Catecholase activity investigations using in situ copper complexes with pyrazole and pyridine based ligands

Authors: A. Mouadili, A. Attayibat, S. El Kadiri, S. Radi, R. Touzani

Abstract:
The in situ copper (II) complexes of six pyrazole and pyridine based ligands: 1-[5-methyl-1- pyridin-2-yl-1H-pyrazol-3-yl] methanol L₁, 2-(3,5-dimethyl-pyrazol-1-yl)-pyridine L₂, (5-methyl-3- pyridin-2-yl-1H-pyrazol-1-yl) ethyl acetate L₃, 1 ,5,5 -trimethyl-1'H-1,3'-bipyrazol-3-ethyl carboxylat L₄, (1',5,5'-trimethyl-1'H1,3'-bipyrazol-3-yl) methanol L₅, and 5,5'-diphenyl-3,3'-bipyrazole L₆, are reported and studied for their catecholase activities at ambient conditions, the reaction rate depends on four parameters: The nature of the carbonic chain bounded to the pyrazole ring, the nature of counter anion, the concentration of ligand and the nature of solvent. The highest rate activity is given by complex resulting from one equivalent of ligand L₄ and two equivalents of Cu(CH₃COO)₂ in methanol, which equal to 4.440 mol L⁻¹ min⁻¹.

Keywords:
Pyrazole
Catechol
Pyridylpyrazole
Nitrogen heterocycles
Copper
Oxidation reaction

Published in: Applied catalysis A: General  (Volume 454, Pages 1-172, 15 March 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Catecholase activity investigations using in situ copper complexes with pyrazole and pyridine based ligands

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