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
A facile approach for the synthesis of 14-aryl- or alkyl-14H-dibenzo[a,j]xanthenes under solvent-free condition
A facile, efficient and environment-friendly protocol for the synthesis of 14-aryl- or alkyl-14H-dibenzo[a,j]xanthenes has been developed by one-pot condensation of 2-naphthol with aliphatic and aromatic aldehydes in the presence of P2O5 or InCl3 as catalysts undersolvent-free conditions. The present approach offers the advantages of clean reaction, simple methodology, short reaction time, high yield
通过在存在条件下将2-萘酚与脂肪族和芳香族醛进行一锅缩合反应,已开发出一种简便,高效且环境友好的方案,用于合成14-芳基-或烷基-14 H-二苯并[ a,j ]氧杂蒽在无溶剂条件下制备P 2 O 5或InCl 3作为催化剂。本方法具有清洁反应,方法简单,反应时间短,产率高,易于纯化和催化剂经济实用的优点。
The efficient synthesis of 14-alkyl or aryl 14H-dibenzo[a,j]xanthenes catalyzed by bismuth(III) chloride under solvent-free conditions
作者:Ebrahim Soleimani、Mohammad Mehdi Khodaei、Afsaneh Taheri Kal Koshvandi
DOI:10.1016/j.cclet.2011.01.012
日期:2011.8
Abstract An efficient method for the synthesis of 14-alkyl or aryl 14 H -dibenzo[a,j]xanthene derivatives by the reaction of β -naphthol, and aldehydes in the presence of a catalytic amount of bismuth(III) chloride (BiCl 3 ) undersolvent-freeconditions at 110 °C is described. Aliphatic and aromatic aldehydes were used in the reaction and in all cases the desired products were synthesized successfully
Heterogeneous catalyst: Amberlyst-15 catalyzes the synthesis of 14-substituted-14H-dibenzo[a,j]xanthenes under solvent-free conditions
作者:Shengkai Ko、Ching-Fa Yao
DOI:10.1016/j.tetlet.2006.10.072
日期:2006.12
A one-pot condensation of β-naphthol with aldehydes in the presence of Amberlyst-15 to give 14-substituted-14H-dibenzo[a,j]xanthenesundersolvent-free condition is described.
Alkyl- or aryl-14H-dibenzo[a,j]xanthene derivatives are synthesized efficiently by the reaction of beta-naphthol and aliphatic and aromatic aldehydes in the presence of KAl(SO4)2 x 12 H2O (alum) under aqueous condition at 100 degrees C. Different types of aromatic and aliphatic aldehydes are used in the reaction and in all cases the products synthesized successfully. Several solvents were examined
在KAl(SO4)2 x 12 H2O(alum)存在下于100°C的水溶液条件下,通过β-萘酚与脂肪族和芳香族醛的反应,可以有效地合成烷基或芳基14H-二苯并[a,j]氧杂蒽衍生物反应中使用了不同类型的芳族和脂族醛,并且在所有情况下均成功合成了产物。检查了该反应的几种溶剂。然而,就反应产率和时间而言,发现水是最佳溶剂。