Synthesis of<i>ortho</i>-Hydroxybenzophenones Catalyzed by Magnetically Retrievable Fe<sub>3</sub>O<sub>4</sub>Nanoparticles under Ligand-Free Conditions
作者:Thekkathu Ramani、Paspulati Umadevi、K. Leon Prasanth、Bojja Sreedhar
DOI:10.1002/ejoc.201300909
日期:2013.9
ortho-Benzoylation of phenols with aryl aldehydes to afford the substituted 2-hydroxybenzophenones can be catalyzed efficiently by Fe3O4 nanoparticles under ligand-free conditions. This method is useful for the preparation of xanthones in good yields. The catalyst can be magnetically removed and recycled easily over four cycles without a significant decrease in activity.
在无配体条件下,Fe3O4 纳米颗粒可以有效地催化苯酚与芳醛的邻苯甲酰化反应,得到取代的 2-羟基二苯甲酮。该方法可用于以良好的产率制备氧杂蒽酮。催化剂可以磁性去除并在四个循环中轻松回收,而不会显着降低活性。