Current location: JICS Archive > Vol. 4 > No. 3 > Articles : 4

Effect of Two Isomeric Tetrapyrazolyl Ligands on the Catalytic Oxidation of 3,5-di-tert-Butylcatechol

I. Bouabdallah^a,*, R. Touzani^a,b, I. Zidane^a and A. Ramdani^a

^aLaboratory of Physical Organic Chemistry, Department of Chemistry, Faculty of Sciences, University Mohammed the First, B.P. 524, 60000 Oujda, Morocco
^bUniversity Mohammed the First, Faculty Pluridisciplinary of Nador, B.P.300, 62700 Selouane, Nador, Morocco

Copper(II) salts were combined with a tetrapyrazolyl ligand ({N,N,N’,N’-tetrakis-[(3,5-dimethylpyrazol-1-yl)methyl)-1,4-phenylenediamine}L1 or {N,N,N’,N’-tetrakis-[(1,5-dimethylpyrazol-3-yl)methyl)-1,4-phenylenediamine}L2) and assessed as oxidation catalysts. The corresponding dioxygen complexes were generated in situ by mixing the copper salt and the pyrazolyl donor ligand in air. The oxidation of 3,5-di-tert-butylcatechol (DTBC), which affords 3,5-di-tert-butylquinone (DTBQ), was studied. The reaction rate was found to depend essentially on the nature of the junction linking two pyrazolyl neighbours.

Keywords: Bis-pyrazolyl ligands, Oxidation, 3,5-Di-tert-Butylcatechol, Copper(II)