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首页> 外文期刊>Catalysis science & technology >Peroxoniobium(V)-catalyzed selective oxidation of sulfides with hydrogen peroxide in water: a sustainable approach
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Peroxoniobium(V)-catalyzed selective oxidation of sulfides with hydrogen peroxide in water: a sustainable approach

机译:在水中用过氧化氢的硫化物催化氧化的过氧山(V)的选择性氧化:一种可持续方法

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摘要

An efficient and eco-compatible route for the selective oxidation of a variety of thioethers to the corresponding sulfoxide or sulfone with 30% aqueous H2O2 in water, using newly synthesized peroxoniobium (pNb) complexes as catalysts, is described. The catalysts with formulas Na-2[Nb(O-2)(3)(arg)]center dot 2H(2)O (arg = arginate) (NbA) and Na-2[Nb(O-2)(3)(nic)(H2O)]center dot H2O (nic = nicotinate) (NbN) have been synthesized from the reaction of sodium tetraperoxoniobate with 30% H2O2 and the respective organic ligand in an aqueous medium, and these have been comprehensively characterized by elemental analysis, spectral studies (FTIR, Raman, H-1 NMR, C-13 NMR and UV-vis), EDX analysis and TGA-DTG analysis. The density functional theory (DFT) method has been used to investigate the structure of the synthesized pNb complexes. The catalysts are physiologically safe and can be reused for at least six reaction cycles without losing their activity or selectivity. The oxidation is chemoselective for sulfides or sulfoxides leaving the C=C or alcoholic moiety unaffected. The developed methodologies, apart from being high yielding and straightforward, are completely free from halogen, organic co-solvent, or co-catalysts.
机译:描述了一种有效且具有生态兼容的途径,用于选择将各种硫乙烷氧化为相应的硫氧化硫化物或磺基,并使用新合成的过氧酮(PNB)配合物作为催化剂,在水中使用30%水中的H2O2水溶液中的硫酮或磺基。带有公式Na-2 [Nb(O-2)(3)(arg)]中心点2H(2)O(arg =精氨酸)(NBA)(NBA)(NBA)和Na-2 [NB(O-2)(3)的催化剂。 (NIC)(H2O)]中心点H2O(NIC = Nicotinate)(NBN)已从四氧二氧化钠与30%H2O2的反应中合成,并在水性介质中进行了各个有机配体,这些有机配体通过元素分析进行​​了全面表征,光谱研究(FTIR,Raman,H-1 NMR,C-13 NMR和UV-VIS),EDX分析和TGA-DTG分析。密度功能理论(DFT)方法已用于研究合成的PNB复合物的结构。催化剂在生理上是安全的,可以至少六个反应周期重复使用,而不会失去其活性或选择性。氧化是硫化物或硫氧化物的化学选择性,使C = C或酒精部分未受影响。除了高屈服和直率外,开发的方法完全没有卤素,有机共溶剂或共催化剂。

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