Synergistic Effect of Rigid and Flexible Substituents in Insertion Polymerization with α-Diimine Nickel and Palladium Catalysts

2021 ◽  
Author(s):  
Zijuan Hai ◽  
Zhou Lu ◽  
Shuaikang Li ◽  
Zhong-Yan Cao ◽  
Shengyu Dai
Keyword(s):  
Synergistic Effect ◽  
Steric Hindrance ◽  
Palladium Catalysts ◽  
Olefin Polymerization ◽  
Insertion Polymerization

α-Diimine catalysts with rigid steric hindrance demonstrated great potential in the field of olefin polymerization. We have recently focused on developing bulky yet flexible alkyl-substituted α-diimine catalysts and their application...

Bulky yet flexible substituents in insertion polymerization with α-diimine nickel and palladium systems

2019 ◽  
Vol 10 (35) ◽  
pp. 4866-4871 ◽  
Author(s):  
Lihua Guo ◽  
Wenting Sun ◽  
Shuaikang Li ◽  
Guoyong Xu ◽  
Shengyu Dai
Keyword(s):  
Steric Hindrance ◽  
Diimine Ligands ◽  
Insertion Polymerization

The bulky yet flexible substituent on the N-aryl moieties of α-diimine ligands may adopt different conformations and provide dynamic steric hindrance in the process of ethylene (co)polymerization.

Polymerization of 1-chloro-2-phenylacetylene by cationic monoanionic tridentate (S,S)-bis(oxazolinylphenyl)amido-ligated palladium catalysts: is it a coordination–insertion mechanism?

2018 ◽  
Vol 9 (39) ◽  
pp. 4856-4865 ◽  
Author(s):  
Xiaolu Wu ◽  
Zhi Yang ◽  
Xinwen Yan ◽  
Pengfei Zhang ◽  
Lin Wang ◽  
...  
Keyword(s):  
Palladium Catalysts ◽  
Insertion Mechanism ◽  
Insertion Polymerization

Cationic (S,S)-bis(oxazolinylphenyl)amido-ligated palladium species were first used for the coordination–insertion polymerization of 1-chloro-2-phenylacetylenes.

scholarly journals Chain Transfer to Solvent and Monomer in Early Transition Metal Catalyzed Olefin Polymerization: Mechanisms and Implications for Catalysis

Catalysts ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 215
Author(s):  
Francesco Zaccaria ◽  
Peter H. M. Budzelaar ◽  
Cristiano Zuccaccia ◽  
Roberta Cipullo ◽  
Alceo Macchioni ◽  
...  
Keyword(s):  
Transition Metal ◽  
Chain Transfer ◽  
Olefin Polymerization ◽  
Transfer Reactions ◽  
Organic Radical ◽  
Mechanistic Studies ◽  
Early Transition Metal ◽  
Polymerization Catalysis ◽  
Insertion Polymerization ◽  
Early Transition

Even after several decades of intense research, mechanistic studies of olefin polymerization by early transition metal catalysts continue to reveal unexpected elementary reaction steps. In this mini-review, the recent discovery of two unprecedented chain termination processes is summarized: chain transfer to solvent (CTS) and chain transfer to monomer (CTM), leading to benzyl/tolyl and allyl type chain ends, respectively. Although similar transfer reactions are well-known in radical polymerization, only very recently they have been observed also in olefin insertion polymerization catalysis. In the latter context, these processes were first identified in Ti-catalyzed propene and ethene polymerization; more recently, CTS was also reported in Sc-catalyzed styrene polymerization. In the Ti case, these processes represent a unique combination of insertion polymerization, organic radical chemistry and reactivity of a M(IV)/M(III) redox couple. In the Sc case, CTS occurs via a σ-bond metathesis reactivity, and it is associated with a significant boost of catalytic activity and/or with tuning of polystyrene molecular weight and tacticity. The mechanistic studies that led to the understanding of these chain transfer reactions are summarized, highlighting their relevance in olefin polymerization catalysis and beyond.

Flexible cycloalkyl substituents in insertion polymerization with α-diimine nickel and palladium species

2020 ◽  
Vol 11 (7) ◽  
pp. 1393-1400 ◽  
Author(s):  
Shengyu Dai ◽  
Shuaikang Li ◽  
Guoyong Xu ◽  
Cheng Wu ◽  
Yudan Liao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Olefin Polymerization ◽  
Insertion Polymerization ◽  
Transition Metal Catalyzed ◽  
Metal Catalyzed ◽  
The Relationship ◽  
Broad Interest

The investigation of the relationship between the structure of the catalyst and the microstructure of the obtained polymer has attracted much attention and broad interest in the field of transition metal-catalyzed olefin polymerization.

Homo- and copolymerization of norbornene using tridentate IzQO palladium catalysts with dimethylaminoethyl as a side arm

2021 ◽  
Author(s):  
Jie Dong ◽  
Baiquan Wang
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Palladium Catalysts ◽  
Olefin Polymerization ◽  
Heterocyclic Carbenes ◽  
Late Transition Metal ◽  
Polar Monomers ◽  
Late Transition

Late-transition metal complexes containing N-heterocyclic carbenes (NHCs) are still limited in the field of olefin polymerization, especially in the copolymerization of olefins with polar monomers. In this contribution, a series...

New olefin polymerization and copolymerization catalysts. Effect of coordinating functionalities

2001 ◽  
Vol 73 (2) ◽  
pp. 251-254 ◽  
Author(s):  
Ayusman Sen
Keyword(s):  
Transition Metal ◽  
Polymer Chain ◽  
Olefin Polymerization ◽  
Metal Center ◽  
Polar Monomers ◽  
Insertion Polymerization

The coordination of the functionalities that may be present either in the monomer or in the growing polymer chain to the metal center is a key impediment in the development of new transition metal-based catalysts for the insertion polymerization of polar monomers. Several examples are discussed to illustrate this problem. Additionally, it is shown that the reduction of the electrophilicity of the metal center is one way to decrease this interaction.

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