| Abstract
| - Complex [{(η5-C5H3)2(SiMe2)2}Ru2(CO)4(μ-H)]+BF4- (1H+BF4-), which features a protonated Ru−Ru bond,reacts with F- to give (η5-C5H5)2Ru2(CO)4 (2), resulting from the cleavage of both SiMe2 groups, with I- to givethe Ru−Ru cleaved product {(η5-C5H3)2(SiMe2)2}Ru2(CO)4(H)(I) (3), and with phosphines (PEt3, PMe2Ph) togive [{(η5-C5H3)2(SiMe2)2}Ru2(CO)4(H)(PR3)]+ (4a−b). Reaction of 1H+BF4- and NaOMe in THF generates{(η5-C5H4)2SiMe2}Ru2(CO)4 (5), resulting from the cleavage of a single SiMe2 group, while the reaction of1H+BF4- and NaOMe in MeOH generates {μ-η5:η5-(C5H3SiMe2OMe)(C5H4)SiMe2}Ru2(CO)4 (6), resulting fromthe partial cleavage of a SiMe2 group. Reaction of 1H+BF4- and NaSR (R = Me, Et) in THF generates {(η5-C5H3)2(SiMe2)2}Ru2(CO)4(H)(SR) (R = Me, Et; 7a−b), which undergoes rearrangement upon contact with neutraland basic alumina or silica to give complexes {μ-η5:η1:η5-(C5H3CO)(C5H4)(SiMe2)2O}Ru2(μ-SR)(CO)3 (R =Me, Et; 8a−b). Molecular structures of 4a, 6, and 8a as determined by X-ray diffraction studies are also presented.
- [{(η5-C5H3)2(SiMe2)2}Ru2(CO)4(μ-H)]+BF4- (1H+BF4-) reacts with nucleophiles (halide anions, nucleophilic phosphines, -OMe, -SMe) to give a variety of new complexes resulting from nucleophilic addition to the Ru or to the Si atom of the linking (η5-C5H3)2(SiMe2)2 ligand.
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