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- W2118542252 abstract "Abstract Pincer compounds containing a central pyrrole linked through methylene groups in the 2,5-positions to two N-imidazole, N-pyrazole and N-1,2,4-triazole heterocyles have been prepared via a common quaternary amine precursor. Alkylation of the imidazole groups using methyl iodide or benzyl bromide gave imidazolium compounds. The methylated iodide salt was characterised crystallographically, showing significant pyrrole I⋯HN, imidazolium I⋯HC and imidazolium I⋯(sp2-C) interactions leading to a U-shaped conformation of the cationic pincer compound. The alkylated cations which were investigated as precursors to pyrrole-carbene pincer ligands, but all attempts to either coordinate palladium or deprotonate using silver oxide led to cleavage of the heterocycles from the central pyrrole. The result was the formation of palladium and silver complexes containing 3-N-methylimidazole (3-N-MeIm) or 3-N-benzylimidazole (3-N-BzIm) ligands: (3-N-MeIm)PdI2, (3-N-MeIm)PdCl2 and [(3-N-MeIm)2Ag]I, with the (3-N-MeIm)PdI2 complex characterised by crystallography. Pyrazole, 3,5-dimethylpyrazole and 1,2,4-triazole pincer compounds were prepared, the latter characterised by a molecular structure determination. The pyrazole and 1,2,4-triazole pincers coordinate directly to palladium through the deprotonated central pyrrolyl and neutral N-donors on the flanking heterocycles." @default.
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- W2118542252 date "2014-10-01" @default.
- W2118542252 modified "2023-10-16" @default.
- W2118542252 title "Pyrrole pincers containing imidazole, pyrazole and 1,2,4-triazole groups" @default.
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- W2118542252 doi "https://doi.org/10.1016/j.ica.2014.07.022" @default.
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