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Volumn 39, Issue 29, 2010, Pages 6739-6752

Group 3 metal complexes supported by tridentate pyridine- and thiophene-linked bis(naphtholate) ligands: Synthesis, structure, and use in stereoselective ring-opening polymerization of racemic lactide and β-butyrolactone

Author keywords

[No Author keywords available]

Indexed keywords

AMIDO COMPLEXES; ATACTIC POLYMERS; BUTYROLACTONES; CALCULATED VALUES; DONOR LIGANDS; HIGH YIELD; LACTIDES; METAL CENTERS; POLY(3-HYDROXYBUTYRATE); POLY(LACTIDES); SILYL SUBSTITUENTS; SINGLE CRYSTAL X-RAY DIFFRACTION; SOLID-STATE STRUCTURES; STEREO-SELECTIVE; STEREOCONTROL; SYNDIOTACTICS;

EID: 77954701081     PISSN: 14779226     EISSN: 14779234     Source Type: Journal    
DOI: 10.1039/b920283h     Document Type: Article
Times cited : (71)

References (116)
  • 87
    • 0034607379 scopus 로고    scopus 로고
    • Note that the C2 and Cs symmetry refers here to the coordination mode of the ligand, but not to the complex because of the position of the amide and THF ligands As revealed by significant broadening of the α-THF hydrogens at intermediate temperatures (ca. room temperature), the same dynamic phenomena take place in scandium compound 4, but the resonances for the diastereotopic α-THF hydrogens appear incidentally isochronic in this case
    • J. Eppinger M. Speigler W. Hieringer W. A. Herrmann R. Anwander J. Am. Chem. Soc. 2000 122 3080
    • (2000) J. Am. Chem. Soc. , vol.122 , pp. 3080
    • Eppinger, J.1    Speigler, M.2    Hieringer, W.3    Herrmann, W.A.4    Anwander, R.5
  • 98
    • 0027541424 scopus 로고
    • 2 end-groups] gave values in close agreement with those determined by SEC analysis MALDI-ToF-MS analysis of some PLA samples recovered at high monomer conversions (>95%) showed distributions containing both even-membered and odd-membered oligomers, with peaks separated by 72 Da. This unambiguously established that transesterification processes take place in these systems, especially in the later stages of the polymerization For the pioneering work of Inoue in the immortal polymerizations of epoxides initiated with zinc complexes of N-substituted porphyrins, see:
    • I. Barakat P. Dubois R. Jerome P. Teyssie J. Polym. Sci., Part A: Polym. Chem. 1993 31 505 514
    • (1993) J. Polym. Sci., Part A: Polym. Chem. , vol.31 , pp. 505-514
    • Barakat, I.1    Dubois, P.2    Jerome, R.3    Teyssie, P.4
  • 112
    • 77954699709 scopus 로고    scopus 로고
    • The following atom numbering of the naphtholate unit is used
    • The following atom numbering of the naphtholate unit is used.
  • 113
    • 77954704990 scopus 로고    scopus 로고
    • 3H2 with the tris(amido) precursor were investigated instead of isolated compounds.We independently checked for 2 and 3 that the corresponding in situ systems lead to similar polymerization results
    • 3H2 with the tris(amido) precursor were investigated instead of isolated compounds.We independently checked for 2 and 3 that the corresponding in situ systems lead to similar polymerization results.
  • 114
    • 77954748825 scopus 로고    scopus 로고
    • 13C NMR spectroscopy, comparing the experimental triad/tetrad resonance intensities with those calculated from a Bernoullian statistics, gave results consistent with a chain-end stereocontrol mechanism. For instance, Table 3, entry 5 (resonance, experimental/calculated): rmr, 0.35/0.39; rmm/mmr, 0.07/0.05; mmr/rmm, 0.08/0.05; mrm+mmm, 0.50/0.44+0.07
    • 13C NMR spectroscopy, comparing the experimental triad/tetrad resonance intensities with those calculated from a Bernoullian statistics, gave results consistent with a chain-end stereocontrol mechanism. For instance, Table 3, entry 5 (resonance, experimental/calculated): rmr, 0.35/0.39; rmm/mmr, 0.07/0.05; mmr/rmm, 0.08/0.05; mrm+mmm, 0.50/0.44+0.07.
  • 115
    • 77954739582 scopus 로고    scopus 로고
    • n values must be done with caution since the latter values are uncorrected and might be overestimated. However, no reliable correction factor accounting for the difference in hydrodynamic radius between PHBs and polystyrene standards has been reported to our knowledge. SEC analysis of higher molecular weight PHBs is known to be problematic. See reference 7f and references cited therein
    • n values must be done with caution since the latter values are uncorrected and might be overestimated. However, no reliable correction factor accounting for the difference in hydrodynamic radius between PHBs and polystyrene standards has been reported to our knowledge. SEC analysis of higher molecular weight PHBs is known to be problematic. See reference 7f and references cited therein.


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