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A protecting wall for low-coordinate metal centers, reinforced by agostic interactions, is provided by a rigid cyclic (alkyl)(amino)carbene ligand (CAAC), as shown by the preparation of [RhCl(CO)(CAAC)] and [Pd(All)(CAAC)]+BF4− complexes (All=allyl). The former is related to the active species of Wilkinson's catalyst, and the latter is the first isolated cationic, formally 14-electron PdII species.
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Lavallo et al. (2005) studied this question.
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