Organic synthesis via magnetic attraction: benign and sustainable protocols using magnetic nanoferrites
作者:R. B. Nasir Baig、Rajender S. Varma
DOI:10.1039/c2gc36455g
日期:——
Magnetic nano-catalysts have been prepared using simple modification of iron ferrites. The nm size range of these particles facilitates the catalysis process, as an increased surface area is available for the reaction; the easy separation of the catalysts by an external magnet and their recovery and reuse are additional beneficial attributes. Glutathione bearing nano-ferrites have been used as organocatalysts for the Paal–Knorr reaction and homocoupling of boronic acids. Nanoferrites, post-synthetically modified by ligands, were used to immobilize nanometals (Cu, Pd, Ru, etc.) which enabled the development of efficient, sustainable and green procedures for azide–alkynes-cycloaddition (AAC) reactions, C–S coupling, O-allylation of phenol, Heck-type reactions and hydration of nitriles.
通过简单修饰铁氧体,已制备出磁性纳米催化剂。这些粒子处于纳米尺寸范围,有助于催化过程,因为反应可利用增加的表面积;外部磁铁易于分离催化剂,并可回收和重复使用,这些是额外的有益特性。负载谷胱甘肽的纳米铁氧体已用作有机催化剂,用于Paal-Knorr反应和硼酸的均偶联。通过配体后合成改性的纳米铁氧体,用于固定纳米金属(铜、钯、钌等),从而实现了高效、可持续和绿色的叠氮-炔烃环加成(AAC)反应、碳-硫偶联、酚的烯丙基化、 Heck型反应和腈的水合反应的方法发展。