ATRP catalysts of tetradentate guanidine ligands – do guanidine donors induce a faster atom transfer?

Abstract

Tripodal tetradentate N donor ligands stabilise the most active ATRP catalyst systems. Here, we set out to synthesise the new guanidine ligand TMG-4NMe2uns-penp, inspired by p-substituted tris(2-pyridylmethyl)amine (TPMA) ligands. The...

Oxidation mechanism of phenols by copper(ii)–halide complexes

“…Phenols are often used as a mechanistic probe for hydrogen atom transfer reactions. To examine the geometric effect on the reactivity of copper( ii )–halide complexes, we also employed copper( ii )–halide complexes 2 X (X = Cl − or Br − ) supported by a tripodal tetradentate ligand TMG 3 tren (1,1,1-tris(2-( N 2 -(1,1,3,3-tetramethylguanidino))ethyl)amine), 15–17 that enforces the trigonal bipyramidal (Tbp) geometry of the metal centre (Fig. 1).…”