Abstract
Brookhart-type catalytic systems based on zero-valent nickel complexes Ni(COD)2 and Ni(COD)L [where COD is cyclooctadiene and L is bis-2,6-diisopropylphenyl-diazabutadiene (DPP-DAB) or N,N′-bis-2,6- diisopropylphenyl-bis-iminoacenaphthene (DPP-BIAN)] activated with Lewis acids such as methylaluminoxane (MAO) and boron trifluoride etherate BF3·OEt2 were investigated via electron spin resonance (ESR) spectrometry, revealing that presence of diimine ligand results in Lewis acids, formally oxidating Ni(0) to Ni(I). An oxidation mechanism is proposed.
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The authors are grateful to the Russian Foundation for Basic Research (RFBR) (Research Grant No. 16-33-00512) for Financial Support.
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Gurinovich, N.S., Petrovsky, S.K., Saliy, I.V. et al. Influence of a diimine ligand and an activator on the processes taking place in Brookhart-type nickel catalytic systems. Res Chem Intermed 44, 1935–1944 (2018). https://doi.org/10.1007/s11164-017-3207-x
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DOI: https://doi.org/10.1007/s11164-017-3207-x