0000000000445223

AUTHOR

Yukihiro Takagi

showing 2 related works from this author

Pyrrolide-imine benzyl complexes of zirconium and hafnium: synthesis, structures, and efficient ethylene polymerization catalysis

2004

Abstract A series of pyrrolyl-imines HL1–6 was prepared by the condensation of pyrrole-2-carboxyaldehyde with different amines. The reaction of 2 equiv of pyrrolyl-imine with tetrabenzyl complexes of hafnium and zirconium M(CH2Ph)4 (M=Hf or Zr) gave dibenzyl complexes (L3–6)2M(CH2Ph)2, which were characterized by NMR spectroscopy and crystal structure analysis. NMR spectra of the complexes with secondary alkyl substituents at the imine nitrogen (isopropyl: 3a, 4-tert-butylcyclohexyl: 4a and 4b) suggest that rapid racemization between Δ and Λ configurations occurs in solution on the NMR time scale. The complexes with pyrrolide-imine ligands with a tertiary alkyl group such as tert-butyl (5a …

chemistry.chemical_classificationZirconiumOrganic ChemistryImineCationic polymerizationMethylaluminoxanechemistry.chemical_elementNuclear magnetic resonance spectroscopyBiochemistryInorganic Chemistrychemistry.chemical_compoundchemistryPolymer chemistryMaterials ChemistryOrganic chemistryPhysical and Theoretical ChemistryRacemizationIsopropylAlkylJournal of Organometallic Chemistry
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Efficient ethylene polymerisation catalysis by a cationic benzyl hafnium complex containing pyrrolide-imine ligandsElectronic supplementary informati…

2002

A dibenzyl hafnium(IV) complex containing pyrrolide-imine chelate ligands was synthesized and investigated as an ethylene polymerisation catalyst.

inorganic chemicalschemistryEthylene polymerizationPolymer chemistryCationic polymerizationchemistry.chemical_elementOrganic chemistryChelationGeneral ChemistryImine ligandsHafniumCatalysisJournal of the Chemical Society, Dalton Transactions
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