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Abstract
Abstract Oxidation of N , N , N ′, N ′-tetrakis(diphenylphosphino)ethylendiamine ( 1 ) with elemental sulfur and selenium gives the corresponding sulfide and selenide, respectively, [(Ph 2 P(E)) 2 NCH 2 CH 2 N(P(E)Ph 2 ) 2 ] (E: S 1a , Se 1b ). Complexes of 1 [(M 2 Cl 4 ){(Ph 2 P) 2 NCH 2 CH 2 N(PPh 2 ) 2 }] (M: Ni(II) 1c , Pd(II) 1d , Pt(II) 1e ) were prepared by the reaction of 1 with NiCl 2 or [MCl 2 (COD)] (M = Pd, Pt). The new compounds were characterized by NMR, IR spectroscopy and elemental analysis. The catalytic activity of Pd(II) complex 1d was tested in the Suzuki coupling reaction and Heck reaction. The palladium complex 1d catalyses the Heck reaction between styrene and aryl bromides as well as Suzuki coupling reaction between phenylboronic acid and arylbromides affording stilbenes and biphenyls in high yield, respectively.
Published Version
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