NNN pincer palladium(II) complexes with N-(2-(1H-pyrazol-1-yl)phenyl)-picolinamide ligands: synthesis, characterization, and application to heck coupling reaction
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引用次数: 0
Abstract
N-(2-(1H-pyrazol-1-yl)phenyl)-picolinamide ligands 3a–c and 5a–f have been easily prepared from commercially available 2-pyridinecarboxylic acid. Reaction of 3a–c and 5a–f with PdCl2 in toluene in the presence of triethylamine gave the nine NNN pincer Pd(II) complexes 6a–i in 15–91% yields. All the new compounds were characterized by 1H, 13C NMR spectra and HRMS. In addition, the molecular structures of complexes 6a and 6i have also been determined by single-crystal X-ray diffraction. The obtained palladium(II) catalysts showed efficient catalytic activity toward the Heck coupling of aryl bromides with styrenes. Under the condition of 5% catalyst loading, the expected various styrenes were obtained in moderate to high yields (up to 99% yield).
期刊介绍：
Transition Metal Chemistry is an international journal designed to deal with all aspects of the subject embodied in the title: the preparation of transition metal-based molecular compounds of all kinds (including complexes of the Group 12 elements), their structural, physical, kinetic, catalytic and biological properties, their use in chemical synthesis as well as their application in the widest context, their role in naturally occurring systems etc.
Manuscripts submitted to the journal should be of broad appeal to the readership and for this reason, papers which are confined to more specialised studies such as the measurement of solution phase equilibria or thermal decomposition studies, or papers which include extensive material on f-block elements, or papers dealing with non-molecular materials, will not normally be considered for publication. Work describing new ligands or coordination geometries must provide sufficient evidence for the confident assignment of structural formulae; this will usually take the form of one or more X-ray crystal structures.
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