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- W1977133022 abstract "A trivalent chromium complex of a PN(pyridine) ligand system, {[(2,6-Ph2P-NH)2C5H3N]CrCl3}(THF)2 (1), was prepared and tested as a catalyst for ethylene oligomerization and polymerization, with the purpose of probing the ability of a pyridine ring substituent as a stabilizing factor on catalytically active intermediates. Its nonselective catalytic behavior indicated that ready reduction of the metal center to the divalent state occurred during the activation process. To substantiate this point, we have reacted 1 with a few common aluminate activators and isolated both the divalent complexes {[2,6-Ph2PNHC5H3NAlClEt2NPPh2]Cr(μ-Cl)2AlEt2}(toluene) (3) and {[2,6-Ph2PNHC5H3NAlCl-i-Bu2NPPh2]Cr(μ-Cl)2Al-i-Bu2}2 (toluene) (4) and the trivalent complexes {[2,6-Ph2PNHC5H3NAlClMe2NPPh2]CrMe(μ-Cl)2AlMe2}(toluene)1.5 (2) and {[2,6-Ph2PNHC5H3 NHNPPh2]CrEt(μ-Cl)2AlEt2}AlEtCl3(hexane)0.5 (5). The reaction of the ligand with the divalent chromium precursor CrCl2(THF)2 in the presence of alkylaluminum afforded {[2,6-Ph2PNHC5H3NCl2EtAlNPPh2]Cr(μ-Cl)2AlEt2}2(toluene) (6) containing aluminate residues, where the metal has preserved the initial divalent state. All of these species showed moderate to high activities toward ethylene oligomerization." @default.
- W1977133022 created "2016-06-24" @default.
- W1977133022 creator A5005231521 @default.
- W1977133022 creator A5026611636 @default.
- W1977133022 creator A5063225492 @default.
- W1977133022 date "2013-11-01" @default.
- W1977133022 modified "2023-10-14" @default.
- W1977133022 title "Synthesis, Structures, and Ethylene Oligomerization Activity of Bis(phosphanylamine)pyridine Chromium/Aluminate Complexes" @default.
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- W1977133022 doi "https://doi.org/10.1021/om4008289" @default.
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