Surface organometallic chemistry: a route to well-defined boron heterogeneous co-catalyst for olefin polymerisation

Surface organometallic chemistry: a route to well-defined boron heterogeneous co-catalyst for olefin polymerisation

The reaction of tris(pentafluorophenyl)borane, B(C6F5)3 with surface silanol (=Si-OH) of silica occurs only in the presence of a Bronsted base (diethylaniline, Et2NPh), which does not form a complex with B(C6F5)3, and affords selectively a well-defined ionic entity [=SiO-B(C6F5)3]-[HNEt2Ph]+. With a...

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Veröffentlicht in:Comptes rendus. Chimie 2004-08, Vol.7 (8-9), p.725-736
Hauptverfasser: Millot, Nicolas, Santini, Catherine C., Lefebvre, Frédéric, Basset, Jean-Marie
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container_issue 8-9
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container_title Comptes rendus. Chimie
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creator Millot, Nicolas
Santini, Catherine C.
Lefebvre, Frédéric
Basset, Jean-Marie
description The reaction of tris(pentafluorophenyl)borane, B(C6F5)3 with surface silanol (=Si-OH) of silica occurs only in the presence of a Bronsted base (diethylaniline, Et2NPh), which does not form a complex with B(C6F5)3, and affords selectively a well-defined ionic entity [=SiO-B(C6F5)3]-[HNEt2Ph]+. With a strong nucleophile base such as pyridine (C5H5N), the complex (C6F5)3B.NC5H5 is formed and is only physisorbed onto silica surface. Without a base, B(C6F5)3 does not react with (=Si-OH), and is only physisorbed. On the contrary, with any molecular compound ROH, B(C6F5)3 forms a stable complex (C6F5)3BO(H)R.
doi_str_mv 10.1016/j.crci.2004.03.011
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title Surface organometallic chemistry: a route to well-defined boron heterogeneous co-catalyst for olefin polymerisation
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