Synthesis and reactivity of new methylallylpalladium(II) complexes with bidentate 2-(methylthio-N-benzylidene)anilines
作者:Raúl Contreras、Bárbara Loeb、Mauricio Valderrama、Mario Lagos、Francisco Burgos、Paola Ramı́rez、Javier Concepción
DOI:10.1016/j.jorganchem.2003.10.028
日期:2004.1
This work describes the synthesis, characterisation and reactivity of new methylallyl Pd(II) complexes that contain bidentate 2-(methylthio-N-benzylidene)anilines as ligands. The reaction of the binuclear complex [(eta(3)-Me-allyl)Pd(mu-Cl)(2)] with AgBF4 causes the total abstraction of the chloride bridges, with the subsequent formation of an intermediary fragment of Pd(II). This fragment in turn reacts with neutral bidentate 2-(methylthio-N-benzylidene)anilines to give cationic complexes of Pd(II) of general formula [(eta(3)- Me-allyl)Pd(eta(2)-S,N-MeSC6H4N=CHC6H4(X)Y)]BF4 [X = H, Y = H (1); X = F, Y = H (2); X = Me, Y = H (3); X = H, Y = Cl (4); X = H, Y = Me2N (5); X = H, Y = NO, (6)]. The new complexes were characterised by means of elemental analysis, IR, NMR [H-1, F-19H-1}, C-13H-1}, P-31H-1}, Dept, H-1-H-1-COSY, HSQC HMBC] and mass spectroscopies. The reaction of the Pd(II) complexes with nucleophiles such as NaI, (EtO)(2)PS2K, KCN, KSCN or NaH lead to the deco-ordination of the bidentate ligands to give dimeric or polymeric complexes of Pd(II). The reactivity pattern observed is discussed by a theoretical analysis based on Fukui functions. (C) 2003 Elsevier B.V. All rights reserved.