analyses proved the core–shell structure and the presence of sulfonyl on the surface. The Fe3O4@fibroin-SO3H showed significant activity in the tetrazole derivatives synthesis reactions under solvent-free and relatively mild conditions. The structure of the products was validated using 1H-NMR and 13C-NMR. The prepared catalyst showed good stability and reusability even after easy separation by an external
在本研究中,通过将作为天然聚合物的丝素蛋白与Fe 3 O 4纳米粒子结合在一起,制备了一种具有简便制备技术的磁性可分离强效固体酸纳米催化剂。实际上,Fe 3 O 4纳米颗粒被纤维蛋白蛋白完全覆盖,然后用氯硫酸处理以进行表面磺化。接下来,使用FT-IR,XRD,TGA,SEM,EDX和TEM技术表征理化性质,以阐明Fe 3 O 4纤维蛋白素SO 3 H的结构。分析证明了核-壳结构以及表面上存在磺酰基。铁3 O 4丝素蛋白SO 3 H在无溶剂和相对温和的条件下在四唑衍生物合成反应中显示出显着的活性。使用1 H-NMR和13 C-NMR验证产物的结构。所制备的催化剂即使在通过外部磁体容易地分离连续四轮反应后仍显示出良好的稳定性和可重复使用性。考虑到硫酸催化的至关重要性,我们认为Fe 3 O 4 @丝素蛋白SO 3 H将作为可分离,绿色且有效的固体酸纳米催化剂得到广泛的应用。
Supramolecular Cu(<scp>ii</scp>) nanoparticles supported on a functionalized chitosan containing urea and thiourea bridges as a recoverable nanocatalyst for efficient synthesis of 1<i>H</i>-tetrazoles
作者:Shirin Bondarian、Mohammad G. Dekamin、Ehsan Valiey、M. Reza Naimi-Jamal
DOI:10.1039/d3ra01989f
日期:——
obtained supramolecular CS–TDI–PMDA–TS–Cu(II) nanomaterial was demonstrated to act as a multifunctional nanocatalyst for promoting of multicomponent cascade Knoevenagel condensation/click 1,3-dipolar azide–nitrilecycloaddition reactions very efficiently between aromatic aldehydes, sodium azide and malononitrile under solvent-free conditions and affording the corresponding (E)-2-(1H-tetrazole-5-yl)-3-arylacrylenenitrile
设计了一种经济有效且方便的方法,使用氨基硫脲(TS)、均苯四甲酸二酐(PMDA)和甲苯-2,4-二异氰酸酯(TDI)连接剂将Cu(II)纳米粒子负载在含有脲和硫脲桥的改性壳聚糖主链上。采用傅里叶变换红外(FT- IR)光谱、场发射扫描电子显微镜(FESEM)、热重/差热重分析(TGA / DTA)、能量色散 X 射线光谱 (EDS)、EDS 元素图和 X 射线衍射 (XRD)。所获得的超分子CS-TDI-PMDA-TS-Cu( II )纳米材料被证明可作为多功能纳米催化剂,用于促进芳香醛、钠之间的多组分级联Knoevenagel缩合/点击1,3-偶极叠氮-腈环加成反应。叠氮化物和丙二腈在无溶剂条件下反应,得到相应的( E )-2-(1H-四唑-5-基)-3-芳基丙烯腈衍生物。催化剂负载量低,在无溶剂条件下工作,反应时间短,易于制备和回收,并且催化剂可连续五个循环重复使用而催化效率没有明显下
Facile synthesis of multifunctional magnetic porous organic polymers with high catalytic performance and dye adsorption capacity
作者:Ahmad Nouri Parouch、Nadiya Koukabi
DOI:10.1039/d3nj04941h
日期:2024.2.19
Multifunctional magnetic porous organic polymers (MOPs) rich in sulfide and free phenolic hydroxyl groups were synthesized. The MOPs exhibit a large surface area and can interact strongly with metal ions and cationic dyes, including methylene blue.
Indium-, Magnesium-, and Zinc-Mediated Debenzylation of Protected 1H-Tetrazoles: A Comparative Study
Dedicated to Professor Vicente Gotor on the occasion of his retirement Abstract 5-Substituted 1-benzyltetrazoles are easily debenzylated to give the corresponding deprotected tetrazoles using dissolved metals under protic conditions: Mg/MeOH, In/MeOH, or Zn/MeCO2H are the procedures of choice for this transformation. 5-Substituted 1-benzyltetrazoles are easily debenzylated to give the corresponding