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Volumn 47, Issue 1, 2008, Pages 265-273

Lithium-alkyl, -aryl, and -amido ligand-exchange dynamics of dianionic zirconium(IV) complexes with chelating amidophenolate ligands

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EID: 38749115892     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic701112x     Document Type: Article
Times cited : (7)

References (51)
  • 9
    • 38749121547 scopus 로고    scopus 로고
    • 3-hybridized centers thanks to better orbital overlap in the transition state, see Collman, J. P.; Hegedus, L. S.; Norton, J. R.; Finke, R. G. Principles and Applications of Organotransition Metal Chemistry, 2nd ed.; University Science Books: Mill Valley, CA, 1987; Section 5.6.
    • 3-hybridized centers thanks to better orbital overlap in the transition state, see Collman, J. P.; Hegedus, L. S.; Norton, J. R.; Finke, R. G. Principles and Applications of Organotransition Metal Chemistry, 2nd ed.; University Science Books: Mill Valley, CA, 1987; Section 5.6.
  • 10
    • 2642616482 scopus 로고    scopus 로고
    • 2 have been attributed to inherent differences in the Zr-C bond strength. See Borkowsky, S. L.; Jordan, R. F.; Hinch, G. D. Organometallics 1991, 10, 1268-1274.
    • 2 have been attributed to inherent differences in the Zr-C bond strength. See Borkowsky, S. L.; Jordan, R. F.; Hinch, G. D. Organometallics 1991, 10, 1268-1274.
  • 11
    • 38749086297 scopus 로고    scopus 로고
    • SMART, Version 5.1; Bruker Analytical X-Ray Systems, Inc, Madison, WI, 1999
    • SMART, Version 5.1; Bruker Analytical X-Ray Systems, Inc.: Madison, WI, 1999.
  • 12
    • 38749091535 scopus 로고    scopus 로고
    • SAINT, Version 5.1; Bruker Analytical X-Ray Systems, Inc, Madison, WI, 1999
    • SAINT, Version 5.1; Bruker Analytical X-Ray Systems, Inc.: Madison, WI, 1999.
  • 13
    • 38749129335 scopus 로고    scopus 로고
    • Sheldrick, G. M. SADABS, Version 2.05; Bruker Analytical X-Ray Systems, Inc, Madison, WI, 2001
    • Sheldrick, G. M. SADABS, Version 2.05; Bruker Analytical X-Ray Systems, Inc.: Madison, WI, 2001.
  • 14
    • 38749106408 scopus 로고    scopus 로고
    • Sheldrick, G. M. SHELXTL, Version 6.12; Bruker Analytical X-Ray Systems, Inc, Madison, WI, 2001
    • Sheldrick, G. M. SHELXTL, Version 6.12; Bruker Analytical X-Ray Systems, Inc.: Madison, WI, 2001.
  • 15
    • 0003872738 scopus 로고
    • Kluwer Academic Publishers: Dordrecht, The Netherlands
    • International Tables for X-Ray Crystallography; Kluwer Academic Publishers: Dordrecht, The Netherlands, 1992; Vol. C.
    • (1992) International Tables for X-Ray Crystallography , vol.100
  • 18
    • 38749136844 scopus 로고    scopus 로고
    • 6, can be found in the Supporting Information.
    • 6, can be found in the Supporting Information.
  • 19
    • 38749109062 scopus 로고    scopus 로고
    • 2] can be isolated. A preliminary crystal structure confirms the connectivity and geometry proposed in eq I.
    • 2] can be isolated. A preliminary crystal structure confirms the connectivity and geometry proposed in eq I.
  • 21
    • 38749105284 scopus 로고    scopus 로고
    • 1H NMR spectroscopy was used to monitor the number of total number of Zr-Ph and Zr-p-tolyl groups. We had to assume that the rate of exchange of a PhLi for a p-tolylLi was independent of whether the neighboring group was PhLi or p-tolylLi. Since very similar rate constants were obtained for the forward and reverse reactions, this is a valid assumption.
    • 1H NMR spectroscopy was used to monitor the number of total number of Zr-Ph and Zr-p-tolyl groups. We had to assume that the rate of exchange of a PhLi for a p-tolylLi was independent of whether the neighboring group was PhLi or p-tolylLi. Since very similar rate constants were obtained for the forward and reverse reactions, this is a valid assumption.
  • 26
    • 0031684134 scopus 로고    scopus 로고
    • (b) Kaupp, M. Chem. Eur. J. 1998, 4, 1678-1686;
    • (1998) Chem. Eur. J , vol.4 , pp. 1678-1686
    • Kaupp, M.1
  • 40
    • 38749102566 scopus 로고    scopus 로고
    • 8 are broadened into the baseline, even at -35°C
    • 8 are broadened into the baseline, even at -35°C
  • 41
    • 38749093558 scopus 로고    scopus 로고
    • While symmetry allows for the ap2- ligand to be considered a 4π or even a 6π, electron donor, such electron counting would require the assignment of very unrealistic formal charges to the amidophenolate ligand
    • 2- ligand to be considered a 4π (or even a 6π!) electron donor, such electron counting would require the assignment of very unrealistic formal charges to the amidophenolate ligand.
  • 42
    • 38749084736 scopus 로고    scopus 로고
    • While the interpretation of activation entropies can be dubious, in this case, the similarity of the LiX exchange reaction and experimental conditions and the magnitude of the difference in ΔS‡ values allow for the use of these measured values to answer (or rather raise) mechanistic questions. See ref 34
    • While the interpretation of activation entropies can be dubious, in this case, the similarity of the LiX exchange reaction and experimental conditions and the magnitude of the difference in ΔS‡ values allow for the use of these measured values to answer (or rather raise) mechanistic questions. See ref 34.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.