappoport, Z., Eds.; John Wiley & Sons Ltd.: New York, 1989; p 1479.
    • (1989) The Chemistry of Organic Silicon Compounds , pp. 1479
    • Ojima, I.1
  • 20
    • 37049068611 scopus 로고
    • Vinylsilane is produced from alkenes through the C-H σ-bond activation of alkenes followed by reductive elimination between vinyl and silyl groups.11b This means that the formation of vinylsilane does not necessarily provide evidence of the modified Chalk-Harrod mechanism. (b) Ruiz, J.; Bentz, P. O.; Mann, B. E.; Spencer, C. M.; Taylor, B. F.; Maitlis, P. M. J. Chem. Soc., Dalton Trans. 1987, 2709.
    • (1987) J. Chem. Soc., Dalton Trans. , pp. 2709
    • Ruiz, J.1    Bentz, P.O.2    Mann, B.E.3    Spencer, C.M.4    Taylor, B.F.5    Maitlis, P.M.6
  • 47
    • 0000853328 scopus 로고    scopus 로고
    • and references therein
    • The exponent (ζ = 0.50) of the 3d-polarization function of Si was taken from the many works of the Schaefer group. See, for instance: Brinkmann, N. R.; Tschumper, G. S.; Schaefer, H. F. J. Chem. Phys. 1999, 110, 6240 and references therein.
    • (1999) J. Chem. Phys. , vol.110 , pp. 6240
    • Brinkmann, N.R.1    Tschumper, G.S.2    Schaefer, H.F.3
  • 48
    • 1642363892 scopus 로고    scopus 로고
    • note
    • In solution, translation and rotation movements are not completely free but are highly suppressed. This means that the thermal energy and the entropy deviate very much from the true values if we treat substrates as ideal gas. However, when we estimate the thermal energy and the entropy by considering only vibration movements, the values are underestimated, because translation and rotation movements are not completely suppressed but somewhat contribute to the thermal energy and the entropy in solution; for instance, the translation movement considerably occurs as shown by the rapid diffusion rate, and the rotation movement somewhat occurs in nonpolar solvent. Also, the solvation structure changes upon formation of the precursor complex, which contributes to the entropy effect. Unfortunately, we do not know how to estimate partition functions of translation and rotation movements in solution. One of the reasonable ways is to estimate thermal energy and entropy with and without translation and rotation movements and to compare free energy changes evaluated by two methods, as described in the text.
  • 57
    • 1642388315 scopus 로고    scopus 로고
    • note
    • The effective core potentials and basis sets of the same quality as that of BS-I were used in the geometry optimization with the DFT(B3LYP) method; core electrons of Pt, P, and Cl atoms were replaced with the ECPs, and their valence electrons were represented with (311/311/21) and (21/ 21/1) sets, respectively.26-28 Electron populations were evaluated with the same ECPs and better basis sets, (541/541/111) set for Pt, while the same basis sets were used for Cl and p.26-28.31
  • 61
    • 1642303770 scopus 로고    scopus 로고
    • note
    • 4 and the Zr center and as a result a very small vibration frequency between them.
  • 62
    • 1642350820 scopus 로고    scopus 로고
    • note
    • (b) The translation and rotation movements are not completely suppressed but not completely free in the real solvent system. Thus, the true ΔG°‡ value is intermediate between these two values, -1.7 and 11.6 kcal/mol, where the latter value was estimated under the assumption that translation and rotation movements are completely free.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.