Catalytic Performance of Ammonium Salt of Molybdenum Heteropoly Acid Supported Silica for Oxidative Desulfurization of Benzothiophene, Dibenzothiophene and 4,6-Dimethyldibenzothiophene in Model Oil
Synthesis and characterization of PMoV/Fe 3 O 4 /g-C 3 N 4 from melamine: An industrial green nanocatalyst for deep oxidative desulfurization
作者:Ezzat Rafiee、Maryam Khodayari
DOI:10.1016/s1872-2067(16)62548-2
日期:2017.3
that of real oil were also studied under optimized conditions. In addition, the effects of various nitrogen compounds, as well as the use of one- and two-ring aromatic hydrocarbons as co-solvents, on the catalytic removal of sulfur from DBT were investigated. The catalyst was easily separated and could be recovered from the reaction mixture by using an external magnetic field. Additionally, the remaining
Polyoxometalate-Bridged Cu(I)- and Ag(I)-Thiacalix[4]arene Dimers for Heterogeneous Catalytic Oxidative Desulfurization and Azide–Alkyne “Click” Reaction
ne dimers, namely, [Cu4(SiW12O40)(L)2(DMF)2]·2EtOH·DMF (1-Cu) and [Ag4(PMo12O40)(L)2]·OH (1-Ag), were prepared by using a new thiacalix[4]arene, metal cation and polyoxometalate (L = tetra[2-(ethylthio)-1-methyl-1H-imidazole]-thiacalix[4]arene). In 1-Cu and 1-Ag, two thiacalix[4]arenes were linked together by one [SiW12O40]4– or [PMo12O40]3– anion via two metal cations to give a molecular dimer. Further
两种重要的多金属氧酸盐桥连的Cu(I)和Ag(I)-硫杂杯[4]芳烃二聚体,即[Cu 4(SiW 12 O 40)(L)2(DMF)2 ]·2EtOH·DMF(1-铜和[Ag 4(PMo 12 O 40)(L)2 ]·OH(1-Ag),是使用新的噻唑杯[4]芳烃,金属阳离子和多金属氧酸盐(L =四[2-(乙硫基) )-1-甲基-1 H-咪唑]-噻杯[4]芳烃)。在1-Cu和1-Ag中,两个硫杂杯[4]芳烃通过一个[SiW 12 O 40 ] 4–连接在一起。或[PMo 12 O 40 ] 3–阴离子通过两个金属阳离子生成分子二聚体。此外,相邻的二聚体通过氢键延伸成高维超分子结构。值得注意的是,这些分子二聚体在有机溶剂中极其稳定,然后被用作催化氧化脱硫以及叠氮化物-炔烃“点击”反应的有效催化剂。
The Polyoxovanadate-Based Carboxylate Derivative K<sub>6</sub>H[V<sup>V</sup><sub>17</sub>V<sup>IV</sup><sub>12</sub>(OH)<sub>4</sub>O<sub>60</sub>(OOC(CH<sub>2</sub>)<sub>4</sub>COO)<sub>8</sub>]·<i>n</i>H<sub>2</sub>O: Synthesis, Crystal Structure, and Catalysis for Oxidation of Sulfides
The high-nuclearity polyoxovanadate-based carboxylate derivative K6H[VV17VIV12(OH)4O60(OOC(CH2)4COO)8]·nH2O (1) has been successfully synthesized by conventional aqueous methods and structurally characterized. The [VV17VIV12(OH)4O60(OOC(CH2)4COO)8]7– polyanion is built up from three cages: one VV17(OH)4O44} cage and two identical [(VIV3O6)2(OOC(CH2)4COO)4]8– cages. Of the three cages, the VV17(OH)4O44}
高核聚氧钒酸盐基羧酸酯衍生物K 6 H [V V 17 V IV 12(OH)4 O 60(OOC(CH 2)4 COO)8 ]· n H 2 O(1)已通过常规方法成功合成水性方法和结构特征。[V V 17 V IV 12(OH)4 O 60(OOC(CH 2)4 COO)8 ] 7–聚阴离子由三个笼构建:一个VV 17(OH)4 O 44 }笼子和两个相同的[(V IV 3 O 6)2(OOC(CH 2)4 COO)4 ] 8 –笼子。在这三个笼子中,V V 17(OH)4 O 44 }是纯无机聚氧钒酸盐簇,而每个[(V IV 3 O 6)2(OOC(CH 2)4 COO)4 ] 8–笼是基于钒的有机-无机杂化簇,通过四个同时连接两个三角形V 3 }单元的己二酸酯配体构架而成。两个[(V IV 3 O 6)2(OOC(CH 2)4 COO)4 ] 8–笼通过V–O–V键共价连接至中心V
Rate and Selectivity Control in Thioether and Alkene Oxidation with H
<sub>2</sub>
O
<sub>2</sub>
over Phosphonate‐Modified Niobium(V)–Silica Catalysts
作者:Nicholas E. Thornburg、Justin M. Notestein
DOI:10.1002/cctc.201700526
日期:2017.10.10
Supported metal oxidecatalysts are versatile materials for liquid‐phase oxidations, including alkene epoxidation and thioether sulfoxidation with H2O2. Periodic trends in H2O2 activation was recently demonstrated for alkene epoxidation, highlighting Nb‐SiO2 as a more active and selectivecatalyst than Ti‐SiO2. Three representative catalysts are studied consisting of NbV, TiIV, and ZrIV on silica,
负载型金属氧化物催化剂是用于液相氧化的多功能材料,包括烯烃环氧化和H 2 O 2硫醚硫氧化。最近,烯烃环氧化显示出H 2 O 2活化的周期性趋势,突显了Nb-SiO 2比Ti-SiO 2具有更高的活性和选择性。研究了三种代表性的催化剂,它们由二氧化硅上的Nb V,Ti IV和Zr IV组成,每种催化剂都是通过分子前体方法制备的,该方法可产生高度分散的氧化物位点,用于H 2 O 2氧化硫代苯甲醚。。对于环氧化,初始速率趋于Nb> Ti≫Zr,在许多其他硫醚中,Nb的性能优于Ti。相反,在所有转化率下,对亚砜对砜的选择性都会使Ti> Nb≫Zr趋向于增长。用苯膦酸改性Nb-SiO 2催化剂并不能完全消除磺氧化反应性,就像它对光氧化和环氧化一样,并导致不寻常的材料对磺化氧化具有活性,但既不环氧化也不对砜过度氧化。
Transition‐Metal‐Free Cross‐Coupling of Benzothiophenes and Styrenes in a Stereoselective Synthesis of Substituted (
<i>E,Z</i>
)‐1,3‐Dienes
作者:Mindaugas Šiaučiulis、Nanna Ahlsten、Alexander P. Pulis、David J. Procter
DOI:10.1002/anie.201902903
日期:2019.6.24
transition metal‐free one‐pot stereoselective approach to substituted (E,Z)‐1,3‐dienes was developed by using an interrupted Pummerer reaction/ligand‐coupling strategy. Readily available benzothiophene S‐oxides, which can be conveniently prepared by oxidation of the parent benzothiophenes, undergo Pummerer coupling with styrenes. Reaction of the resultant sulfonium salts with alkyllithium/magnesium reagents