MAO‐free copolymerization of ethylene and 1-hexene with Ti (IV) complexes supported by fluorinated 2-hydroxymethylphenol derivatives

Binuclear Ti(IV) complex with new compartmental ligand 2,6‐(bis‐CF3‐carbinol)‐4‐tert‐butylphenol as precatalysts for ethylene polymerization and its copolymerization with propylene and 5‐ethylidene‐norbornene

“…It was previously shown that Ti(IV) alkoxide complexes stabilized by 2‐hydroxymethylphenol derivatives efficiently catalyze the copolymerization of ethylene with 1‐hexene. [ 31 ] Newly prepared binuclear complex 5 and known mononuclear analogue 6 were tested for their ability to catalyze ethylene‐propylene‐5‐ethylidene‐norbornene copolymerization. Ethylene‐propylene‐diene terpolymers (EPDM) are one of the popular synthetic rubbers.…”

“…Moreover, the values of tensile strength and average tensile modulus recorded at complex 4 are the highest in the entire series of titanium complexes stabilized by 2-hydroxymethylphenol derivatives. [16,[28][29][30][31] It is possible that the lower catalytic activity of binuclear complex 4 facilitates the formation of disentangled UHMWPE.…”

Impact of the method of Mg 2+ cation introducing into the titanium post-metallocene catalytic system on their activity

“…Among the vast majority of various post-metallocene polymerization catalysts developed over the past decades, [1][2][3][4][5][6] perhaps the least studied are complexes of group 4 metals with (O^O) type ligands, in which one or both hydroxyl groups are not phenolic, but alcoholic. These pre-catalysts have shown fairly high e ciency in the synthesis of ultra-high molecular weight polyethylene (UHMWPE), [7][8][9][10][11][12][13] a promising structural material of industrial interest. [14][15][16] However, the large molecular weight of the polymer and the presence of a three-dimensional network of macromolecule entanglements determines the very high viscosity of its melt, which greatly complicates its processing.…”

Synthesis of Ti Complexes Supported by an ortho-Terphenoxide Ligand and Their Applications in Alkyne Hydroamination Catalysis

“…G roup 4 aryloxide complexes have been used as catalysts in myriad transformations of unsaturated hydrocarbons, such as olefin polymerization, alkyne cyclotrimerization, and alkyne hydroamination. 1−7 Multidentate terphenyl aryloxide ligands, in particular, provide a robust sp 2 -only framework that can constrain the geometry of a metal complex. 8,9 Over the past decade, there has been a particular focus on the inorganic and organometallic chemistry of group 4 complexes of para-and meta-terphenoxide ligands (Figure 1).…”

“…Group 4 aryloxide complexes have been used as catalysts in myriad transformations of unsaturated hydrocarbons, such as olefin polymerization, alkyne cyclotrimerization, and alkyne hydroamination. − Multidentate terphenyl aryloxide ligands, in particular, provide a robust sp 2 -only framework that can constrain the geometry of a metal complex. , …”