| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1308674 | Inorganica Chimica Acta | 2015 | 6 Pages |
•Annulated NHC ligand.•Pyridine wingtip NHC.•Pd(II)–NHC complexes.•Suzuki coupling reaction.
The annelated imidazolium salt 1-methyl-2-(pyridin-2-yl)imidazo[1,5-a]pyridin-4-ylium hexaflurophosphate (1·HPF6) has been synthesized by via formylative cyclization of the corresponding Schiff base 2-acetylpyridyl-N-(2-pyridyl)methylamine using standard conditions followed by anion metathesis with NH4PF6. Reaction of 1·HPF6 with silver oxide and palladium chloride led to the formation of the palladium complex [Pd(1)2Cl]PF6, 2. Subsequent reaction of 2 with AgPF6 gave the palladium complex [Pd(1)2][PF6]2, 3. The complexes have been fully characterized by different spectroscopic techniques and finally the solid state structures of 2 and 3 have been determined by single crystal X-ray diffraction studies. The catalytic activities of 2 and 3 have been tested in the Suzuki–Miyaura coupling reactions of several activated para-functionalized aryl bromides with phenyl boronic acid to find that 2 is slightly more efficient than 3.
Graphical abstractSynthesis, structural characterizations and catalytic activities of two novel Pd(II)–NHC complexes based on C, N donor annelated NHC are highlighted.Figure optionsDownload full-size imageDownload as PowerPoint slide
