Oxidative addition of diferrocenyl dichalcogenides to [{Ru(η 5 -C 5 Me 5 )(µ 3 -Cl)} 4 ]. Syntheses, crystal structures and some reactivities of [{Ru(η 5 -C 5 Me 5 )Cl(µ-ER)} 2 ](E = S, Se or Te; R = ferrocenyl)

Reaction of [{Ru(η5-C5Me5)(µ3-Cl)}4] with 2 equivalents of REER (E = S, Se or Te; R = ferrocenyl) gave novel ferrocenylchalcogenolate-bridged diruthenium complexes [{Ru(η5-C5Me5)Cl(µ-ER)}2] in good yields. Reduction of these by sodium amalgam in the presence of buta-1,3-diene afforded [{Ru(η5-C5Me5)(µ-ER)}2(µ-s-trans-η2:η2′-CH2CHCHCH2)], whereas treatment with AgOSO2CF3 produced the co-ordinatively unsaturated complexes [Cl(η5-C5Me5)Ru(µ-ER)2 Ru(η5-C5Me5)][OSO2CF3]. The structures of five of the complexes have been defined by X-ray crystallography.