N-donor 2-(Sulfonamido)benzamide ligands, their palladium(II) coordination species and C–C coupling catalysis efficiencies
作者:Hammed Olawale Oloyede、Helmar Görls、Joseph Anthony Orighomisan Woods、Winfried Plass、Abiodun Omokehinde Eseola
DOI:10.1016/j.molstruc.2019.07.054
日期:2019.12
A series of synthetically accessible ligands based on new 2-(R-sulfonamido)benzamide have been prepared (R = methyl for H3M; R = 4-toly for H3T and T2CN; R = 2,4,6-triisopropylphenyl for H(3)iP and HiPCN). The R-substituents were selected to vary in sizes. Allowing ligand H(3)iP and palladium acetate to stand in solvent leads to self-assembly of the well-defined solvent- and stoichiometry-controlled tetranuclear or hexanuclear coordination macromolecules Pd-4(iP)(2) and (PdHiP)(6), which were analysed by X-ray crystallography. It was observed that palladium active species for Suzuki coupling catalysis could be stabilized by these simple and synthetically assessable N-donor ligands as revealed by turnover frequencies reaching 5500h(-1). Electronic features of these N-donors appear to be more important than the steric properties. (C) 2019 Elsevier B.V. All rights reserved.
ENZYME INHIBITORS
申请人:University of Sunderland
公开号:EP2935234A1
公开(公告)日:2015-10-28
INHIBITORS OF OPLOPHORUS LUCIFERASE-DERIVED BIOLUMINESCENT COMPLEXES
申请人:Promega Corporation
公开号:EP3802514A1
公开(公告)日:2021-04-14
Spectroscopic, X-ray Diffraction and Density Functional Theory Study of Intra- and Intermolecular Hydrogen Bonds in Ortho-(4-tolylsulfonamido)benzamides
作者:Malose J. Mphahlele、Eugene E. Onwu、Marole M. Maluleka
DOI:10.3390/molecules26040926
日期:——
title compounds were determined in solution (NMR and UV-Vis spectroscopy) and in the solidstate (FT-IR and XRD), complemented with density functional theory (DFT) in the gas phase. The nonequivalence of the amide protons of these compounds due to the hindered rotation of the C(O)–NH2 single bond resulted in two distinct resonances of different chemicalshift values in the aromatic region of their 1H-NMR
在溶液中(NMR和UV-Vis光谱法)和在固态(FT-IR和XRD)中测定标题化合物的构象,并在气相中用密度泛函理论(DFT)进行补充。由于C(O)-NH 2单键旋转受阻,这些化合物的酰胺质子不等价,导致它们1的芳族区域中两个不同化学位移的不同共振1 H-NMR谱。在溶液相和固态下观察到羰基氧和磺酰胺氢原子之间的分子内氢键相互作用。XRD证实了这类化合物的酰胺部分具有作为氢键受体形成六元氢键环和供体的能力,同时形成N–H···O =类型的分子间氢键配合物。 S. 硫原子的四面体几何形状变形,导致磺酰胺部分与邻氨基苯甲酰胺支架的共面性发生偏离,并且这种几何形状使氧原子能够形成更高尺寸的氢键。