Stabilisation of 2,6‐Diarylpyridinium Cation by Through‐Space Polar–π Interactions
作者:Joan Simó Padial、René de Gelder、Célia Fonseca Guerra、F. Matthias Bickelhaupt、Jasmin Mecinović
DOI:10.1002/chem.201304462
日期:2014.5.19
The through‐space polar–π interactions between pyridiniumion and the adjacent aromatic rings in 2,6‐diarylpyridines affect the pKa values. Hammett analysis illustrates that the basicity of pyridines correlates well with the sigma values of the substituents at the para position of the flanking aryl rings.
吡啶鎓离子与2,6-二芳基吡啶中的相邻芳环之间的全空间极性-π相互作用会影响p K a 值。Hammett分析表明,吡啶的碱性与 芳基侧翼对位的取代基的sigma值具有很好的相关性。
Delineating the Role of Substituents on the Coordination Behavior of Aroylhydrazone Ligands in Pd
<sup>II</sup>
Complexes and their Influence on Suzuki–Miyaura Coupling in Aqueous Media
piperonal aroylhydrazone ligands (HL1–HL4) with [PdCl2(PPh3)2] in CH3OH and CHCl3 afforded four new Pd(II) complexes (1–4) featuring diverse coordination behaviors. These complexes 1–4 were fully characterized by elemental analyses, UV/Visible, FT‐IR and 1H/13C NMR spectra. The variant coordination modes of piperonal aroylhydrazone ligands with Pd(II) ion in these complexes were unambiguously confirmed