FI Catalysts for Olefin Oligomerization and Polymerization: Production of Useful Olefin-Based Materials by Unique Catalysis

New Coordination Modes for Modified Schiff Base Ti(IV) Complexes and Their Control over Lactone Ring-Opening Polymerization Activity

“…For example, bis(phenoxy-imine) Group IV complexes are successful and highly active olefin polymerization catalysts; their development was pioneered by Fujita and co-workers working at Mitsui. 20 Structure activity studies, revealed that some of the best rates are observed for cumyl substituents at the ortho-phenolate site, 10 whilst living polymerization of ethene or propene was observed for pentafluorophenyl imine substituents. [21][22][23] Bis(phenoxyether)Ti(IV) complexes are also effective olefin polymerization catalysts, although activities are generally lower than phenoxy-imine counterparts.…”

Alkene oligomerization via metallacycles: Recent advances and mechanistic insights

“…This allows both the coordination of only one FI ligand as well as an octahedral geometry around titanium. [35] In their research on switching polymerization "(FI) 2 Ti" catalysts to oligomerization catalysts, Fujita and coworkers first synthesized a version of the "(FI)Ti" featuring a flexible ether binding moiety (Scheme 11, left) which generated 34.5% of 1-hexene together with 65.5% of PE, with a moderate activity of 0.1kg of product/mmol Ti -1 .h -1 (P C2H4 =0.8MPa, 25°C, 30min). [28] Replacing the alkyl linker (1 st generation) between the imine and the ether by a bi-aryl (2 nd generation, Scheme 11, right) led to a drastic improvement of selectivity (up to 94.8%) and activity (up to 31.9kg of product/mmol Ti -1 .h -1 ).…”

Synthesis of Biodegradable Polymers: A Review on the Use of Schiff-Base Metal Complexes as Catalysts for the Ring Opening Polymerization (ROP) of Cyclic Esters

“…Hence, alternative systems based on different metal/ligand combinations, capable of better control over the polymerization process, have been explored [11][12][13][14][15][16]. Complexes derived from Schiff-base ligands emerged as efficient catalysts for the polymerization of α-olefins [17][18][19][20][21], and their use in the production of biodegradable polymers has been receiving growing interest. The success of Schiff-base ligands resides in their high tune-ability and availability.…”