Journal ArticleDOI
Titanium and zirconium complexes of robust salophan ligands. Coordination chemistry and olefin polymerization catalysis.
TLDR
The synthesis of [ONNO]-type robust Salophan ligands featuring tertiary nitrogen donors featuring tertiaries nitrogen donors is described for the first time.Abstract:
The synthesis of [ONNO]-type robust Salophan ligands featuring tertiary nitrogen donors is described for the first time. By varying the substitution pattern on the aromatic bridge and on the phenol...read more
Citations
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Journal ArticleDOI
Tridentate ligands and beyond in group IV metal α-olefin homo-/co-polymerization catalysis
TL;DR: This review underlines the efforts made in the last few years with regard to the use of tridentate ligands and beyond in the field of α-olefin polymerization using catalytic systems based on group IV metals.
Journal ArticleDOI
Ring-Opening Polymerization of Lactide with Zr Complexes of {ONSO} Ligands: From Heterotactically Inclined to Isotactically Inclined Poly(lactic acid)
TL;DR: The tetradentate-diainionic imine-thiobis(phenolate) ligands were obtained by a two-step synthesis in this article, where the most flexible complex and the most rigid complex gave the highest degrees of heterotacticity and isotacticity, respectively.
Journal ArticleDOI
New facets of an old ligand: titanium and zirconium complexes of phenylenediamine bis(phenolate) in lactide polymerisation catalysis
TL;DR: Phenylenediamine bis(phenolate) binds in the reduced dianionic form to titanium and zirconium alkoxides giving either mononuclear or bridging dinuclear complexes depending on the metal precursors.
Journal ArticleDOI
Exploitation of dinuclear salan aluminum complexes for versatile copolymerization of ε-caprolactone and L-lactide
Yuan Wang,Haiyan Ma +1 more
TL;DR: By combining the influence of excess alcohol, temperature and monomer-to-initiator ratios in the feed, dinuclear salan aluminum complexes L(R)Al(2)Me(4) exhibited a high degree of control towards the copolymerization of L-LA and ε-CL, producing blocky, gradient, tapered and random copolymers.
References
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Journal ArticleDOI
Remarkable Stereocontrol in the Polymerization of Racemic Lactide Using Aluminum Initiators Supported by Tetradentate Aminophenoxide Ligands
Pimpa Hormnirun,Edward L. Marshall,Vernon C. Gibson,and Andrew J. P. White,David J. Williams +4 more
TL;DR: In this paper, a new family of aluminum complexes bearing tetradentate bis(aminophenoxide) ligands is reported and shown to initiate the living ring-opening polymerization of rac-lactide.
Journal ArticleDOI
Isospecific Living Polymerization of 1-Hexene by a Readily Available Nonmetallocene C2-Symmetrical Zirconium Catalyst
TL;DR: In this article, a nonmetallocene C2symmetrical complex was proposed for the polymerization of 1-hexene, which can be synthesized by a one-pot Mannich condensation between di(secondary) amines, formaldehyde, and substituted phenols.
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Titanium and zirconium complexes of dianionic and trianionic amine-phenolate-type ligands in catalysis of lactide polymerization.
TL;DR: The synthesis of alkoxotitanium and -zirconium complexes of seven chelating tetradentate di- or trianionic amine-phenolate ligands belonging to three families and their application in L-lactide polymerization are described.
Journal ArticleDOI
Do new century catalysts unravel the mechanism of stereocontrol of old Ziegler-Natta catalysts?
TL;DR: Well-defined homogeneous and octahedral complexes that polymerize propene to polypropylenes with microstructures extremely similar to those of polymers produced with the traditional catalysts were discovered and offer the exciting opportunity to achieve insights into the mechanism of stereocontrol operative with theTraditional catalytic systems.
Journal ArticleDOI
Zirconium and Titanium Diamine Bis(phenolate) Catalysts for α-Olefin Polymerization: From Atactic Oligo(1-hexene) to Ultrahigh-Molecular-Weight Isotactic Poly(1-hexene)
TL;DR: Aiming at higher activities of group IV diamine bis(phenolate) catalysts in olefin polymerization, ligands containing electron-withdrawing groups have been introduced.