Research Laboratory of Green Organic Synthesis and Polymers, Department of Chemistry, Iran University of Science and Technology, Tehran, 16846-13114, Islamic Republic of Iran.
Sci Rep. 2021 Sep 13;11(1):18105. doi: 10.1038/s41598-021-97554-3.
A new nano-scale Cu@salicylaldehyde-modified-chitosan (Cu@Sal-CS) was synthesized through a green, eco-friendly and cost-effective technique. The prepared catalyst was characterized using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDXS), and inductively coupled plasma (ICP) analysis. The synthesized Cu@Sal-CS catalyst indicated its performance in the C-O and C-N oxidative coupling using the reaction of 1,3-dicarbonyl derivatives/2- substituted phenols with amides for the preparation of carbamates, as well as in the reaction of aldehydes and various amines in the synthesis of amides. The significant features of this work are operational simplicity of catalyst synthesis, in situ and new modification method, use of an efficient, recoverable, frequently reused and stable catalyst without any loss of catalytic activity, and high yields of the products in short times.
一种新型的纳米级 Cu@salicylaldehyde-modified-chitosan (Cu@Sal-CS) 通过绿色、环保且经济高效的技术合成。使用傅里叶变换红外光谱 (FT-IR)、扫描电子显微镜 (SEM)、能量色散 X 射线光谱 (EDXS) 和电感耦合等离子体 (ICP) 分析对制备的催化剂进行了表征。合成的 Cu@Sal-CS 催化剂在 1,3-二羰基衍生物/2-取代苯酚与酰胺的 C-O 和 C-N 氧化偶联反应中表现出性能，用于制备氨基甲酸酯，以及在醛和各种胺的反应中表现出性能在酰胺的合成中。这项工作的显著特点是催化剂合成操作简单、原位和新的修饰方法、使用高效、可回收、频繁重复使用且稳定的催化剂，没有任何催化活性损失，并且在短时间内获得高产率的产物。
