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64749101911
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The two terms correspond to two different aspects: The term singlesite catalyst implies that in contrast to heterogeneous polymerization catalysts all the metal centers in homogeneous catalysts reside in identical environments. The term double site means that polymerization catalysis requires the presence of two coordination sites on the metal.
-
The two terms correspond to two different aspects: The term "singlesite catalyst" implies that in contrast to heterogeneous polymerization catalysts all the metal centers in homogeneous catalysts reside in identical environments. The term "double site" means that polymerization catalysis requires the presence of two coordination sites on the metal.
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11
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For the 13C NMR analysis of hemiisotactic polypropene prepared from 2-methylpentadiene, see: (a) Farina, M.; Di Silvestro, G.; Sozzani, P. Macromolecules 1982, 15, 1451.
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1-symmetric metallocenes, see: (a) Price, C. J.; Irwin, L. J.; Aubry, D. A.; Miller, S. A. pp 37-82, in ref 1.
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1-symmetric metallocenes, see: (a) Price, C. J.; Irwin, L. J.; Aubry, D. A.; Miller, S. A. pp 37-82, in ref 1.
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17
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For isospecific polymerization by C1-symmetric catalysts invoking the alternating mechanism, see: Miller, S. A.; Bercaw, J. E. Organometallics 2006, 254, 3576.
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18
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For hemiisotactic-isotactic blocks, see: Miller, S. A.; Bercaw, J. E. Organometallics 2002, 21, 934.
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1-symmetric metallocenes not invoking site-epimerization, see: van der Leek, Y.; Angermund, K.; Reffke, M.; Kleinschmidt, R.; Goretzki, R.; Fink, G. Chem.-Eur. J. 1997, 3, 585.
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1-symmetric metallocenes not invoking site-epimerization, see: van der Leek, Y.; Angermund, K.; Reffke, M.; Kleinschmidt, R.; Goretzki, R.; Fink, G. Chem.-Eur. J. 1997, 3, 585.
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0037121771
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We prefer the fac-fac, mer-mer, and fac-mer (mer-fac) terminology over the respective cis-R, trans, and cis - terminology, for describing the wrapping modes of linear tetradentate ligands around octahedral metal centers, since they relate to the chelating ligand and not to the remaining coordination sites, give a better notion of the symmetry of the complex, and are more informative. See: (a) García-Zarracino, R.; Ramos-Quiñones, J.; Höpfl, H. J. Organomet. Chem. 2002, 664, 188.
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We prefer the fac-fac, mer-mer, and fac-mer (mer-fac) terminology over the respective cis-R, trans, and cis - terminology, for describing the wrapping modes of linear tetradentate ligands around octahedral metal centers, since they relate to the chelating ligand and not to the remaining coordination sites, give a better notion of the symmetry of the complex, and are more informative. See: (a) García-Zarracino, R.; Ramos-Quiñones, J.; Höpfl, H. J. Organomet. Chem. 2002, 664, 188.
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(b) Yeori, A.; Gendler, S.; Groysman, S.; Goldberg, I.; Kol, M. Inorg. Chem. Commun. 2004, 7, 280.
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26
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0042763632
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Bis(phenoxy-imine) catalysts are structurally related to the Salans, but have led to highly active or syndiospecific polymerizations. For several reviews, see: (a) Suzuki, Y.; Terano, H.; Fujita, T. Bull. Chem. Soc. Jpn. 2003, 76, 1493.
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Bis(phenoxy-imine) catalysts are structurally related to the Salans, but have led to highly active or syndiospecific polymerizations. For several reviews, see: (a) Suzuki, Y.; Terano, H.; Fujita, T. Bull. Chem. Soc. Jpn. 2003, 76, 1493.
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27
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44349179745
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1264, contrast, bis(phenoxy-ketimine) complexes led to isospecific polymerization
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(b) Matsugi, T.; Fujita, T. Chem. Soc. ReV. 2008, 37, 1264. In contrast, bis(phenoxy-ketimine) complexes led to isospecific polymerization:
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(c) Edson, J. B.; Wang, Z.; Kramer, E. J.; Coates, G. W. J. Am. Chem. Soc. 2008, 130, 4968.
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For complexes of Salen ligands that wrap analogously and lead to isotactic polymers of high olefins, see: Strianese, M, Lamberti, M, Mazzeo, M, Pellecchia, C. Macromol. Chem. Phys. 2008, 209, 585
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For complexes of Salen ligands that wrap analogously and lead to isotactic polymers of high olefins, see: Strianese, M.; Lamberti, M.; Mazzeo, M.; Pellecchia, C. Macromol. Chem. Phys. 2008, 209, 585.
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30
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0037473506
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For Ti complexes of related [OSSO]-type ligands that led to isotactic styrene polymerization, see: Capacchione, C.; Proto, A.; Ebeling, H.; Mülhaupt, R. Moller, K.; Spaniol, T. P.; Okuda, J. J. Am. Chem. Soc. 2003, 125, 4964.
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For Ti complexes of related [OSSO]-type ligands that led to isotactic styrene polymerization, see: Capacchione, C.; Proto, A.; Ebeling, H.; Mülhaupt, R. Moller, K.; Spaniol, T. P.; Okuda, J. J. Am. Chem. Soc. 2003, 125, 4964.
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For flexible zirconium complexes of [OSSO]-type ligands, see: Cohen, A.; Yeori, A.; Goldberg, I.; Kol, M. Inorg. Chem. 2007, 46, 8114.
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For flexible zirconium complexes of [OSSO]-type ligands, see: Cohen, A.; Yeori, A.; Goldberg, I.; Kol, M. Inorg. Chem. 2007, 46, 8114.
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32
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0035545007
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For propylene homopolymerization and ethylene-propylene blockcopolymerization employing this type of zirconium-Salan complexes, see: (a) Busico, V, Cipullo, R, Ronca, S, Budzelaar, P. H. M. Macromol. Rapid Commun, 2001, 22, 1405
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For propylene homopolymerization and ethylene-propylene blockcopolymerization employing this type of zirconium-Salan complexes, see: (a) Busico, V.; Cipullo, R.; Ronca, S.; Budzelaar, P. H. M. Macromol. Rapid Commun. 2001, 22, 1405.
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41849140036
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These catalysts were highly active in the isospecific polymerization of the bulky monomer vinylcyclohexane: Segal, S, Yeori, A, Shuster, M, Rosenberg, Y, Kol, M. Macromolecules 2008, 41, 1612
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These catalysts were highly active in the isospecific polymerization of the bulky monomer vinylcyclohexane: Segal, S.; Yeori, A.; Shuster, M.; Rosenberg, Y.; Kol, M. Macromolecules 2008, 41, 1612.
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For related chiral fluorous dialkoxy-diamine ligands that wrapped around zirconium non-diastereoselectively and gave poly(1-hexene) of medium isotacticity, see: Kirillov, E, Lavanat, L, Thomas, C, Roisnel, T, Chi, Y, Carpentier, J.-F. Chem.-Eur. J. 2007, 13, 923
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For related chiral fluorous dialkoxy-diamine ligands that wrapped around zirconium non-diastereoselectively and gave poly(1-hexene) of medium isotacticity, see: Kirillov, E.; Lavanat, L.; Thomas, C.; Roisnel, T.; Chi, Y.; Carpentier, J.-F. Chem.-Eur. J. 2007, 13, 923.
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C1-Symmetric titanium complexes including two different phenoxyimine ligands exhibited enhanced polymerization activity: Mason, A. F.; Coates, G. W. J. Am. Chem. Soc. 2004, 126, 10798.
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64749083458
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These molecular weights are higher than expected based on calculated catalyst activity and polymerization time and imply partial catalyst activation
-
These molecular weights are higher than expected based on calculated catalyst activity and polymerization time and imply partial catalyst activation.
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49
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64749090233
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Preliminary experiments indicated that polymerization of 1-hexene by Lig2ZrBn2 activated with either [Ph3C][B(C6F 5)4] or [PhNMe2H, B(C6F 5)4, 1.5 equiv) yielded poly(1-hexene) of similar isotacticity and molecular weights as that obtained from Lig 2ZrBn2/B(C6F5)3. Polymerization of 1-hexene by Lig2ZrBn2 activated with MAO (500 equiv) led to poly(1- hexene) of slightly reduced isotacticity and considerably reduced molecular weight
-
2 activated with MAO (500 equiv) led to poly(1- hexene) of slightly reduced isotacticity and considerably reduced molecular weight.
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50
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64749114330
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A dibenzylzirconium complex of a Salan ligand with the same phenolates and trans-1,2 diaminocyclohexane skeleton yielded poly(1- hexene) having the same degree of isotacticity.
-
A dibenzylzirconium complex of a Salan ligand with the same phenolates and trans-1,2 diaminocyclohexane skeleton yielded poly(1- hexene) having the same degree of isotacticity.
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