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The reactivity of the cubane‐type rare‐earth methylidene complex [Cp′Lu(μ3‐CH2)]4 (1, Cp′=C5Me4SiMe3) with various unsaturated electrophiles was investigated. The reaction of 1 with CO (1 atm) at room temperature gave the bis(ketene dianion)/dimethylidene complex [Cp′4Lu4(μ3‐CH2)2(μ3,η2‐O‐CCH2)2] (2) in 86 % yield through the insertion of two molecules of CO into two of the four lutetium–methylidene...
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