The Relative Reactivities of the Isomeric Methyl Pyridinecarboxylates in the Acylation of Certain Ketones. The Synthesis of β-Diketones Containing Pyridine Rings
Pd(II) Complexes with Pyridine Ligands: Substituent Effects on the NMR Data, Crystal Structures, and Catalytic Activity
作者:Gracjan Kurpik、Anna Walczak、Mateusz Gołdyn、Jack Harrowfield、Artur R. Stefankiewicz
DOI:10.1021/acs.inorgchem.2c01996
日期:2022.9.5
A wide range of functionalized pyridineligands have been employed to synthesize a variety of Pd(II) complexes of the general formulas [PdL4](NO3)2 and [PdL2Y2], where L = 4-X-py and Y = Cl– or NO3–. Their structures have been unambiguously established via analytical and spectroscopic methods in solution (NMR spectroscopy and mass spectrometry) as well as in the solid state (X-ray diffraction). This
广泛的功能化吡啶配体已被用于合成各种通式 [Pd L 4 ](NO 3 ) 2和 [Pd L 2 Y 2 ] 的 Pd(II) 配合物,其中L = 4-X- py 和 Y = Cl –或 NO 3 –. 它们的结构已通过溶液中的分析和光谱方法(核磁共振光谱和质谱)以及固态(X 射线衍射)明确确定。这种深入的表征表明,具有吸电子或供电子性质的基团(EWG 和 EDG)的配体分子的官能化导致所需配位化合物的物理化学性质发生显着变化。1 H NMR 光谱中信号的低场位移在复合族内部和之间的配位时观察到,清楚地表明 NMR 化学位移和配体碱度之间的关系,由 p K a估计价值观。详细的晶体学研究揭示了各种弱相互作用的作用,这可能是解释配合物溶液化学方面的因素。已发现 Pd(II) 配合物在结构不同的底物范围内是 Suzuki-Miyaura 和 Heck 交叉偶联反应中有效且通用的预催化剂,并且已确定有助于提高这两个过程效率的因素。
The Relative Reactivities of the Isomeric Methyl Pyridinecarboxylates in the Acylation of Certain Ketones. The Synthesis of β-Diketones Containing Pyridine Rings
作者:Robert Levine、James K. Sneed
DOI:10.1021/ja01156a035
日期:1951.12
Substituent regulated photoluminescent thermochromism in a rare type of octahedral Cu<sub>4</sub>I<sub>4</sub> clusters