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

Pörschke, Klaus-Richard

doi:10.1002/anie.198712881

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

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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: https://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.