American Chemical Society
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Versatile Behavior of the Schiff Base Ligand 2,5-Me2C6H3C(H)N(2,4,6-Me3C6H2) toward Cyclometalation Reactions: C(sp2,phenyl)−H vs C(sp3,methyl)−H Activation

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posted on 2010-08-09, 00:00 authored by Digna Vázquez-García, Alberto Fernández, Margarita López-Torres, Antonio Rodríguez, Nina Gómez-Blanco, Carlos Viader, José M. Vila, Jesús J. Fernández
Treatment of the Schiff base ligand a with palladium(II) acetate in toluene gave 1a, with metalation of an aromatic phenyl carbon atom. Reaction at room temperature gave the trinuclear complex 4a. Treatment of a with palladium(II) acetate in refluxing acetic acid gave 1a′. The reaction of complexes 1a and 1a′ with sodium chloride or lithium bromide gave the halogen-bridged complexes 2a, 3a, 2a′, and 3a′.