title: Oxidant-induced intramolecular triazole formation.
abstract: C3-symmetric ligands carrying a rigid triaminoguanidinium backbone are important building blocks for the preparation of supramolecular coordination cages as tetrahedra or trigonal bipyramides. Coordination of Eu(III)- or Gd(III)-ions leads to 1,2,4-triazole formation, which has been reported only rarely. Using Pd(II)-complexes as a model system, this triazole formation could be analyzed in more detail. The preparation of Pd(II)-coordination compounds can be easily done under stoichiometric control. These complexes could be transformed into 1,2,4-triazoles using O2 or H2O2 as an oxidation reagent. The steric demand of the PR3-coligand seems to play a key role in the cyclisation reaction.
authors: Institute of Inorganic Chemistry, RWTH Aachen, Landoltweg 1, 52074 Aachen, Germany. iris.oppel@ac.rwth-aachen.de.
authors: Maria L
authors: ML
authors: Abraham
authors: A Carina
authors: AC
authors: Schulze
authors: Alexander
authors: A
authors: Korthaus
authors: Iris M
authors: IM
authors: Oppel