Lithium chloride-induced dissociation of cyclopalladated ligands from chloro(ligand-C,N)triphenylphosphinepalladium(II) complexes in acetic acid solvent

Add time:07/28/2019    Source:sciencedirect.com

The chloro(ligand-C,N)triphenylphosphinepalladium(II) complexes with cyclopalladated N,N-dialkylbenzylamines (alkyl = methyl, ethyl and n-propyl), azobenzene, 8-methylquinoline, dimethylaminomethylferrocene and 2-benzylpyridine undergo lithium chloride-induced solvolysis in acetic acid solvent usually at 80°C to afford the corresponding non-palladated ligands and the poorly soluble, dinuclear complex [PdCl2(PPh3)]2. The reactivity pattern for N,N-diethylbenzylamine derivative II provides evidence that the reaction proceeds in two steps. The first step is palladium—nitrogen bond cleavage to afford the dechelated, σ-bonded zwitterionic complex cis-[PdCl2(C6H4CH2NHEt2)(PPh3)], and the second step is protonolysis of the palladium—carbon bond by acetic acid to yield the final products.

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