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Journal Article

Coupling of Two Ethyne Molecules at a Nickel Center to Form a Nickelacyclopentadiene Complex

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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

Pörschke, K.-R. (1987). Coupling of Two Ethyne Molecules at a Nickel Center to Form a Nickelacyclopentadiene Complex. Angewandte Chemie International Edition, 26(12), 1288-1290. doi:10.1002/anie.198712881.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-BF50-F
Abstract
The Ni-catalyzed cyclooligomerization of acetylene according to Reppeprobably proceeds stepwise via a nickelacyclopentadiene intermediate. By reaction of 1 with ethyne in excess and iPr2PCH2CH2PiPr2 in pentane at −78°C (!) it has now been possible for the first time to obtain a NiC4H4-complex via 2 and to characterize it IR and NMR spectroscopically. In the formula of 2 on the right a Ni(iPr2PCH2CH2PiPr2) unit has been omitted.