Lanthanide–EDTA complexes covalently bonded on Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> magnetic nanoparticles promote the green, stereoselective synthesis of <i>N</i>-acylhydrazones
作者:João Batista M. de Resende Filho、Nathália Kellyne S. M. Falcão、Gilvan P. Pires、Luiz Fernando S. de Vasconcelos、Sávio M. Pinheiro、José Maurício dos Santos Filho、Marília Imaculada Frazão Barbosa、Antônio Carlos Doriguetto、Ercules E. S. Teotonio、Juliana A. Vale
DOI:10.1039/c9nj02916h
日期:——
and applicability of green procedures. In this work, lanthanide–EDTA complexes covalently bonded on Fe3O4@SiO2 magnetic nanoparticles (Fe3O4@SiO2-xN-EDTA–Ln3+, with x = 1, 2, or 3 N spacer groups, and Ln3+ = La3+, Ce3+, Sm3+, Eu3+, Gd3+, Tb3+, Er3+ or Yb3+) were prepared and investigated as a heterogeneous catalyst for the synthesis of N-acylhydrazones. The target molecules were obtained in good to excellent
在最近几年中,已经开发出许多使用磁性纳米材料基催化剂的合成方法,这些方法对于绿色工艺的效率,选择性和适用性具有相当大的优势。在这项工作中,镧系元素-EDTA络合物共价键合在Fe 3 O 4 @SiO 2磁性纳米颗粒上(Fe 3 O 4 @SiO 2 - x N-EDTA-Ln 3+,其中x = 1、2或3 N间隔基并且Ln 3+ = La 3+,Ce 3+,Sm 3+,Eu 3+,Gd 3+,Tb 3+,Er制备了3+或Yb 3+)并作为合成N-酰基hydr的非均相催化剂进行了研究。在温和条件下反应时间短,易回收催化剂的浓度低后,仅以E-非对映异构体的形式获得了高至优异收率的目标分子。