No abstract

Homoleptic complexes of palladium and platinum containing carbenoid imidazole ligands (1, 12-19 ) have been synthesized either directly from C2-lithiated N-methyl-imidazole and Pdl2 or, indirectly (and more efficiently), from isocyanides and 2-am inoacetaldehyde diethylacetale in the presence of Pdl2, Ptl2 or K2PtCl4 via the respective “ open chain” diaminocarbenes 2-11. Selected IR , NMR (1H , 13C), and pos-FAB mass spectrometric data of the new compounds are reported. The X-ray structure analysis of tetrakis(N -methylimidazolin-2-ylidene)palladium-diiodide (lb ) reveals a geometry of the heterocyclic ligands which deviates considerably from the one expected for extensive 6π-electron delocalization across the ring.