Nickelocene reacts with a rigid bisimidazolium salt to give cyclopentadiene and a biscarbene-bridged dinuclear nickel complex, which upon treatment with 4,4′-bipyridine and AgBF 4 yields the CpNi II -cornered molecular rectangle [ 1 ](BF 4 ) 4 .
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Hahn et al. (2008) studied this question.
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