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Issue 20, 2020
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Synthesis and reactivity of cyclobutadiene nickel bromide

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NiBr2 reacts with 3-hexyne in the presence of Mg and EtOH to give the cyclobutadiene bromide complex [(C4Et4)NiBr2]2, which serves as a general precursor for various cyclobutadiene nickel compounds. In particular, complexes with 2-electron ligands (C4Et4)Ni(L)Br2 (L = PPh3, P(OMe)3, pyridine), complexes with bidentate ligands [(C4Et4)Ni(L2)Br]PF6 (L2 = bipyridine, phenanthroline), and nickelacarborane (C4Et4)NiC2B9H11 were obtained from [(C4Et4)NiBr2]2 in 70–95% yields. The reactions of [(C4Et4)NiBr2]2 with an excess of strong ligands, such as tBuNC or dppe, led to the displacement of cyclobutadiene. The structures of the five compounds have been established by X-ray diffraction analysis. The previously reported data on cyclobutadiene nickel complexes have been also reviewed.

Graphical abstract: Synthesis and reactivity of cyclobutadiene nickel bromide

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Article information

24 Apr 2020
29 Apr 2020
First published
30 Apr 2020

Dalton Trans., 2020,49, 6801-6806
Article type

Synthesis and reactivity of cyclobutadiene nickel bromide

N. V. Shvydkiy, E. A. Dlin, K. V. Ivanov, A. G. Buyanovskaya, Y. V. Nelyubina and D. S. Perekalin, Dalton Trans., 2020, 49, 6801
DOI: 10.1039/D0DT01510E

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