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Yb(II) Triple-Decker Complex with the μ‑Bridging Naphthalene Dianion [CpBn5Yb(DME)]2(μ‑η44‑C10H8). Oxidative Substitution of [C10H8]2– by 1,4-Diphenylbuta-1,3-diene and P4 and Protonolysis of the Yb–C10H8 Bond by PhPH2

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journal contribution
posted on 13.07.2016, 07:03 by Alexander N. Selikhov, Tatyana V. Mahrova, Anton V. Cherkasov, Georgy K. Fukin, Evgueni Kirillov, Carlos Alvarez Lamsfus, Laurent Maron, Alexander A. Trifonov
Two synthetic approaches to the new three-decker Yb­(II) complex [CpBn5Yb­(DME)]2[μ-C10H8] (1) were successfully employed: the reaction of [CpBn5Yb­(DME)­(μ-I)]2 (2) with 2 molar equiv of [C10H8]·K in DME and the reaction of [YbI­(DME)2]2[μ-C10H8] (3) with CpBn5K in a 1:2 molar ratio in DME. Complex 1 was proved to be a Yb­(II) binuclear triple-decker complex containing a dianionic naphthalene ligand bridging two CpBn5Yb­(DME) fragments in a μ-η44 fashion. An oxidative substitution of (C10H8)2– by trans-(1E,3E)-1,4-diphenylbuta-1,3-diene afforded the three-decker Yb­(II) complex [CpBn5Yb­(DME)]2(μ-η44 -PhCHCHCHCHPh) (4) with a dianionic μ-η44-bridging diphenylbutadiene ligand and naphthalene. The reaction of 1 with excess P4 also occurs with oxidation of (C10H8)2–, whereas Yb remains divalent. The reaction results in the formation of the trinuclear Yb­(II) complex with a μ-bridging P73– ligand [CpBn5Yb­(DME)]3(P7) (5). Protonation of the Yb–C10H8 bond in 1 with PhPH2 (1:2 molar ratio) afforded the dimeric phosphido complex [CpBn5Yb­(THF)­(μ2-PHPh)]2 (6) in 64% yield, while an attempt to obtain a phosphinidene Yb­(II) species by reacting equimolar amounts of 1 and PhPH2 in DME resulted in the isolation of the metallocene complex CpBn52Yb­(DME) (7).