Formation of (σ-Alkenyl)- and (μ-Vinylidene)palladium and -platinum Complexes by Oxidative Addition of 4,4-Dichloro-1,1-diphenyl-2-azabuta-1,3-diene − The Molecular Structure of an Unusual Asymmetric (μ-Vinylidene)Pd−Pd Complex

• Published in: European journal of inorganic chemistry Vol. 2003; no. 3; pp. 514 - 517
• Main Authors: Knorr, Michael, Schmitt, Gérard, Kubicki, Marek M., Vigier, Estelle
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.02.2003; WILEY‐VCH Verlag
• Subjects: Metal-metal interactions; Palladium; Platinum; Vinylidene ligands
• ISSN: 1434-1948; 1099-0682
• DOI: 10.1002/ejic.200390073

4,4‐Dichloro‐1,1‐diphenyl‐2‐azabuta‐1,3‐diene (1) oxidatively adds to [Pd(PPh3)4] and [Pt(C2H4)(PPh3)2] giving rise to the σ‐alkenyl complexes trans‐[MCl{[C(Cl)=C(H)−N=CPh2]}(PPh3)2] (2a: M = Pd; 2b: M = Pt). When 1 is treated with [Pd(PPh3)4] in a 1:2 ratio in refluxing toluene, the dimetallic μ‐vinylidene complex [(PPh3)ClPd{μ‐[C=C(H)−N=CPh2]}PdCl(PPh3)2] (3) is formed. In this fluxional compound, a PPh3 ligands migrates in a reversible manner between the two Pd centers. Substitution of the PPh3 ligands of 3 by 2 equiv. of Ph2PCH2PPh2 affords the A‐frame complex [ClPd(μ‐dppm)2{μ‐[C=C(H)−N=CPh2]}PdCl] (4). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)