The complexes [π-C 6 H 6 RuX 2 ] 2 (X = Cl, Br, I, SCN) have been prepared and characterized. They react with phosphorus donors to give the monomeric π-C 6 H 6 RuX 2 PR 3 , and with cyanide and hydride ions to give cyclohexadienyl and cyclohexadiene complexes.
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Zelonka et al. (1972) studied this question.