“…At first, diethylenetriamine pro-ligands 1a – 8a were synthesized by a reported method . New aluminum complexes 5 – 8 were synthesized with 58–74% yields by reacting a solution of diethylenetriamine pro-ligands 5a – 8a with a commercially available 2 M solution of AlMe 3 in toluene (Scheme ).…”