A solution-phase route to a tetraethynylated (cyclobutadiene)cyclopentadienylcobalt complex with a para-(1,3,2,4)-substitution patternElectronic supplementary information (ESI) available: experimental, including details of preparation and spectroscopic characterization of all new compounds. See http://www.rsc.org/suppdata/cc/b1/b109848a/

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