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tmeda-Nickel-Komplexe: I. (tmeda)Ni(η2-C4H6)2 und {(tmeda)Ni(η2C4H6)}222-C4H6)

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons58898

Pörschke,  Klaus-Richard
Research Group Pörschke, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Schröder, W., & Pörschke, K.-R. (1987). tmeda-Nickel-Komplexe: I. (tmeda)Ni(η2-C4H6)2 und {(tmeda)Ni(η2C4H6)}222-C4H6). Journal of Organometallic Chemistry, 322(3), 385-392. doi:10.1016/S0022-328X(00)99366-5.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-B8EC-D
Abstract
Tris(ethene)nickel(0) reacts with tmeda and butadiene in ether below −40°C to yield a deep-red solution of (tmeda)Ni(η2-C4H6)2 (3a), from which red crystals of the thermolabile dinuclear complex {(tmeda)Ni(η2-C4H6)}222-C4H6) (3b) can be separated. Results in the formation of mononuclear 3a, which also forms upon dissociation of 3b in solution, was identified from its 1H and 13C NMR spectra. Above −40°C, 3a,b decompose in solution, which coupling of the butadiene ligands to afford Ni(η332-C12H18), which was shown to be an intermediate of the nickel-catalyzed cyclotrimerisation reaction of butadiene. Thus 3a,b are the first butadiene complexes of nickel that are catalytically active despite the presence of stabilizing ligands.