propene polymerization
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ansa-Zirconocene Catalysts for Isotactic-Selective Propene Polymerization at High Temperature: A Long Story Finds a Happy Ending

2021 ◽  
Author(s):  
Pavel S. Kulyabin ◽  
Georgy P. Goryunov ◽  
Mikhail I. Sharikov ◽  
Vyatcheslav V. Izmer ◽  
Antonio Vittoria ◽  
...  
Keyword(s):  
High Temperature ◽  
Happy Ending ◽  
Propene Polymerization

scholarly journals Breaking Symmetry Rules Enhance the Options for Stereoselective Propene Polymerization Catalysis

2020 ◽  
Vol 53 (8) ◽  
pp. 2959-2964 ◽  
Author(s):  
Claudio De Rosa ◽  
Rocco Di Girolamo ◽  
Ana B. Muñoz-García ◽  
Michele Pavone ◽  
Giovanni Talarico
Keyword(s):  
Polymerization Catalysis ◽  
Propene Polymerization ◽  
Breaking Symmetry ◽  
Symmetry Rules

scholarly journals Sequential immobilization of ansa-hafnocene complexes for propene polymerization

2020 ◽  
Vol 909 ◽  
pp. 121075
Author(s):  
Marius I. Arz ◽  
Tim Kratky ◽  
Sebastian Günther ◽  
Katia Rodewald ◽  
Thomas Burger ◽  
...  
Keyword(s):  
Propene Polymerization

Structure-Activity Relationships for Bis(phenolate-ether) Zr/Hf Propene Polymerization Catalysts

2020 ◽  
Vol 2020 (6) ◽  
pp. 541-550
Author(s):  
Eric N. T. Cuthbert ◽  
Antonio Vittoria ◽  
Roberta Cipullo ◽  
Vincenzo Busico ◽  
Peter H. M. Budzelaar
Keyword(s):  
Polymerization Catalysts ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Propene Polymerization

ansa-Metallocenes Bearing 4-(N-Azolyl)-2-methylindenyl and Related Ligands: Development of Highly Isoselective Catalysts for Propene Polymerization at Higher Temperatures

2019 ◽  
Vol 38 (24) ◽  
pp. 4645-4657 ◽  
Author(s):  
Vyatcheslav V. Izmer ◽  
Artem Y. Lebedev ◽  
Dmitry S. Kononovich ◽  
Ilya S. Borisov ◽  
Pavel S. Kulyabin ◽  
...  
Keyword(s):  
Propene Polymerization

scholarly journals Sequential Immobilization of Ansa-Hafnocene Complexes for Propene Polymerization

2019 ◽  
Author(s):  
Marius Arz ◽  
Tim Kratky ◽  
Sebastian Günther ◽  
Katia Rodewald ◽  
Thomas Burger ◽  
...  
Keyword(s):  
Active Sites ◽  
Poor Performance ◽  
Reaction Conditions ◽  
Continuous Polymerization ◽  
Propene Polymerization ◽  
Close Proximity ◽  
Catalytically Active

We report the immobilization of the ultrarigid <i>ansa</i>-hafnocene complexes [Me<sub>2</sub>Si(Ind*)<sub>2</sub>HfCl<sub>2</sub>] (Ind* = 7,(3',5'-Di-<i>tert</i>-butylphenyl)-4-methoxy-2-methylindenyl) on silica as heteregeneous catalysts for propene polymerization. A sequential three-step synthesis on the siliceous surface led to pre-catalysts of the generalized structure SiO<sub>2</sub>-Si(Ind*)<sub>2</sub>HfCl<sub>2</sub>, which possess the silylene bridge of the substituted bis(indenyl) ligand directly attached to the surface. The immobilized pre-catalysts show very poor performance in the polymerization of propene, independent on the reaction conditions and the employed silica. Based on the results, we suggest that the close proximity of the catalyst to the surface combined with the steric congestion provoked by the ligand prevents a continuous polymerization, most likely due to a blockage of the catalytically active sites with growing polymer.<br>

scholarly journals Sequential Immobilization of Ansa-Hafnocene Complexes for Propene Polymerization

2019 ◽  
Author(s):  
Marius Arz ◽  
Tim Kratky ◽  
Sebastian Günther ◽  
Katia Rodewald ◽  
Thomas Burger ◽  
...  
Keyword(s):  
Active Sites ◽  
Poor Performance ◽  
Reaction Conditions ◽  
Continuous Polymerization ◽  
Propene Polymerization ◽  
Close Proximity ◽  
Catalytically Active

We report the immobilization of the ultrarigid <i>ansa</i>-hafnocene complexes [Me<sub>2</sub>Si(Ind*)<sub>2</sub>HfCl<sub>2</sub>] (Ind* = 7,(3',5'-Di-<i>tert</i>-butylphenyl)-4-methoxy-2-methylindenyl) on silica as heteregeneous catalysts for propene polymerization. A sequential three-step synthesis on the siliceous surface led to pre-catalysts of the generalized structure SiO<sub>2</sub>-Si(Ind*)<sub>2</sub>HfCl<sub>2</sub>, which possess the silylene bridge of the substituted bis(indenyl) ligand directly attached to the surface. The immobilized pre-catalysts show very poor performance in the polymerization of propene, independent on the reaction conditions and the employed silica. Based on the results, we suggest that the close proximity of the catalyst to the surface combined with the steric congestion provoked by the ligand prevents a continuous polymerization, most likely due to a blockage of the catalytically active sites with growing polymer.<br>

scholarly journals Propene Polymerization with C1-Symmetric Fluorenyl-Metallocene Catalysts

Polymers ◽  
2017 ◽  
Vol 9 (11) ◽  
pp. 581 ◽  
Author(s):  
Laura Boggioni ◽  
Massimiliano Cornelio ◽  
Simona Losio ◽  
Abbas Razavi ◽  
Incoronata Tritto
Keyword(s):  
Metallocene Catalysts ◽  
Propene Polymerization

Chain Transfer to Solvent in Propene Polymerization with Ti Cp-phosphinimide Catalysts: Evidence for Chain Termination via Ti–C Bond Homolysis

ACS Catalysis ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 7989-7993 ◽  
Author(s):  
Christian Ehm ◽  
Roberta Cipullo ◽  
Miriana Passaro ◽  
Francesco Zaccaria ◽  
Peter H. M. Budzelaar ◽  
...  
Keyword(s):  
Chain Transfer ◽  
Chain Termination ◽  
Propene Polymerization ◽  
Bond Homolysis
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