Novel ionic liquid [Et3N-SO3H][MeSO3]: Synthesis, characterization and catalytic performance for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes
作者:M. S. Takallo、A. Zare
DOI:10.4314/bcse.v33i1.7
日期:——
14-aryl-14 H -dibenzo[ a , j ]xanthenes. [Et 3 N-SO 3 H][MeSO 3 ] efficiently catalyzed the reaction, and the products were obtained in high to excellent yields and in short reaction times. KEY WORDS : Protic acidicionicliquid, N , N -Diethyl- N -sulfoethanaminium methanesulfonate ([Et 3 N-SO 3 H][MeSO 3 ]), 2-Naphthol, Arylaldehyde, 14-Aryl-14 H -dibenzo[ a , j ]xanthene Bull. Chem. Soc. Ethiop. 2019
Alkene-modified Fe3O4 nanoparticle-mediated construction of functionalized mesoporous poly(ionic liquid)s: Synergistic catalysis of mesoporous confinement effect and hydrogen proton for organic transformations
resulting MPILs show excellent catalytic activity for condensation reaction and Knoevenagel condensation. The kinetic study reveals that the excellent catalytic activity of MPILs is attributed to the synergistic catalysis of mesoporous confinement effect and hydrogen proton from MPILs, albeit with mass transfer resistance produced by mesoporous channels. Further, the catalyst can be recovered using an external
介孔聚(离子液体)(MPIL)的制备对于多相催化剂的设计至关重要,而传统方法很难获得具有明确定义的介孔结构和独特功能的材料。在这里,成功制备了具有明确介孔结构的HClO 4官能化MPIL,其中烯烃改性的Fe 3 O 4纳米颗粒作为结构增强剂在介孔结构形成中起着至关重要的作用。MPIL以N 2为特征吸附/解吸,扫描电子显微镜(SEM),透射电子显微镜(TEM),傅立叶变换红外光谱(FT-IR),X射线衍射(XRD),热重分析(TGA)和振动样品磁强(VSM),结果表明,MPIL具有中等的表面积,明确的介孔率,丰富的活性离子中心以及有效的磁回收率。所得的MPIL对缩合反应和Knoevenagel缩合显示出极好的催化活性。动力学研究表明,尽管具有介孔通道产生的传质阻力,但MPIL的优异催化活性归因于介孔约束作用和MPIL的氢质子的协同催化作用。进一步,可以使用外部磁场回收该催化剂,并重复使用至少
Influence of the post-synthesis method on the number and size of secondary mesoporous structure of NaY zeolite and its effect on catalyst loading. An efficient and eco-friendly catalyst for synthesis of xanthenes under conventional heating
作者:Maryam Moosavifar、Leila Fathyunes
DOI:10.1007/s13738-016-0929-4
日期:2016.11
preparation method of dealuminatedYzeolite on catalyst loading. In this paper, NaY zeolite was dealuminated by chemical operation with ethylenediaminetetraacetic acid (H4EDTA) treatment. In this method, extra-framework aluminum species removed from the supercage of zeolite and therefore increases the Si/Al ratio and pore volume. Consequently, the loading of the molybdophosphoric acid (MPA) in the supercage
已经使用了几种鉴定技术来研究脱铝Y沸石的制备方法对催化剂负载量的影响。在本文中,NaY沸石通过乙二胺四乙酸(H 4EDTA)处理。在这种方法中,从沸石的超笼中除去了骨架外的铝,从而增加了Si / Al的比例和孔体积。因此,与(0.0875 g / g等于0.043 mmol / kg)相比,EDTA处理(MPA-MDAZY)中的沸石超笼中的钼磷酸(MPA)负载增加(0.1 g / g等于0.049 mmol / g载体)。 g支持物)以水热法(MPA-DAZY)。XRF,AAS,FTIR,SEM,BET,XRD和WDX分析也证实了这些结果。减少反应时间和增加EDTA处理对水热法的催化活性可能与基于去除多余骨架铝的高催化剂负载量有关。在黄嘌呤合成反应中已经比较了两种催化剂的催化活性。
Host (nanocavity of dealuminated zeolite-Y)-guest (12-molybdophosphoric acid) nanocomposite material: An efficient and reusable catalyst for synthesis of 14-substituted-14-H-dibenzo[a,j] xanthenes under thermal and microwave irradiation conditions
Résumé 12-Molybdophosphoric acid (MPA) encapsulated in the supercages of dealuminated zeolite Y (DAZY) was used as an efficient and reusable catalyst for green synthesis of biologically active 14-substituted-14-H-dibenzo[a,j] xanthene derivatives via three-component reaction under conventional heating and microwave irradiation conditions. The prepared catalyst, MPA-DAZY, was characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and elemental analysis techniques. The catalyst, MPA-DAZY, was reused several times without significant loss of its catalytic activity.
Ruthenium anchored on multi-walled carbon nanotubes: an efficient and reusable catalyst for the synthesis of xanthenes
作者:Khalil Tabatabaeian、Mohammad Ali Zanjanchi、Manouchehr Mamaghani、Ali Dadashi
DOI:10.1007/s11164-015-2344-3
日期:2016.5
coupled plasma and elemental analysis. This heterogeneous catalyst was successfully applied in the multi-component synthesis of various xanthene derivatives in good to excellent yields (28 samples, up to 96 % yield) under reflux condition and ultrasonicirradiation. The prepared catalyst was recovered four times without appreciable loss of activity.