Well-defined PEPPSI-themed palladium–NHC complexes: synthesis,and catalytic application in the direct arylation of heteroarenes |
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Authors: | Murat Kaloğlu Nevin Gürbüz İlkay Yıldırım Namık Özdemir İsmail Özdemir |
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Institution: | 1. Faculty of Science and Arts, Department of Chemistry, İnönü University, 44280 Malatya, Turkey;2. Vocational School of Health Services, Department of Radiotherapy, Biruni University, 34010 İstanbul, Turkey;3. Faculty of Education Department of Mathematics and Science Education, Ondokuz Mayıs University, 55139 Samsun, Turkey |
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Abstract: | In this study, a series of benzimidazolium salts were synthesized as unsymmetrical N-heterocyclic carbene (NHC) precursors. Benzimidazolium salts were used for synthesis of the PEPPSI (pyridine enhanced precatalyst preparation stabilization and initiation)-themed, six new Pd-complexes with the general formula PdX2(NHC)(pyridine)]. The structures of all compounds were characterized by various spectroscopic techniques such as 1H NMR, 13C NMR and FT-IR. The more detailed structural characterization of four of the complexes was determined by single-crystal X-ray diffraction study. The catalytic activities of all Pd-complexes were evaluated in the direct arylation of the 2-acetylfuran and 2-acetylthiophene with aryl bromides in the presence of 1 mol% catalyst loading. |
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Keywords: | direct arylation heteroarene N-heterocyclic carbene palladium PEPPSI |
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