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The title compounds were prepared from monolithio- and dilithioferrocene, respectively using tetrakis[iodo(tris-n-butyl-phosphinecopper(I)] in dimethoxyethane (DME) with an oxidative work up. If a 2:3 mixture of the lithium reagents was used, small amounts of terferrocene (6%) and quaterferrocene (3%) were isolated in addition to biferrocene and bisfulvalene diiron (BFDFe).
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