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Volumn 16, Issue 26, 1997, Pages 5811-5815

Structural and NMR studies of indenyl hapticity and rotational barriers in the complexes (η-1-R-indenyl)Ni(PPh3)(X) (R = H, Me; X = Cl, Me)

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EID: 0001474463     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om970715j     Document Type: Article
Times cited : (60)

References (62)
  • 11
    • 11644324798 scopus 로고
    • and references therein
    • (k) O'Connor, J. M.; Casey, C. P. Chem. Rev. 1987, 87, 307 and references therein.
    • (1987) Chem. Rev. , vol.87 , pp. 307
    • O'Connor, J.M.1    Casey, C.P.2
  • 29
    • 3743154241 scopus 로고    scopus 로고
    • note
    • The reports cited in ref 3 do not include examples of reactions catalyzed by Ind complexes of early metals (e.g., olefin and silane polymerizations) because the ring slippage aptitude of the Ind ligand is not believed to be a factor in these, normally unsaturated, complexes.
  • 51
    • 3743115202 scopus 로고    scopus 로고
    • note
    • HA and FA represent the bending of the Ind ligand at C1/C3 and C3a/C7a, respectively, and ΔM-C = [1/2(M-C3a + M-C7a) - 1/2(M-C1 + M-C3)] (ref 6b).
  • 52
    • 3743053857 scopus 로고    scopus 로고
    • note
    • (a) Marder et al. (ref 9b) have shown that, in most cases, the Ind hapticity increases (i.e., ring slippage decreases) as the overall electron density at the metal center decreases, but they have also noted some exceptions to this phenomenon (ref 12b).
  • 56
    • 3743094005 scopus 로고    scopus 로고
    • note
    • The influence of charge polarization in Ni-X bonds on bond lengths and ligand labilities has been discussed recently by Bergman and co-workers in the context of a generalized electrostatic-covalent bonding model (ref 7d).
  • 60
    • 3743149733 scopus 로고    scopus 로고
    • note
    • We have shown (ref 6g) that this dynamic process is not due to phosphine exchange.
  • 61
    • 3743101821 scopus 로고    scopus 로고
    • note
    • 2 (ref 9b) have very similar ΔM-C values of 0.19 and 0.20 Å, respectively.
  • 62
    • 3743085242 scopus 로고    scopus 로고
    • note
    • 1H resonances for H2 and H3 appear at ca. 6.3 and 3.4 ppm, respectively, compared to ca. 6.2 and 3.2 for the corresponding resonances in 3-alkylindenes which have localized bonding in the five-membered ring. The similarity of these shifts suggests that the partially localized, unsymmetric hapticity of the Ind ligand observed in the solid state of 3 is largely preserved in the solution.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.