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Article Dans Une Revue Dalton Transactions Année : 2017

A convenient access to N-phosphonio-substituted NHC metal complexes [M = Ag(i), Rh(i), Pd(ii)]

Résumé

A series of NHC pre-ligands featuring a pendant phosphonium moiety attached to N[prime or minute] position through a propyl linker was readily obtained upon quaternization of N-mesityl- and N-methyl-imidazole, or N-mesityl-imidazoline using (3-bromo-propyl)-triphenylphosphonium bromide. Reactions of the resulting dicationic salts with [PdCl(allyl)]2 in the presence of K2CO3 afforded the anticipated NHC-ligated Pd(ii) metal complexes in high yields. Further treatment of the latter complexes with tBuOK induced a deprotonation of the carbon atom adjacent to the phosphonium moiety and the formation of the corresponding C,C-chelating NHC-phosphonium ylide Pd(ii) complexes. Investigation of an alternative synthetic route involving a silver transmetallation reaction incidentally allowed isolation and full characterization of an unusual dimeric tetranuclear NHC Ag(i) complex of general formula [(NHC[similar]P+)2(Ag4Br6)2-].
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Dates et versions

hal-01938388 , version 1 (28-11-2018)

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Idir Benaissa, Rachid Taakili, Noël Lugan, Yves Canac. A convenient access to N-phosphonio-substituted NHC metal complexes [M = Ag(i), Rh(i), Pd(ii)]. Dalton Transactions, 2017, 46 (36), pp.12293-12305. ⟨10.1039/C7DT02759A⟩. ⟨hal-01938388⟩
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