Functional group protections are the key to the synthesis of targeted molecules. In particular, the acetylation reaction is considered as one of the important organic transformations for the preparation of useful products, such as polymers, food additives, cosmetics, medicines and perfumes. Unfortunately, most these methods employed for the acetylation process encompassed the use of acids, bases and hazardous reagents. In this manuscript, a simple and green synthesis of silver nanoparticles (AgNPs) is described using water extract of onion peel as reductant. The synthesized AgNPs were then employed as green catalyst in the acetylation of alcohols and amines. In the transmission electron microscopy analysis, the AgNPs were successfully prepared with an average size of 12.5 nm and was found to be in spherical size without any agglomeration being observed. Moreover, the synthesized AgNPs showed remarkable catalytic activity by mediating the synthesis of various acetates and amides in good to excellent yields (72–95% yields). In addition, the synthesized AgNPs are recyclable and can be utilized up to five times for the subsequent reactions, without significant lost in catalytic efficiency (93–95%). The current method offers many benefits such as environmental benign and green chemical process compared to previous works.

中文翻译：

---

洋葱皮水提取液绿色合成纳米银及其在乙酰化反应中的应用

官能团保护是合成目标分子的关键。特别地，乙酰化反应被认为是用于制备有用产物如聚合物，食品添加剂，化妆品，药​​物和香料的重要有机转化之一。不幸的是，用于乙酰化过程的大多数这些方法包括使用酸，碱和危险试剂。在此手稿中，描述了使用洋葱皮的水提取物作为还原剂的银纳米颗粒（AgNPs）的简单绿色合成。然后将合成的AgNP用作醇和胺的乙酰化中的绿色催化剂。在透射电子显微镜分析中，成功制备了平均大小为12的AgNP。5nm，发现为球形，未观察到任何团聚。此外，合成的AgNP通过介导各种乙酸酯和酰胺的合成，以良好的至极好的收率（72-95％的收率）表现出显着的催化活性。此外，合成的AgNPs可回收利用，最多可用于后续反应五次，而催化效率却没有显着降低（93-95％）。与以前的工作相比，当前的方法具有许多好处，例如环境友好和绿色化学过程。不会明显降低催化效率（93–95％）。与以前的工作相比，当前的方法具有许多好处，例如环境友好和绿色化学过程。不会明显降低催化效率（93–95％）。与以前的工作相比，当前的方法具有许多好处，例如环境友好和绿色化学过程。