Heterogeneous Pd-Catalyzed Efficient Synthesis of Imidazolones via Dehydrogenative Condensation between Ureas and 1,2-Diols
作者:Juan Camilo Arango-Daza、Carles Lluna-Galán、Luis Izquierdo-Aranda、Jose R. Cabrero-Antonino、Rosa Adam
DOI:10.1021/acscatal.2c01423
日期:2022.6.17
composed of different acidic or basic inorganic supports were synthesized and extensively compared in this reaction. These studies revealed that the presence of Pd nanoparticles with a wide range of sizes (average particle size 2.8 nm) over a metal oxide support with a high density of acid sites is a key point for the good activity of the material, γ-Al2O3 being the optimum support. Furthermore, a Pd–Zn
开发了一种多相催化的方案,用于N,N '-二取代脲和 1,2-二醇之间的无受体脱氢缩合以提供咪唑啉酮。钯纳米聚集体稳定在具有合适酸性的氧化铝基体上,即[Pd/Al 2 O 3 ],被设计并成功地用作该相关转化的高效且可重复使用的多相纳米催化剂。所开发的方法通过合成超过 25 种具有中等至良好产率的咪唑酮类化合物显示出其广泛的适用性,达到高达 19444 的周转数 (TON) 和初始周转频率 (TOF 0 ) > 290 h –1. 对活性纳米结构催化剂进行了充分表征 [X 射线衍射 (XRD)、高分辨率透射电子显微镜 (HR-TEM)、高分辨率扫描透射电子显微镜 (HR-STEM)、能量色散 X 射线 (EDX) , 拉曼光谱, 程序升温还原 (TPR), 程序升温脱附 (TPD)-NH 3 , TPD-CO 2、X 射线光电子能谱 (XPS)、Brunauer-Emmett-Teller