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Klein-Hessling, Christian and Sünkel, Karlheinz (2022): (η4-Tetraphenylcyclobutadiene)-(η5-pentaphenylcyclopentadienyl)-cobalt. In: Molbank, Vol. 2022, No. 4, M1502

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A one-pot reaction starting with C5Ph5Br, n-BuLi and [CoCl(PPh3)(3)] followed by the addition of diphenylethyne produces the title compound with 12% yield. Spectroscopic characterization involved H-1, C-13-NMR, UV-Vis and mass spectrometry. A crystal structure determination showed that the central aromatic rings are exactly parallel with the cyclobutadiene ring further apart from the metal as usual. The pentaphenyl-cyclopentadienyl ligand shows an usual paddlewheel orientation, whereas in the tetraphenyl-cyclobutadiene ligand, two of the phenyl groups are nearly coplanar with the four-membered ring. There are also numerous C-H... C(pi) interactions between the phenyl groups on the same ring, as well as between rings.

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