Journal
MOLECULAR CATALYSIS
Volume 439, Issue -, Pages 224-232Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mcat.2017.07.006
Keywords
Cu(II) complexes; Aroylhydrazone; X-ray structure; Oxidation of toluene; Microwave-assisted oxidation
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Funding
- Fundacao para a Ciencia e a Tecnologia: FCT, Portugal [UID/QUI/00100/2013, PTDC/QEQ-ERQ/1648/2014, PTDC/QEQ-QIN/3967/2014]
- FCT, Portugal [SFRH/BPD/86067/2012]
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Cu(II) complexes in two different tautomeric forms (keto and enol) derived from the aroylhydrazone Schiff base 2-hydroxy(2-hydroxybenzylidene)benzohydrazide (H2L) have been synthesized and characterized by elemental analysis, IR spectroscopy, ESI-MS and single crystal X-ray crystallography. While the compound with the enol form of the ligand exists as the 1D polymer [Cu(kappa KNOO',2 kappa O',3 kappa O-L)](n) (1), that with the keto form of the ligand occurs as the monomer [Cu(KNOO'-HL)CI(CH3OH)] (2). Both complexes act as good catalysts for the microwave-assisted peroxidative oxidation of toluene and 1-phenylethanol with tert-butyl hydroperoxide. Complex 2 exhibits the highest activity in both reactions, leading selectively to,a maximum product yield of 39 and 92%, respectively. (C) 2017 Elsevier B.V. All rights reserved.
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