The reaction of biruthenocene with excess p -benzoquinone and boron trifluoride−diethyl ether produced the title complex ( 1 ) in good yield. Single-crystal X-ray analysis revealed that 1 is the Ru−fulvalene complex with the novel coordination mode μ 2 -η 6:η 6 . The reaction of 1 with Br 2 and PPh 3 in CH 3 NO 2 gave cations formulated as [BrCpRu IV FvRu IV CpBr] 2+ ( 2 ) and CpRu II FvRu II (C 5 H 4 P + Ph 3 ) ( 3 ), respectively.
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Watanabe et al. (1999) studied this question.
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