Olefin polymerization by cyclopentadienyltris(dimethylamido)titanium(IV) complexes

Synthesis, characterization and reactivity of new complexes of titanium and zirconium containing a potential tridentate amidinato-cyclopentadienyl ligand

“…This behaviour is in contrast with the results obtained in ethylene polymerisation with various Cp tris-dimethylamido titanium CpTi(NMe 2 ) 3 catalyst precursors. 27 The decrease in productivity is most likely due to the difficulty in substituting the ancillary dimethylamido ligands with methyl groups by TMA or to a long premix time that evidences the instability of the metal alkyl catalyst precursors. It may be worth noting that the interaction of TMA with the pyridine and thiazole N donors could prevent formation of cationic pre-activated species to give different products responsible for the broad distributions of the molecular weights.…”

Synthesis, characterization and reactivity of new complexes of titanium and zirconium containing a potential tridentate amidinato-cyclopentadienyl ligand

“…This behaviour is in contrast with the results obtained in ethylene polymerisation with various Cp tris-dimethylamido titanium CpTi(NMe 2 ) 3 catalyst precursors. 27 The decrease in productivity is most likely due to the difficulty in substituting the ancillary dimethylamido ligands with methyl groups by TMA or to a long premix time that evidences the instability of the metal alkyl catalyst precursors. It may be worth noting that the interaction of TMA with the pyridine and thiazole N donors could prevent formation of cationic pre-activated species to give different products responsible for the broad distributions of the molecular weights.…”

Synthesis, characterization and reactivity of new complexes of titanium and zirconium containing a potential tridentate amidinato-cyclopentadienyl ligand

“…This behaviour is in contrast with the results obtained in ethylene polymerisation with various Cp tris-dimethylamido titanium CpTi(NMe 2 ) 3 catalyst precursors. 27 The decrease in productivity is most likely due to the difficulty in substituting the ancillary dimethylamido ligands with methyl groups by TMA or to a long premix time that evidences the instability of the metal alkyl catalyst precursors. It may be worth noting that the interaction of TMA with the pyridine and thiazole N donors could prevent formation of cationic pre-activated species to give different products responsible for the broad distributions of the molecular weights.…”

Synthesis, characterization and reactivity of new complexes of titanium and zirconium containing a potential tridentate amidinato-cyclopentadienyl ligand

“…This behaviour is in contrast with the results obtained in ethylene polymerisation with various Cp tris-dimethylamido titanium CpTi(NMe 2 ) 3 catalyst precursors. 27 The decrease in productivity is most likely due to the difficulty in substituting the ancillary dimethylamido ligands with methyl groups by TMA or to a long premix time that evidences the instability of the metal alkyl catalyst precursors. It may be worth noting that the interaction of TMA with the pyridine and thiazole N donors could prevent formation of cationic pre-activated species to give different products responsible for the broad distributions of the molecular weights.…”