Polyhedron p. 39 - 45 (2017)
Update date:2022-08-16
Topics:
Gunasekaran
Bhuvanesh
Karvembu
The reactions between [CuCl2(PPh3)2] and 3,3-diphenyl-1-(2,4-dichlorobenzoyl)thiourea (HL1), 3,3-diisobutyl-1-(2,4-dichlorobenzoyl)thiourea (HL2) or 3,3-diethyl-1-(2,4-dichlorobenzoyl)thiourea (HL3) in benzene gave new four-coordinated tetrahedral copper(I) complexes of the type [CuCl(HL)(PPh3)2] (1–3) [HL = 3,3-dialkyl/aryl-1-(2,4-dichlorobenzoyl)thiourea derivatives]. These complexes were then characterized by analytical and spectroscopic (IR, UV/Vis,1H,13C and31P NMR) techniques. The molecular structure of a representative complex, [CuCl(HL1)(PPh3)2] (1), was determined by the single crystal X-ray diffraction method which reveals a distorted tetrahedral geometry around the Cu(I) ion. The complexes 1–3 (0.007 mmol) were found to be active catalysts for the oxidation of primary and secondary alcohols 5.0 mmol to their corresponding acids and ketones, respectively, in the presence of hydrogen peroxide (6.0 mmol) in 1-butyl-3-methylimidazolium hexafluorophosphate {[bmim][PF6]} (0.1 mL) without any additive and base, at 70 °C.
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