12-Tungestocobaltic acid, H5CoW12O40, was immobilized on nanosilica from rice husk ash to produce H5CoW12O40@nanosilica as a bifunctional nanocatalyst. The TEM result showed that the particles are mostly spherical in shape, and that they have an average size of approximately 10 nm. The catalytic activity of this catalyst was investigated in Mannich reaction of various aldehydes, ketones, and amines in water. This rapid procedure afforded structurally diverse β-amino ketones in high to excellent yields. Short reaction time, simple work-up procedure, elimination of toxic solvents, and low catalyst loading are the advantages of this procedure.
十二
钨钴酸H5CoW12O40被固定在稻壳灰纳米
硅上,制备出H5CoW12O40@纳米
硅作为一种双功能纳米催化剂。透射电镜结果显示,这些粒子大多呈球形,平均尺寸约为10 nm。该催化剂在各种醛、酮和胺在
水相中的Mannich反应中的催化活性得到了研究。这一快速过程以高至优异的产率提供了结构多样的β-
氨基酮。短反应时间、简单的后处理步骤、消除有毒溶剂和低催化剂用量是这个方法的优点。