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The first diphosphacyclobutadiene with three-coordinate phosphorus could be stabilized as cobalt-complexed compound 3 by dimerization of the phosphaalkyne 1 in the presence of the cobalt complex 2. If 2 is present in excess, di- and tri-nuclear cobalt complexes are also formed, by coordination of the fragment [(C5H5)(C2H4)Co] to the P atoms of 3.
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Binger et al. (1986) studied this question.
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