Steric and electronic effects in cationic pyridine carboxamidate nickel mediated ethylene polymerization and copolymerization with methyl 10-undecenoate DOI
Pei Li, Hongju Liu,

Wanlu Tian

et al.

Polymer, Journal Year: 2023, Volume and Issue: 280, P. 126060 - 126060

Published: May 30, 2023

Language: Английский

Phosphonium-Catalyzed Monoreduction of Bisphosphine Dioxides: Origin of Selectivity and Synthetic Applications DOI
Jing Xue, Yushan Zhang,

Zhen Huan

et al.

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(13), P. 9335 - 9346

Published: March 19, 2024

Controlling product selectivity in successive reactions of the same type is challenging owing to comparable thermodynamic and kinetic properties involved. Here, synergistic interaction two phosphoryl groups bisphosphine dioxides (BPDOs) with a bromo-phosphonium cation was studied experimentally provide practical tool for substrate–catalyst recognition. As eventual result, we have developed phosphonium-catalyzed monoreduction chiral BPDOs access an array synthetically useful monoxides (BPMOs) axial, spiro, planar chirality, which are otherwise synthesize before. The reaction features excellent impressive reactivity. It proceeds under mild conditions, avoiding use superstoichiometric amounts additives metal catalysts simplify synthetic procedure. accessibility scalability allowed rapid construction ligand library optimization asymmetric Heck-type cyclization, laying foundation broad range applications BPMOs catalysis.

Language: Английский

Citations

5
The greener side of polymers in the light of d-block metal complexes as precatalysts DOI
Marta Pawlak, Joanna Drzeżdżon, Dagmara Jacewicz

et al.

Coordination Chemistry Reviews, Journal Year: 2023, Volume and Issue: 484, P. 215122 - 215122

Published: March 21, 2023

Language: Английский

Citations

12
Lewis acid-induced homo- and heterogeneous nickel catalysts for ethylene polymerization and copolymerization with polar monomers DOI

Wanlu Tian,

Chao Li, Chen Tan

et al.

Polymer Chemistry, Journal Year: 2024, Volume and Issue: 15(7), P. 631 - 638

Published: Jan. 1, 2024

By introducing soluble and supported Lewis acids, homogeneous heterogeneous nickel-catalyzed ethylene (co)polymerization was designed studied.

Language: Английский

Citations

4
Mechanistic Insights into Rare-Earth-Catalyzed Alternating Copolymerization through C–H Polyaddition of Functionalized Organic Compounds to Unconjugated Dienes DOI
Lei Shi, Ni Zhang,

Zuqian Xue

et al.

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(18), P. 8079 - 8091

Published: April 25, 2024

Density functional theory (DFT) calculations have been conducted to elucidate the detailed mechanisms of yttrium-catalyzed C–H polyaddition 1,4-dimethoxybenzene (DMB) 1,4-divinylbenzene (DVB). It was computationally determined that DMB not only serves as a substrate but also performs crucial role ligand, stabilizing catalytically active species and promoting alkene insertion. Side pathways involving Cβ–H activation C═C continuous insertion were excluded due steric electronic factors, respectively, explaining why reaction occurred efficiently selectively give perfectly alternating DMB–DVB polymers. Interestingly, theoretical prediction reactivity N,N-dimethyl-1,4-phenylenediamine 2,2′-biethyl-4,4′-bipyridine reveals significant differences in coordination effects these substrates, leading distinct mechanisms, primarily influenced by their effects. These findings shed new light on previously overlooked ligand rare-earth-catalyzed step-growth copolymerization reactions.

Language: Английский

Citations

4
Heterogeneous α‐Diimine Nickel Catalysts with Improved Catalytic Performance in Ethylene Polymerization DOI
Zhanshan Ma,

Mengli Xu,

Ningning Zhu

et al.

Chinese Journal of Chemistry, Journal Year: 2023, Volume and Issue: 41(10), P. 1155 - 1162

Published: Jan. 20, 2023

Comprehensive Summary Heterogenization can improve the thermal tolerance of olefin polymerization catalysts and result in good product morphology control, which are two important parameters for industrial polyethylene production. In this work, α‐diimine nickel bearing –OH or –ONa anchoring groups were designed prepared. The enable facile heterogenization on silica. heterogeneous demonstrated enhanced stabilities, along with high catalytic activity at 120 °C (up to 5.5 × 10 6 g·PE·mol·Ni –1 ·h ). Furthermore, process results improvements many other parameters, including polymer 1.9 7 ) molecular weight ( M n up 2.3 g·mol More importantly, structure properties products be controlled by catalyst structures, conditions achieve mechanical elasticity.

Language: Английский

Citations

11
A Multifunctional Biomass Zinc Catalyst for Epoxy-Based Vitrimers and Composites DOI

Wen Cai,

Yongshuang Huang,

Jie Li

et al.

European Polymer Journal, Journal Year: 2023, Volume and Issue: 188, P. 111936 - 111936

Published: Feb. 20, 2023

Language: Английский

Citations

10
Unraveling the Compounded Interplay of Weakly and Strongly Coordinating Ligands in G3-Catalyzed Living Metathesis Polymerization: toward Well-Defined Polynorbornene at Ambient Temperature DOI
Tiantian Wang,

Yajuan Shi,

Shen Li

et al.

Macromolecules, Journal Year: 2023, Volume and Issue: 56(18), P. 7379 - 7388

Published: Aug. 18, 2023

Ambient temperature ring-opening metathesis polymerization (ROMP) of unhindered cycloolefins is crucial for industrial applications from a sustainable perspective. However, balancing the reactivity propagating species and polymer molecular structure remains challenge due to competing secondary at ambient temperature. We report facile ligand-competition strategy achieving excellent control over 3-bromopyridine-coordinated Grubbs' third-generation catalyst (3-bropyr-G3)-catalyzed ROMP unsubstituted norbornene (NB). The addition external pyridine with strong coordinating affinity regulate catalytic activity capable tuning rates. Importantly, our allows well-controlled NB both low (i.e., −20 °C) 20 temperatures, yielding PNB quantitative Mn D̵ (≤1.07). Synergetic experimental computational investigations suggest that stably coordinated can prevent Ru center attacking backbone C═C double bonds by breaking interaction between original weakly ligand carbene thus mitigates intermolecular chain transfer. This study guides design new G3-catalyzed systems balance structures.

Language: Английский

Citations

10
Efficient Synthesis of Polyethylene Wax Using 8-(Arylimino)-5,6,7-Trihydroquinoline Sio 2 -Supported Heterogeneous Nickel Catalysts DOI

Shan Xu,

Xu Hu,

Mengna Lei

et al.

Published: Jan. 1, 2025

Language: Английский

Citations

0
Efficient synthesis of polyethylene wax using 8-(arylimino)-5,6,7-trihydroquinoline SiO2-supported heterogeneous nickel catalysts DOI

Shan Xu,

Hu Xu,

Mengna Lei

et al.

Polymer, Journal Year: 2025, Volume and Issue: unknown, P. 128367 - 128367

Published: April 1, 2025

Language: Английский

Citations

0
Branched Polyethylene Synthesized by Salicylaldiminato Nickel Complexes with an Ethereal Donor Group DOI
Yi Wu,

Inzamam Abbasi,

Chenggong Sang

et al.

Organometallics, Journal Year: 2025, Volume and Issue: unknown

Published: May 19, 2025

Language: Английский

Citations

0