Fast palladium catalyzed arylation of alkenes using bulky monodentate phophorous ligands

Abstract

[EN] The new bimetallic nickel(II) compound (PPh4)4[Ni2(2)]·6H2O (3), where H8[2] stands for N,N',N'',N'''-1,2,4,5-benzene-tetrayltetrakis(oxamic acid), has been synthesized and its crystal structure determined by single-crystal X-ray diffraction. The structure of 3 consists of [Ni2(n4:n4-2)]4- anions, tetraphenylphosphonium cations, and water molecules. Facile one-electron oxidation of the square-planar diamagnetic dinickel(II) complex [Ni2(n4:n4-2)]4- generates the metallo-radical species [Ni2(n4:n4-2·+)]3- with characteristic intra-ligand ¿cation radical transitions in the visible region (475-550 nm) as well as a typical quasi-isotropic EPR signal at g ¿ 2.0.This work was supported by the CNRS (France) and the DGICYT (Spain) through project PB9421002. B. Cervera thanks the Conselleria de Educació i Ciència de la Generalitat Valenciana (Spain) for a grant.Aukauloo, A.; Ottenwaelder, X.; Ruiz, R.; Poussereau, S.; Pei, Y.; Journaux, Y.; Fleurat, P.... (1999). 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