Arylhydrazone Cd(II) and Cu(II) complexes as catalysts for secondary alcohol oxidation. (17th June 2017)

• Record Type: Journal Article
• Authors: Jlassi, Raja; Ribeiro, Ana P.C.; Mendes, Marta; Rekik, Walid; Tiago, Gonçalo A.O.; Mahmudov, Kamran T.; Naïli, Houcine; Guedes da Silva, M. Fátima C.; Pombeiro, Armando J.L.
• Is Part Of: Polyhedron. Volume 129(2017)
• Page Start: 182
• Page End: 188
• Publication Date: 2017-06-17
• Subjects: Arylhydrazones of β-diketones -- CdII complexes -- Oxidation of cyclohexanol -- Oxidation of 1-phenylethanol -- Catalysis; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2017.03.020
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Arylhydrazone-Cd(II) and Cu(II) compounds work as catalysts for the oxidation of secondary alcohols under mild conditions. Abstract: Reaction of cadmium acetate hydrate with sodium 2-[2-(4, 4-dimethyl-2, 6-dioxocyclohexylidene)hydrazinyl]terephthalate (Na2 HL), in the presence of imidazole (im), leads to the polymeric species [Cd(im)3 (µ, η-HL-1κOO′:2κO″O‴)] n (1 ) that is characterized by IR spectroscopy, elemental analysis, UV–Vis absorption spectroscopy and X-ray diffraction analysis. Complex1 was successfully tested as catalyst for the peroxidative oxidation of alcohols (1-phenylethanol and cyclohexanol) to the corresponding ketones under microwave irradiation, with no added solvent and under mild conditions. The use of tert -butylhydroperoxide as oxidant, of TEMPO as additive, and a temperature of 80 °C leads in 1 h to a yield of acetophenone (from 1-phenylethanol) of nearly 70% or to a cyclohexanone yield (from cyclohexanol) of 66%. A comparison between the catalytic activity of1 with those (also studied in this work) shown by Cu(II) complexes bearing the same or related hydrazo ligand is presented.