Ten palladium and platinum complexes each containing two chelating bis(diaminocarbene) ligands have been synthesized in a one pot-reaction from PdI2, PtI2 or K2PtCl4, a tenfold excess (forty equivalents) of isocyanide and 1,2- or 1,3-diamines. An X-ray investigation of (8) revealed a stereochemistry with the two spiro-linked seven-membered metallacycles strongly bending out of the PtC4 coordination plane in opposite directions. In addition, three palladium bis-chelates with mixed amine/carbene bidentate ligands were obtained from reactions of PdI2 with only four equivalents of isocyanide and the diamine.
Rigid Bidentate Nitrogen Ligands in Organometallic Chemistry and Homogeneous Catalysis. 6. Zerovalent Palladium and Platinum Complexes Containing Rigid Bidentate Nitrogen Ligands and Alkenes: Synthesis, Characterization, Alkene Rotation and Substitution Reactions. X-ray Crystal Structure of [Bis((2,6-diisopropylphenyl)imino)acenaphthene](maleic anhydride)palladium(0)