Synthesis, characterization, reactivity and catalytic activity of a novel chiral manganese Schiff base complex†
Abstract
A new chiral linear tetramine (N1-(1-(2-aminophenylamino)propan-2-yl)benzene-1,2-diamine), CLT, and its Schiff base ligand, which was derived from CLT with 2-hydroxybenzaldehyde, was synthesized and transformed into the corresponding manganese(III) complex. The Schiff base ligand was studied by 1H NMR, 13C NMR, COSY, HSQC, DEPT and microanalysis. Density functional theory (DFT) calculations were performed to determine the structure of the [MnIIIL]+ complex. This manganese complex catalyzes the oxidation of alcohols using 30% H2O2 as an oxidant. Over-oxidation of aldehydes to carboxylic acid and the formation of by-products was not observed. α–β unsaturated alcohol was oxidized smoothly without the oxidation of the double bond.