scholarly journals Use of Titanium Complexes Bearing Diphenolate or Calix[n]arene Ligands in α-Olefin Polymerization and the ROP of Cyclic Esters

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 210 ◽  
Author(s):  
Orlando Santoro ◽  
Carl Redshaw
Keyword(s):  
Ring Opening ◽  
Olefin Polymerization ◽  
Ring Opening Polymerization ◽  
Molecular Structures ◽  
Titanium Complexes ◽  
Cyclic Esters ◽  
Arene Ligands ◽  
Catalytic Behaviour

In this review, we discuss the use of titanium complexes bearing either bridged diphenolate or calix[n]arene (n = 4, 6, 8) ligation, in the formation of plastics from α-olefins or via the ring opening polymerization (ROP) of cyclic esters. The syntheses, molecular structures and catalytic behaviour of these systems are discussed, as well as where possible, the properties of the resultant polymers.

scholarly journals Metallocalixarene catalysts: α-olefin polymerization and ROP of cyclic esters

2016 ◽  
Vol 45 (22) ◽  
pp. 9018-9030 ◽  
Author(s):  
Carl Redshaw
Keyword(s):  
Ring Opening ◽  
Olefin Polymerization ◽  
Ring Opening Polymerization ◽  
Arene Complexes ◽  
Cyclic Esters

This perspective review discusses metallocalix[n]arene complexes that have been employed in either α-olefin polymerization or in the ring opening polymerization (ROP) of cyclic esters over the last 5 years.

Improvement in titanium complexes supported by Schiff bases in ring-opening polymerization of cyclic esters: ONO-tridentate Schiff bases

Polymer ◽  
2018 ◽  
Vol 140 ◽  
pp. 315-325 ◽  
Author(s):  
Hsiu-Wei Ou ◽  
Wei-Yi Lu ◽  
Jaya Kishore Vandavasi ◽  
Ya-Fan Lin ◽  
Hsuan-Ying Chen ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Titanium Complexes ◽  
Cyclic Esters

scholarly journals Coordination Ring-Opening Polymerization of Cyclic Esters: A Critical Overview of DFT Modeling and Visualization of the Reaction Mechanisms

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4117 ◽  
Author(s):  
Ilya Nifant’ev ◽  
Pavel Ivchenko
Keyword(s):  
Ring Opening ◽  
Density Functional ◽  
Transition States ◽  
Ring Opening Polymerization ◽  
Molecular Structures ◽  
Data Sets ◽  
Dft Methods ◽  
Cyclic Esters ◽  
Dft Modeling ◽  
The Difference

Ring-opening polymerization (ROP) of cyclic esters (lactones, lactides, cyclic carbonates and phosphates) is an effective tool to synthesize biocompatible and biodegradable polymers. Metal complexes effectively catalyze ROP, a remarkable diversity of the ROP mechanisms prompted the use of density functional theory (DFT) methods for simulation and visualization of the ROP pathways. Optimization of the molecular structures of the key reaction intermediates and transition states has allowed to explain the values of catalytic activities and stereocontrol events. DFT computation data sets might be viewed as a sound basis for the design of novel ROP catalysts and cyclic substrates, for the creation of new types of homo- and copolymers with promising properties. In this review, we summarized the results of DFT modeling of coordination ROP of cyclic esters. The importance to understand the difference between initiation and propagation stages, to consider the possibility of polymer–catalyst coordination, to figure out the key transition states, and other aspects of DFT simulation and visualization of ROP have been also discussed in our review.

Titanium Complexes of Pyrrolylaldiminate Ligands and Their Exploitation for the Ring-Opening Polymerization of Cyclic Esters

2021 ◽  
Author(s):  
Kanokon Upitak ◽  
Worawat Wattanathana ◽  
Tanin Nanok ◽  
Pitak Chuawong ◽  
Pimpa Hormnirun
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Titanium Complexes ◽  
Cyclic Esters ◽  
X Ray

A series of six-coordinate titanium complexes 1−6 supported by pyrrolylaldiminate ligands were prepared via the reaction of 2 equivalent of ligands and Ti(OiPr)4 in toluene at 70 ºC. The X-ray...

scholarly journals Titanium complexes bearing oxa- and azacalix[4, 6]arenes: structural studies and use in the ring opening homo-/co-polymerization of cyclic esters

2021 ◽  
Vol 50 (12) ◽  
pp. 4396-4407
Author(s):  
Tian Xing ◽  
Timothy J. Prior ◽  
Kai Chen ◽  
Carl Redshaw
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Structural Studies ◽  
Titanium Complexes ◽  
Cyclic Esters

Rare examples of titanium oxa- and aza-calixarenes are reported which are active for the ring opening polymerization (ROP) of ε-caprolactone, δ-valerolactone and rac-lactide.

A switchable dimeric yttrium complex and its three catalytic states in ring opening polymerization

2021 ◽  
Author(s):  
Shijie Deng ◽  
Paula L. Diaconescu
Keyword(s):  
Ring Opening ◽  
Ring Opening Polymerization ◽  
Oxidation States ◽  
Cyclic Esters

A dimeric yttrium phenoxide complex can be oxidized in a stepwise fashion to access three oxidation states. The three states show different activity in the ring opening polymerization of cyclic esters and epoxides.

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