Nucleophilic Attack on Coordinated Imines: The Synthesis of C‐Bonded Acetylacetonates of Palladium(II) and Mechanistic Insights

Abstract

The reactivity of complexes [PdCl2(κ2‐NN′)] [NN′ = 2‐C5H4N‐CH=N‐Ar; Ar = 2‐MeC6H4, a; 4‐MeC6H4, b; 2‐MeOC6H4, c; 4‐MeOC6H4, d; 4‐CF3C6H4, e; 2,6‐Me2C6H3, f; 2‐iPrC6H4, g] and [Pd(κ2‐acac)(κ2‐NN′)][BF4] toward the nucleophilic reagent acetylacetonate (acac) has been explored. This reaction starts with nucleophilic attack on the cabonylic atom of the coordinated imine generating a new C–C bond and an amido complex. The next step in the reaction is proton migration leading to the protonation of the amido nitrogen, and finally replacement of this coordinated nitrogen atom with an anionic carbon atom. The final consequence of the nucleophilic attack on the coordinated imines is the formation of new complexes and the generation of new C–C and C–Pd bonds.

Synthesis, Theoretical Study and Catalytic Application of Oxidometal (Mo or V) Complexes: Unexpected Coordination Due to Ligand Rearrangement through Metal‐Mediated C–C Bond Formation

“…Organic transformations of ligands involving the imine bond of transition metal complexes have generated renewed interest in recent years 60. Early reports by Golding and co‐workers have shown that acetylacetone can undergo a condensation with pyruvilidinatotetramminecobalt(III) ion 61.…”