Homocoupling of aryl halides (Ullmann-type reaction) promoted by a Pd-poly(N-vinyl-2-pyrrolidone)/MCM-48 (Pd–PVP/MCM-48) nanocomposite catalyst is described. In situ polymerization method was employed to prepare composite poly(N-vinyl-2-pyrrolidone)/MCM-48 (PVP/MCM-48) which was used as a support for palladium nanoparticles obtained by reducing Pd(OAc)2 with hydrazine hydrate. FT-IR, XPS, XRD, UV–Vis, SEM, and BET techniques were used to study the chemical and physical properties of the catalyst. The catalytic performance of this heterogeneous catalyst was specified for Ullmann-type reaction between aryl halies in DMF. The catalyst was good with regard to its stability and it can be reused up to six times without significant loss of its activity.
描述了一种由Pd-poly(N-vinyl-2-pyrrolidone)/MC
M-48 (Pd–PVP/MC
M-48) 纳米复合催化剂促进的芳基卤化物的同聚合反应(Ullmann类型反应)。采用原位聚合的方法制备了复合材料聚(N-vinyl-2-pyrrolidone)/MC
M-48 (PVP/MC
M-48),并用作通过
水合
肼还原Pd(OAc)2获得的
钯纳米颗粒的载体。采用FT-IR、XPS、XRD、UV-Vis、
SEM和BET等技术研究了催化剂的
化学和物理特性。该异相催化剂在
DMF中对芳基卤化物的Ullmann类型反应的催化性能得到了明确。该催化剂在稳定性方面表现良好,可重复使用六次而无显著活性损失。