method, vibrating sample magnetometery and thermo-gravimetric analysis. These nanoparticles were identified as an efficient catalyst for one-pot three-component synthesis of 4,8-dihydropyrano[3,2-b]pyran derivatives in excellent yields. The catalyst was easily separated by magnetic decantation, and the recovered nanoparticles were reused for four fresh runs without any significant loss of catalytic activity
我们已经描述了一种新的方法,以heterogenize小号通过容易制备的
离子液体为基础的催化剂嗪小号嗪固定
二氧化硅涂布的Fe 3 ö 4的磁性纳米颗粒的[Fe 3 ö 4 @SiO 2 -小号-triazinium
氯化物]。通过傅立叶变换红外光谱,X射线粉末衍射,扫描电子显微镜,透射电子显微镜,能量色散X射线方法,振动样品磁强法和热重分析对新制备的纳米颗粒的结构进行了表征。这些纳米颗粒被确定为一锅三组分合成4,8-二氢
吡喃[3,2- b]的有效催化剂] pyran衍
生物,产率极高。容易通过磁倾析分离催化剂,并且将回收的纳米颗粒重新用于四个新的运行,而催化活性没有任何显着损失。评价了合成的二氢
吡喃并[3,2- b ]
吡喃的抗氧化和抗真菌活性,发现它们相对活性。