负载在 CoFe2O4 MNPs 上的 La (III) 的制备:一种用于硫化物选择性氧化和对称二硫化物合成的新型高效非均相催化剂
摘要:
摘要 本文报道了通过色氨酸 (Trp) 对 CoFe 2 O 4 进行后功能化修饰,制备负载在 CoFe 2 O 4 纳米颗粒上的 La ,可用作高效的可回收纳米催化剂。CoFe 2 O 4纳米粒子表面上的层(Trp)提供了用于负载La(III)的大表面积。所制备的 CoFe 2 O 4/Trp/La 纳米催化剂组件对硫化物的选择性氧化和对称二硫化物的合成具有高催化活性和化学选择性。此外,该纳米催化剂在催化过程中表现出良好的可回收性,可轻松有效地从反应体系中分离出来,并且可以重复使用多个时期,而催化活性和选择性没有显着降低。 图形概要
Synthesis and characterization of oxo-vanadium complex anchored onto SBA-15 as a green, novel and reusable nanocatalyst for the oxidation of sulfides and oxidative coupling of thiols
Abstract The present work describes the synthesis of a new oxo-vanadium complex immobilized on SBA-15 nanostructure as an efficient catalyst for oxidation of sulfides and oxidative coupling of thiols. Characterization of the resultant AMPD@SBA-15 nanostructure was performed by various physico-chemical techniques such as Fourier transform infrared spectroscopy, transmission and scanning electron microscopies
Highly Efficient Oxidative Coupling of Thiols and Oxidation of Sulfides in the Presence of MCM-41@Tryptophan-Cd and MCM-41@Tryptophan-Hg as Novel and Recoverable Nanocatalysts
stable nanocatalysts for Oxidation of sulfides to sulfoxides and oxidative coupling of thiols into their corresponding disulfides. These functionalized complexes were characterized by FT-IR spectroscopy, thermogravimetric analysis (TGA), powder X-ray diffraction (XRD) and N2 adsorption–desorption isotherms. The designed catalysts successfully oxidized a variety of sulfides and thiols with short reaction
摘要 通过将 Cd 或 Hg 配合物固定在 MCM-41 上合成了两种多相催化剂 MCM-41@Tryptophan-Cd 和 MCM-41@Tryptophan-Hg 作为新型、高效、可回收且稳定的纳米催化剂,用于硫化物氧化为亚砜和氧化反应。硫醇偶联成相应的二硫化物。这些功能化配合物通过 FT-IR 光谱、热重分析 (TGA)、粉末 X 射线衍射 (XRD) 和 N2 吸附-解吸等温线进行表征。所设计的催化剂在室温下以短反应时间以高产率成功氧化各种硫化物和硫醇,并在不显着损失其催化活性的情况下回收数次。图形摘要已提出在温和反应条件下合成固定在介孔 MCM-41 表面的 Cd 和 Hg 色氨酸复合物。在对这些催化剂进行表征后,研究了它们用于合成亚砜和二硫化物衍生物的催化活性。
[EN] CLEAVABLE MULTI-ALCOHOL-BASED MICROCAPSULES<br/>[FR] MICROCAPSULES CLIVABLES À BASE D'ALCOOLS MULTIPLES
申请人:FIRMENICH & CIE
公开号:WO2021023645A1
公开(公告)日:2021-02-11
The present invention relates to a new process for the preparation of microcapsules based on cleavable multi-alcohols. Cleavable multi-alcohol-based microcapsules are also an object of the invention. Perfuming compositions and consumer products comprising said capsules, in particular perfumed consumer products in the form of home care or personal care products, are also part of the invention.
Anchoring Ni (II) on Fe<sub>3</sub>
O<sub>4</sub>
@tryptophan: A recyclable, green and extremely efficient magnetic nanocatalyst for one-pot synthesis of 5-substituted 1<i>H</i>
-tetrazoles and chemoselective oxidation of sulfides and thiols
prepared nanocatalyst was applied for the oxidation of sulfides, oxidative coupling of thiols and synthesis of 5‐substituted 1H‐tetrazoles. The use of non‐toxic, green and inexpensive materials, easy separation of magnetic nanoparticles from a reaction mixture using a magnetic field, efficient and one‐pot synthesis, and high yields of products are the most important advantages of this nanocatalyst.
通过将镍作为过渡金属固定在色氨酸包覆的Fe 3 O 4纳米颗粒上,成功地合成了绿色,新颖且极其高效的纳米催化剂。使用傅立叶变换红外光谱,透射电子显微镜,扫描电子显微镜,能量色散X射线光谱,热重分析,电感耦合等离子体发射光谱,振动样品磁力分析和X射线衍射对这种纳米结构材料进行了表征。制备的纳米催化剂可用于硫化物的氧化,硫醇的氧化偶联和5取代1 H的合成-四唑。这种无毒,绿色和廉价的材料的使用,使用磁场易于从反应混合物中分离磁性纳米颗粒,高效且一锅法合成以及高收率的产品是这种纳米催化剂的最重要优势。
Immobilization of a nickel complex onto functionalized Fe3O4 nanoparticles: a green and recyclable catalyst for synthesis of 5-substituted 1H-tetrazoles and oxidation reactions
gravimetric analysis and vibrating sample magnetometer measurements. The catalytic behavior of the prepared nanohybrid as an efficient catalyst was successfully probed in the oxidation of sulfides, oxidative coupling of thiols and synthesis of 5-substituted1H-tetrazoles. This method was found to have significant advantages, including high yield, green reaction conditions, short reaction time, easy separation