Publication Type Journal Article
Title Cu-II complexes bearing the 2,2,2-tris(1-pyrazolyl)ethanol or 2,2,2-tris(1-pyrazolyl)ethyl methanesulfonate scorpionates. X-Ray structural characterization and application in the mild catalytic peroxidative oxidation of cyclohexane
Authors Telma F. S. Silva Gopal S. Mishra M. Fátima C. Guedes da Silva Riccardo Wanke L.M.D.R.S. Martins Armando J.L. Pombeiro
Groups CCC
Journal DALTON TRANSACTIONS
Year 2009
Month
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Volume
Number 42
Pages 9207-9215
Abstract Reactions between CuCl2 and the functionalized scorpionate 2,2,2-tris(1-pyrazolyl)ethanol HOCH2C(pz)(3) 1 (pz = pyrazolyl) or 2,2,2-tris(1-pyrazolyl)ethyl methanesulfonate CH3SO2OCH2C(pz)(3) 2 yield the corresponding water soluble Cu-II complexes [CuCl2\HOCH2C(pz)(3)\](3) or [CuCl2\CH3SO2OCH2C(pz)(3)\](2) 4. In 3 the scorpionate ligand shows the typical N,N,N-coordination mode, whereas in the dinuclear complex 4 it binds the metal as a bidentate species. Compounds 1-4 have been characterized by IR, far-IR, elemental analysis and (for 2-4) single crystal X-ray diffraction. The new scorpionate complexes 3 and 4 are shown to act as catalyst precursors for the peroxidative oxidation of cyclohexane to cyclohexanol (main product) and cyclohexanone, under mild conditions (at room temperature and using an aqueous solution of H2O2) reaching TON values up to 186 in NCMe/H2O. Their hydrosolubility allows them to operate also in pure aqueous media (without any organic solvent, although less effectively), a rare feature of significance towards a green alkane oxidation process.
DOI http://dx.doi.org/10.1039/b911990f
ISBN
Publisher ROYAL SOC CHEMISTRY
Book Title
ISSN 1477-9226
EISSN 1477-9234
Conference Name
Bibtex ID ISI:000270973800019
Observations
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