199681-86-2Relevant academic research and scientific papers
New open tetraaza nickel(II) and palladium(II) complexes. Different reactivity of the electrogenerated M(0) species toward difunctional substrates
Gómez, Montserrat,Muller, Guillermo,Panyella, David,Rocamora, Mercè,Du?ach, Elisabet,Olivero, Sandra,Clinet, Jean-Claude
, p. 5900 - 5908 (1997)
A series of neutral and cationic Ni(II) and Pd(II) complexes with the open tetraaza ligand bisoxazoline bisamine N4, were prepared and characterized. Neutral complexes presented dimeric structures of stoichiometry [M2(μ-N4)X4] (M = Ni (1), Pd (2)) and underwent slow decomplexation in coordinating solvents. Cationic monomeric [M(N4)]Y2 (M = Ni (3), Pd (4)) compounds were stable in solution and were efficient catalysts in electrochemical reactions involving difunctional substrates, unsaturated o-haloaryl and o-halobenzyl ethers. [Ni(N4)]2+-catalyzed reactions led to intramolecular cyclization products via initial oxidative addition on the C-X bond, whereas [Pd(N4)]2+-catalyzed processes involved the cleavage of the C-O bond. Furthermore, organometallic σ-Ni(II) (7a,b) and π-allylpalladium(II) (8a,b) complexes were prepared in order to study the intermediate species proposed in the catalytic cycles.
