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Volumn 125, Issue 14, 2003, Pages 4293-4305

Syndiospecific living propylene polymerization catalyzed by titanium complexes having fluorine-containing phenoxy-imine chelate ligands

Author keywords

[No Author keywords available]

Indexed keywords

LIGANDS;

EID: 0037427283     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja029560j     Document Type: Article
Times cited : (296)

References (130)
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    • In press
    • For detailed results, see the Supporting Information. Significantly, Chan et al. have recently reported the first NMR and X-ray structural evidence for an attractive interaction between a fluorine in the ligand and a hydrogen on a benzyl group attached to the central metal for group 4 transitionmetal complexes, potentially indicating the generality of the attractive interaction between the functionalized ligand and the polymer chain. Kui, S. C. F.; Zhu, N.; Chan, M. C. W. Angew. Chem., Int. Ed. In press.
    • Angew. Chem., Int. Ed.
    • Kui, S.C.F.1    Zhu, N.2    Chan, M.C.W.3
  • 106
    • 0242528062 scopus 로고    scopus 로고
    • note
    • Polymerization conditions: (a) cat;mol), MAO (5 mmol), 25 °C, 15 min;
  • 107
    • 0242444552 scopus 로고    scopus 로고
    • note
    • (b) cat. 1 (100 μmol), MAO (5 mmol), 25 °C, 30 min;
  • 108
    • 0242696927 scopus 로고    scopus 로고
    • note
    • (c) cat. 1 (30 μmol), MAO (5 mmol), 25 °C, 90 min.
  • 120
    • 0242528060 scopus 로고    scopus 로고
    • note
    • A volume of substituent was calculated as follows. The geometry of the substituent, which is capped with a hydrogen atom, was optimized using the 6-311G(d, p) basis set at the Hartree-Fock level, and its volume was calculated on the basis of the van der Waals radii of each atom. The geometry and its volume was calculated using the Spartan'02 program (Spartan'02, Wavefunction, Inc. Irvine, CA).
  • 121
    • 0242444551 scopus 로고    scopus 로고
    • note
    • βγ).
  • 122
    • 0242528061 scopus 로고    scopus 로고
    • note
    • m, 148 °C; rr/mr/mm (%), 95/4/1; H-T/H-H/T-T (%), 99/1/0.
  • 125
    • 9344220459 scopus 로고    scopus 로고
    • Brookhart et al. have successfully prepared a stereoblock polyketone with a Pd-based catalyst through a ligand exchange. Brookhart, M.; Wagner, M. I. J. Am. Chem. Soc. 1996, 118, 7219-7220.
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    • Brookhart, M.1    Wagner, M.I.2
  • 126
    • 0242696923 scopus 로고    scopus 로고
    • note
    • Cationic complexes described herein can take more than one configuration as a consequence of the different binding geometries of the phenoxyimine ligands. Therefore, the possibilities cannot be ruled out that a catalytically active species possesses configurations other than a trans-O and cis-N arrangement. If a catalytically active species has an octahedral geometry with a cis-O and cis-N disposition, the mechanism for the production of the syndiotactic polypropylene seems very complicated.
  • 130
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    • Molecular Structure Corp., 9009 New Trails Drive, The Woodlands, TX 77381-5209
    • TeXsan; Molecular Structure Corp., 9009 New Trails Drive, The Woodlands, TX 77381-5209, 1992.
    • (1992) TeXsan


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