Palladium(II) complexes with 2,4-dichloro-N-[di(alkyl/aryl)carbamothioyl]benzamide derivatives and triphenylphosphine as effective catalysts for oxidation of alcohols in ionic liquid
New four-coordinated distorted square-planar palladium(II) complexes of the type [Pd(PPh3)2(L)]+PF6− (1–4) {where L = 2,4-dichloro-N-[di(alkyl/aryl)carbamothioyl]benzamide derivatives} were prepared from the reactions between [PdCl2(PPh3)2] and 2,4-dichloro-N-(diisobutylcarbamothioyl)benzamide (HL1)...
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Published in | Inorganic chemistry communications Vol. 89; pp. 55 - 59 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
AMSTERDAM
Elsevier B.V
01.03.2018
Elsevier |
Subjects | |
Online Access | Get full text |
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Summary: | New four-coordinated distorted square-planar palladium(II) complexes of the type [Pd(PPh3)2(L)]+PF6− (1–4) {where L = 2,4-dichloro-N-[di(alkyl/aryl)carbamothioyl]benzamide derivatives} were prepared from the reactions between [PdCl2(PPh3)2] and 2,4-dichloro-N-(diisobutylcarbamothioyl)benzamide (HL1) or 2,4-dichloro-N-(diethylcarbamothioyl)benzamide (HL2) or 2,4-dichloro-N-(dibutylcarbamothioyl)benzamide (HL3) or 2,4-dichloro-N-(dibenzylcarbamothioyl)benzamide (HL4) in methanol. These complexes have been characterized by elemental analyses, IR, UV/Vis, 1H, 13C and 31P NMR spectroscopy. Besides, without any additive and base, the complexes 1–4 (0.005 mmol) exhibited good catalytic activity with the combination of hydrogen peroxide (3.0 mmol) and 1-butyl-3-methylimidazolium hexafluorophosphate {[bmim][PF6]} (0.1 mL) for the oxidation of primary and secondary alcohols (0.5 mmol) to their corresponding aldehydes and ketones respectively, at 80 °C.
New four-coordinated distorted square-planar palladium(II) complexes of the type [Pd(PPh3)2(L)]+PF6− were found to be active catalysts in 1-butyl-3-methylimidazolium hexafluorophosphate medium in the presence of H2O2 for the oxidation of various alcohols at 80 °C. Interestingly, the present catalytic system worked for the oxidation of alcohols without any additive and base. [Display omitted]
•Efficient oxidation of alcohols to carbonyl compounds in the presence of H2O2 in 1-butyl-3-methylimidazoliumhexafluorophosphate•Benzylic and allylic alcohols are oxidized efficiently•Square-planar Pd(II) complexes act as effective catalysts for the oxidation of alcohols in ionic liquid. |
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ISSN: | 1387-7003 1879-0259 |
DOI: | 10.1016/j.inoche.2018.01.008 |