Publication Type Journal Article
Title Copper(II) complexes with an arylhydrazone of methyl 2-cyanoacetate as effective catalysts in the microwave-assisted oxidation of cyclohexane
Authors Raja Jlassi A.P.C. Ribeiro Elisabete C.B.A. Alegria Houcine Naili Goncalo A. O. Tiago Tobias Rueffer Heinrich Lang Fedor I. Zubkov Armando J.L. Pombeiro Walid Rekik
Groups CCC
Journal INORGANICA CHIMICA ACTA
Year 2018
Month February
Volume 471
Number
Pages 658-663
Abstract Reaction of sodium (E/Z)-2-(2-(1-cyano-2-methoxy-2-oxoethylidene) hydrazinyl) benzene-sulfonate (NaHL) with copper(II) nitrate hydrate in the presence of imidazole (im) in methanol affords [CuL(im)(H2O)] (1). Complex 1 is characterized by IR spectroscopy and ESI-MS spectrometry, elemental and single crystal X-ray crystal structural analyses. The coordination environment of the central copper(II) is nearly intermediate between ideal square-based pyramidal and trigonal bipyramidal geometry, three sites being occupied by the L2- ligand, which chelates in the O, N, O fashion, while two other sites are filled with the water and imidazole molecules. Extensive intermolecular hydrogen bonds between the L2-, water and imidazole ligands lead to a 3D supramolecular network. 1 and known Cu(II) complexes [Cu(H2O)(2)L]center dot H2O (2), [Cu(H2O)(py)L]center dot H2O (3) and [Cu-3(mu(3)-OH)(NO3)(CH3OH)(mu(2)-X)(3)(mu(2)-HL)] (4) act as effective catalysts in the oxidation of cyclohexane to cyclohexanol and cyclohexanone, using low power microwave (MW) irradiation, under mild conditions. Without a promoter, the activity of the catalyst reached a turnover number of 1.44 x 10(3) and a turnover frequency of 1.98 x 10(3) h(-1), after 2 h, at 50 degrees C. (C) 2017 Elsevier B.V. All rights reserved.
DOI http://dx.doi.org/10.1016/j.ica.2017.12.001
ISBN
Publisher
Book Title
ISSN 0020-1693
EISSN 1873-3255
Conference Name
Bibtex ID ISI:000419826000083
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