2-phosphanylphenolate nickel catalysts for the polymerization of ethylene |
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Authors: | Heinicke Joachim Köhler Martin Peulecke Normen He Mengzhen Kindermann Markus K Keim Wilhelm Fink Gerhard |
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Affiliation: | Institut für Chemie und Biochemie, Ernst-Moritz-Arndt-Universit?t Greifswald, Soldmannstrasse 16, 17487 Greifswald, Germany. heinicke@uni-greifswald.de |
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Abstract: | The previously unknown methallylnickel 2-diorganophosphanylphenolates (R=Ph, cHex) were synthesized and found to catalyze the polymerization of ethylene. To explore the potential for ligand-tuning, a variety of P-alkyl- and P-phenyl-2-phosphanylphenols was synthesized and allowed to react with [Ni(cod)(2)] (cod=1,5-cyclooctadiene) or with NiBr(2).DME and NaH. The complexes formed in situ with [Ni(cod)(2)] are generally active as ethylene polymerization catalysts with all the ligands tested, whereas the latter systems are inactive when 2-dialkylphosphanylphenols are applied. M(w) values, ranging from about 1000 to about 100000 g mol(-1), increase for various R(2)P groups in the order R=Ph
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Keywords: | chelates homogeneous catalysis nickel O,P ligands polymerization |
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