Synthesis and characterization of sulfamic acid supported on Fe<sub>3</sub>
O<sub>4</sub>
nanoparticles: A green, versatile and magnetically separable acidic catalyst for oxidation reactions and Knoevenagel condensation
Sulfamic acid immobilized on diethylenetriamine functionalized Fe3O4 nanoparticles (SA‐DETA‐Fe3O4) was successfully prepared and characterized by X‐ray diffraction (XRD), Fourier transform infrared spectroscopy (FT‐IR), vibrating sample magnetometer (VSM), thermo gravimetric analysis (TGA), X‐Ray diffraction (XRD) and scanning electron microscopy (SEM). The sulfamic acid was found as a magnetically
成功制备了固定在二亚乙基三胺官能化的Fe 3 O 4纳米颗粒(SA-DETA-Fe 3 O 4)上的氨基磺酸,并通过X射线衍射(XRD),傅立叶变换红外光谱(FT-IR),振动样品磁力计(VSM)对其进行了表征。 ),热重分析(TGA),X射线衍射(XRD)和扫描电子显微镜(SEM)。发现氨基磺酸是用于氧化偶联的硫醇,硫化物的氧化的可磁分离和高活性的催化剂。此外,SA-DETA-Fe 3 O 4在芳族醛与活性亚甲基化合物(丙二腈和氰基乙酸乙酯)的Knoevenagel缩合反应中具有较高的催化活性。可以通过简单的磁分离容易地回收纳米固体催化剂,并在不降低催化活性的情况下重复使用许多循环。
First report of the application of simple molecular complexes as organo-catalysts for Knoevenagel condensation
作者:Sumit Kumar Panja、Nidhi Dwivedi、Satyen Saha
DOI:10.1039/c5ra09036a
日期:——
Knoevenagel condensation is used to synthesize a series of important cyano group containing synthetic precursors for synthesis of biologically active molecules at RT using a minimum amount of catalyst (∼5 mol%) without the need for chromatographic separation techniques. Detailed mechanistic studies and substituenteffects of aromaticaldehydes on the reaction have been investigated. In addition, biologically
Low-Valent Titanium Induced Reductive Coupling of Nitriles with Nitro Compounds
作者:Longhu Zhou、Yongmin Zhang
DOI:10.1080/00397919808004430
日期:1998.9
Abstract The intermolecular and intramolecular reductivecoupling of a cyano group with a nitro group induced by a low-valenttitanium reagent prepared from TiCl4/Sm was studied. Amidines and 2-aminoquinolines derivatives are preparied in good yields under mild conditions respectively.
A series of new highly substituted isoquinoline derivatives was obtained from the reaction of 2‐(1‐substituted piperidin‐4‐ylidene)malononitrile, benzaldehyde and malononitrile or cyanoacetate in ionicliquid at 50°C. This novel procedure was different from the previous method in the synthesis of isoquinoline using pyridine fragment as reactant to construct benzene ring, and as well as had the advantages
Facile and Efficient Synthesis of 2-Aminoquinoline-3-carboxylic Acid Derivatives via Reductive Cyclization of Nitro and Cyano Groups Induced by Low-valent Titanium
作者:Longhu Zhou、Sujiang Tu、Daqin Shi、Guiyuan Dai
DOI:10.1039/a800588e
日期:——
A short and facile synthesis of a series of 2-aminoquinoline-3-carboxylic acid derivatives was accomplished in good yields via the intramolecular reductive cyclization of nitrocyano olefins promoted by TiCl4/Zn.