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Klein-Hessling, Christian; Blockhaus, Tobias and Sünkel, Karlheinz (2021): Serendipitous formation of the first eta(5)-tricyanocyclopentadienyl complex. Crystal and molecular structures of [{C5H4-nX(CN)(n)}Mn(CO)(2)PPh3] (X = Br, CN;n=1, 2). In: Inorganica Chimica Acta, Vol. 528, 120619

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The reaction of [(C5H4Br)Mn(CO)(2)PPh3] with lithium diisopropylamide and dimethylmalononitrile yields [{1,2-C5H3Br(CN)}Mn(CO)(2)PPh3] as main product. Further reaction with the same reagents leads to a complex product mixture, with the dicyanocymantrenes [{C5H2X(CN)(2)}Mn(CO)(2)PPh3] (X = H, Br) and the eta(5)-1,2,3-tricyanocyclopentadienyl complex [{C5H2(CN)(3)}Mn(CO)(2)PPh3] as main components. The crystal structures of these four main products were determined.

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