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The First Triple-Decker Complex with a Carbenium Center, [CpCo(μ-C 3 B 2 Me 5 )RuC 5 Me 4 CH 2 ] + : Synthesis, Reactivity, X-Ray Structure, and Bonding.

The first derivative of the methylium cation with the triple-decker substituent, [CpCo(C3 B2 Me5 )RuC5 Me4 CH2 ]PF6 (2PF6 ), was synthesized from the reaction of the triple-decker complex CpCo(C3 B2 Me5 )RuCp* (1) with the salt of the trityl cation [CPh3 ]+ . The X-ray crystal structure of 2PF6 reveals that the methylium carbon is bound to the ruthenium with Ru-C bond length of 2.259 Å and corresponds to the description of its structure as η6 -fulvene-ruthenium. Reactions of 2PF6 with nucleophiles OH- , Ph3 P, Et3 N led to the corresponding derivatives of 1 in high yields. Aromatic amines PhNEt2 and 4-MeC6 H4 NH2 react with 2PF6 to give the electrophilic aromatic substitution products quantitatively. Chemical reduction of 2PF6 with Zn powder in tetrahydrofuran leads to the formation of the bis(triple-decker) derivative (CpCo(C3 B2 Me5 )RuC5 Me4 CH2 )2 (10) with a CH2 CH2 -bridge. The structures of complexes 4, 7-10 were determined by X-ray diffraction. Density functional calculations support the crystallographically determined geometry of 2 and allow rationalization of some characteristics of its structure, spectroscopy, and reactivity.

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