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N , N ‐Diphospholylamines—A New Family of Ligands for Highly Active, Chromium‐Based, Selective Ethene Oligomerisation Catalysts
Author(s) -
Stennett Tom E.,
Hey Thomas W.,
Ball Liam T.,
Flynn Stephanie R.,
Radcliffe James E.,
McMullin Claire L.,
Wingad Richard L.,
Wass Duncan F.
Publication year - 2013
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201300306
Subject(s) - methylaluminoxane , catalysis , chemistry , selectivity , chromium , nuclear magnetic resonance spectroscopy , medicinal chemistry , polymer chemistry , stereochemistry , organic chemistry , metallocene , polymerization , polymer
A series of new diphosphazane (PNP) ligands that contain 2,3,4,5‐tetraethylphosphole or dibenzophosphole moieties has been synthesised. The new compounds have been screened for chromium‐catalysed, selective ethene oligomerisation by in situ combination with CrCl 3 (thf) 3 and methylaluminoxane (MAO). The ligands derived from 2,3,4,5‐tetraethylphosphole produce highly active catalysts for ethene oligomerisation, which show excellent selectivity to C 6 and C 8 linear α‐olefins. Complexes of the form [Cr(CO) 4 L] were synthesised and studied by IR spectroscopy and single‐crystal XRD. Variable‐temperature NMR spectroscopy was used to investigate restricted PN rotation in compounds with bulky nitrogen substituents.