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Silica‐Grafted Tris(neopentyl)aluminum: A Monomeric Aluminum Solid Co‐catalyst for Efficient Nickel‐Catalyzed Ethene Dimerization
Author(s) -
Moroz Ilia B.,
Florian Pierre,
VigerGravel Jasmine,
Gordon Christopher P.,
Lesage Anne,
Copéret Christophe
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202006285
Subject(s) - catalysis , chemistry , cationic polymerization , monomer , organometallic chemistry , tris , nickel , aluminium , polymer chemistry , chloride , heterogeneous catalysis , nuclear magnetic resonance spectroscopy , inorganic chemistry , organic chemistry , polymer , biochemistry
A silica‐supported monomeric alkylaluminum co‐catalyst was prepared via surface organometallic chemistry by contacting tris(neopentyl)aluminum and partially dehydroxylated silica. This system, fully characterized by solid‐state 27 Al NMR spectroscopy augmented by computational studies, efficiently activates ( n Bu 3 P) 2 NiCl 2 towards dimerization of ethene, demonstrating comparable activity to previously reported dimeric diethylaluminum chloride supported on silica. Three types of aluminum surface species have been identified: monografted tetracoordinated Al species as well as two types of bisgrafted Al species—tetra‐ and pentacoordinated. Of them, only the monografted Al species is proposed to be able to activate the ( n Bu 3 P) 2 NiCl 2 complex and generate the active cationic species.