Chelidamic acid functionalized stimuli-responsive hydrogel supported-palladium catalyst for copper-free Sonogashira reaction in aqueous media
作者:Jianhua Yang、Xi Zhang、Wei Yu、Weijie Liu、Fengling Bian
DOI:10.1016/j.reactfunctpolym.2013.02.007
日期:2013.5
acid functionalized PNIPAM-co-PPAP hydrogel exhibited excellent capacity to anchor palladium (II) and the resulting material showed well catalytic activity for copper-free Sonogashira reaction of aryl halides with phenylacetylene in aqueous media. The reactions proceeded well with 0.1 mol% of Pd (II) catalyst, due to the good dispersion of Pd2+ in the macroporous structure as well as the enrichment of
在水和水的混合溶剂中,通过N-异丙基丙烯酰胺(NIPAM)和4-(丙烯酰氧基)吡啶-2、6-二羧酸钾(PAP)的自由基聚合反应,合成了一种热和pH响应水凝胶(PNIPAM-co-PPAP)。四氢呋喃。SEM显微照片显示水凝胶是大孔的,并且基质内的孔相互连接。螯胺酸官能化的PNIPAM-co-PPAP水凝胶具有出色的锚定钯(II)的能力,所得材料对芳基卤化物与苯乙炔在水性介质中的无铜Sonogashira反应表现出良好的催化活性。由于Pd 2+的良好分散性,因此在0.1 mol%的Pd(II)催化剂下反应进行得很好在反应条件下水凝胶中的大孔结构中反应物的富集以及反应物的富集。通过可逆溶胀/溶胀,可以通过简单的方法容易地回收PNIPAM-co-PPAP水凝胶固定的Pd(II)催化剂。此外,PNIPAM-co-PPAP / Pd催化剂显示出良好的可循环性,可以循环使用六次而不会明显降低催化活性。