No abstract

In the multi-functionalized ionic liquid compositions (MFILC), composed of 1-n-butyl-2-diphenylphosphino-3-methylimidazolium hexafluorophosphate, [BDPPMIM]PF6), 1-(2-piperid-1-yl-ethyl)-3-methylimidazolium hexafluorophosphate, [PEMIM]PF6), and 1-nbutyl-3-methylimidazolium hexafluorophosphate ([BMIM] PF6), PdCl2 served as an efficient catalyst for Heck reactions of aryl iodides and bromides. The built-up PdCl2-MFILC, including stoichiometrically consumed base of [PEMIM]PF6, could be reused at least for seven cycles without activity loss.

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The ionic palladium porphyrin featured with pyridinium tags at four meso-positions, palladium tetrakis-(N-methyl-4-pyridinium)-porphyrin iodide ([Pd(II)TMPy)P][I] 4 (3), embedded in the similar structured ionic liquid of N-butyl pyridinium tetrafluoroborate ([Bpy]BF 4 ) was found to be a highly efficient and recyclable catalytic system for the Heck cross-coupling of iodobenzene (derivatives) and ethyl acylate, with high turnover frequency of 56,000 h -1 under aerobic conditions. The active charge transfer transition occurred in 3-[Bpy]BF 4 system during the Heck reaction could account for the efficiency in the catalytic coupling, which was observed in the UV-visible spectra.

No abstract