Chelating and ‘pincer’ dicarbene complexes of palladium; synthesis and structural studiesElectronic supplementary information (ESI) available: crystallographic data and ORTEP plot for compound 5c. See http://www.rsc.org/suppdata/dt/b2/b209739g/
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- 30 January 2003
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Dalton Transactions
- No. 5,p. 1009-1015
- https://doi.org/10.1039/b209739g
Abstract
A series of ‘pincer’ 2,6-pyridyl dicarbene complexes of the type [(C–N–C)PdX]+, 4a, 4b, 2,6-lutidinyl dicarbene complexes of the type [(C⁁N⁁C)PdX]+, 4c, 4d, 1,3-xylyl dicarbene complexes of the type [(C⁁C⁁C)PdX], 5a,5b,5c and 1,2-xylyl dicarbene complexes [(CC)PdX2], 8, where carbene is 3-arylimidazol-2-ylidene, aryl = mesityl, 2,6-Pri 2C6H3, X = Br or Cl, have been prepared by (i) transmetallation from the corresponding silver complexes, i.e. [(C–N–C)Ag2Cl2], [(C⁁N⁁C)Ag2Cl2] and [(CC)Ag2Cl2] to palladium, (ii) substitution of cod in (cod)PdX2 by the ‘pincer’ (C–N–C) (iii) palladation of bis-imidazolium salts [C(H)⁁C(H)⁁C(H)] in the presence of base. The crystal structures show that the ligands act as chelates in 4–5, while in 8 as both chelate and bridging.Keywords
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