Imidazolium Salts: A Mild Reducing and Antioxidative Reagent
摘要:
The concept of directly using imidazolium salts (IMSs) as mild reducing and antioxidative reagents was proposed and investigated. A simple and robust protocol for the synthesis stable, ultrafine gold nanoparticles has been established using IMSs under mild IMSs showed remarkably lower toxicity but greater antioxidative power than N-acetyl-L-cystein and (-)-epigallocatechin gallate on HSC-T6 cells. These studies demonstrate that the simple and inexpensive IMSs represent a new type of antioxidant with potential biomedical applications.
The Facile Hydrolysis of Imidazolinium Chlorides (N‐Heterocyclic Carbene Precursors) Under Basic Aqueous Conditions
作者:Nedra Touj、Jerwin Jay Taping、Nikolay Tumanov、Johan Wouters、Lionel Delaude
DOI:10.1002/chem.202302402
日期:2023.12
The hydrolysis of imidazolinium chlorides takes place readily in a basic water/dichloromethane biphasic mixture at room temperature. Experimental conditions were optimized to afford full conversions and high yields of γ-aminoformamides starting from symmetrical or unsymmetrical substrates. Structural parameters that affect the resilience of these important NHC precursors in the presence of moisture
Deprotonation of 1,3-diorganyl imidazolinium salts, 1, with N,C-type palladacyclic acetate dimer 2 afforded novel NHC coordinated complexes 3 along with ring opening hydrolysis products 4, which may coordinate to palladium center via NH group to give 5a. The hydrolysis necessitates the study of NHC complex formation in anhydrous media. The new compounds were characterized by spectroscopic methods and three of them (3c, 4c, 5a) by X-ray single-crystal diffraction studies. (C) 2009 Elsevier B. V. All rights reserved.