Ethylene polymerization and ethylene/hexene copolymerization by vanadium(III) complexes bearing bidentate phenoxy-phosphine oxide ligands

2013 ◽  
Vol 51 (24) ◽  
pp. 5298-5306 ◽  
Author(s):  
Sen-Wang Zhang ◽  
Ling-Pan Lu ◽  
Ying-Yun Long ◽  
Yue-Sheng Li
Keyword(s):  
Phosphine Oxide ◽  
Ethylene Polymerization

Amidine/Phosphine‐Oxide‐Based Nickel Catalysts for Ethylene Polymerization and Copolymerization

ChemCatChem ◽  
2019 ◽  
Vol 11 (21) ◽  
pp. 5339-5344 ◽  
Author(s):  
Chen Zou ◽  
Chen Tan ◽  
Wenmin Pang ◽  
Changle Chen
Keyword(s):  
Phosphine Oxide ◽  
Ethylene Polymerization ◽  
Nickel Catalysts

A new family of monocyclopentadienyl organoscandium bis-alkyls supported by a bulky trialkylphosphine oxide ancillary

2004 ◽  
Vol 82 (2) ◽  
pp. 162-165 ◽  
Author(s):  
Lee D Henderson ◽  
Glen D MacInnis ◽  
Warren E Piers ◽  
Masood Parvez
Keyword(s):  
Crystal Structures ◽  
Phosphine Oxide ◽  
Ethylene Polymerization ◽  
Olefin Polymerization ◽  
Activation Parameters ◽  
Ion Pair ◽  
Associative Mechanism ◽  
New Family ◽  
Contact Ion Pair ◽  
Trialkylphosphine Oxide

Treatment of the oligomeric compound [Cp*ScCl2]n (Cp* = C5Me5) with tri-tert-butylphosphine oxide in THF leads to the monocyclopentadienyl scandium dichloride [Cp*(t-Bu3P=O)ScCl2] as a monomeric, THF-free solid in 72% yield. This compound can be alkylated with MeLi to give the corresponding dimethyl derivative, [Cp*(t-Bu3P=O)ScMe2], 1. The crystal structures of these two compounds have been done and reveal a three-legged piano stool geometry about the scandium center. The coordinated phosphine oxide ligand exchanges with free donor in both compounds via an associative mechanism, as indicated by the activation parameters (ΔH‡ = 6.4–8.4 kcal mol–1-; ΔS‡ = –22.5 to –26.6 eu). Thus, the Cp*(t-Bu3P=O) ligand set provides a stable platform for organoscandium chemistry. This was demonstrated by the activation of 1 by treatment with B(C6F5)3 to form the fully characterized contact ion pair [Cp*(t-Bu3P=O)ScMe]+[MeB(C6F5)3]–, 2, which is an active ethylene polymerization catalyst.Key words: organoscandium compounds, olefin polymerization, cationic complexes.

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