Homoleptische Carbenkomplexe, IV. Tetrakis(N-alkylimidazolin-2-yliden)palladium and -platin/Homoleptic Carbene Complexes, IV. Tetrakis(N-alkylimidazolin-2-ylidene)palladium and -platinum
Open Access
- 1 January 1992
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B
- Vol. 47 (1) , 79-89
- https://doi.org/10.1515/znb-1992-0116
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.Keywords
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