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Elimination of tellurium from the niobocene complex 1, which contains the novel η2-Te2H ligand, leads to the title compound 2 under the action of [Cr(CO)5(thf)]. Characteristic for the structure of 2 is the folded four-membered ring in which all adjacent Cr(CO)5 fragments are in a trans arrangement.
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Blacque et al. (1997) studied this question.
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