Reducing elution method for copper(II) in cation-exchange chromatography by hydroxylamine hydrocloride solution

New Stable Cu(I) Catalyst Supported on Weakly Acidic Polyacrylate Resin for Green C-N Coupling: Synthesis of N-(Pyridin-4-yl)benzene Amines and N,N-Bis(pyridine-4-yl)benzene Amines

“…The selective reduction methods of Cu(II) to Cu(I) may be carried out by action of iodide ion, cyanide ion [ 21 ], or using sodium ascorbate [ 22 ]. Few articles demonstrate the use of hydroxyl amine as a reducing agent for reduction of copper(II) complex [ 23 ], reduction of copper(II) sulfate [ 24 , 25 ] and to reduce Cu(II) ion [ 26 ] to corresponding Cu(I). In this work, we used hydroxyl ammonium chloride successfully to reduce polymer supported Cu(II) ion in ammine complex form to Cu(I).…”