Cationic Organomagnesium Complexes as Highly Active Initiators for the Ring-Opening Polymerization of ε-Caprolactone

Cationic Organomagnesium Complexes as Highly Active Initiators for the Ring-Opening Polymerization of ε-Caprolactone

Species of the form [LH]+[BR4]− (R = pentafluorophenyl, phenyl, 1) were synthesized by reaction of Brönsted acids with a novel bis-phosphinimine ligand (L = 4,6-(MesNPPh2)2dibenzofuran). Corresponding cationic complexes [LMg n Bu]+[BR4]− (2) were produced by reaction of [Mg n Bu2] with [LH]+[BR4]−...

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Veröffentlicht in:Organometallics 2010-03, Vol.29 (5), p.1079-1084
Hauptverfasser: Ireland, Benjamin J, Wheaton, Craig A, Hayes, Paul G
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creator Ireland, Benjamin J
Wheaton, Craig A
Hayes, Paul G
description Species of the form [LH]+[BR4]− (R = pentafluorophenyl, phenyl, 1) were synthesized by reaction of Brönsted acids with a novel bis-phosphinimine ligand (L = 4,6-(MesNPPh2)2dibenzofuran). Corresponding cationic complexes [LMg n Bu]+[BR4]− (2) were produced by reaction of [Mg n Bu2] with [LH]+[BR4]−. Organomagnesium species 2a and 2b exhibit extremely high activity as initiators for the polymerization of ε-caprolactone, yielding near-quantitative conversion of monomer to high molecular weight (>2.0 × 105 g/mol) polymer in 4 min at ambient temperature.
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title Cationic Organomagnesium Complexes as Highly Active Initiators for the Ring-Opening Polymerization of ε-Caprolactone
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