Abstract

An efficient, recyclable silica supported tungstophosphoric acid (HPW/SiO₂) catalyst was prepared by simple stirring method. The catalyst was characterized using FT-IR, X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), and scanning electron microscopy (SEM) techniques. The catalyst was explored in semi aqueous condition toward synthesis of 1,8-dioxoacridine carboxylic acid derivatives. It was recycled up to four runs and a very marginal loss was detected. The targeted compounds were synthesized in a very short time period and simple work procedure with excellent yield.

中文翻译：

---

硅载磷钨酸（HPW/SiO2）酸催化剂的制备、表征及在半水条件下合成1, 8-二氧代吖啶羧酸衍生物中的应用

摘要

采用简单搅拌法制备了一种高效、可回收的二氧化硅负载钨磷酸（HPW/SiO _{2 ）催化剂。}使用 FT-IR、X 射线衍射 (XRD)、Brunauer-Emmett-Teller (BET) 和扫描电子显微镜 (SEM) 技术对催化剂进行了表征。该催化剂在半水性条件下用于合成 1,8-二氧吖啶羧酸衍生物。它被回收了四次运行，并且检测到非常小的损失。目标化合物的合成时间极短，操作简单，收率优异。