Amine triphenolate complexes: synthesis, structure and catalytic activity

Abstract

Triphenolamines are highly modular tetradentate molecules that effectively coordinate to transition metals and main group elements with podand topology. They form chiral complexes with intrinsically well defined coordination geometries controlled by the ligand, in particular by the nature of the substituents in ortho position to the phenol, which are able to influence their reactivity and stability. The metal complexes, especially Ti(iv) and V(v), have been found to be effective catalyst in polymerization reactions and oxygen transfer processes.

Sustainable metal-based catalysts for the synthesis of cyclic carbonates containing five-membered rings

“…Aluminium(III)-aminotris(phenolate) complexes have been studied as Lewis acid catalysts. 58 In light of their previous work with Fe(III)-aminotris(phenloate) complexes, 59 61 He et al described their results for the synthesis of ethylene carbonate 3h catalysed by Al(salen)Cl 26a with tetrabutylammonium bromide as co-catalyst. 62 The homogeneous catalytic formation of ethylene carbonate 4h from a mixture of supercritical carbon dioxide and 3h proceeded rapidly at 110 °C and 150 bar pressure, with a substrate to catalyst to co-catalyst ratio of 5000:1:1.…”

Extending substrate sensing capabilities of zinc tris(2‐pyridylmethyl)amine‐based stereodynamic probe

“…1 Actually, in a wider perspective, smart chiral receptor systems also find applications in anion recognition, 2 electroanalysis, 3 and modern technologies like spin filters to improve the efficiency of LED/OLED. [8][9][10][11] Tris(2-pyridylmethyl) amine (TPMA) ligands, a specific class of tripodal ligands, provide intrinsically stable complexes with well-defined coordination geometries. Among these, polydentate and, more specifically, tripodal ligands proved to be particularly efficient, since they are modular and give robust complexes with high thermodynamic stability.…”

An Efficient Iron Catalyst for the Synthesis of Five‐ and Six‐Membered Organic Carbonates under Mild Conditions

“…[20] These ligands have been combined with titanium, zirconium, and hafnium amongst other metals, to yield catalysts capable of lactide polymerization. [21][22][23] Oxidation catalysis has also been achieved with titanium, vanadium and molybdenum complexes of these ligands.…”