Prolinamide functionalized polyacrylonitrile fiber with tunable linker length and surface microenvironment as efficient catalyst for Knoevenagel condensation and related multicomponent tandem reactions
作者:Hai Zhu、Gang Xu、Huimin Du、Chenlu Zhang、Ning Ma、Wenqin Zhang
DOI:10.1016/j.jcat.2019.04.040
日期:2019.6
attaching amines to fiber matrix as well as the constructed hydrophobic microenvironment by linker group within the surface layers of fiber materials effectively promotes the reactions. In addition, the good swollen capacity of fiber in solvent ensure that the reaction proceed well. Fiber catalyst PANPA−2F modified by prolinamide with a C2 alkyl chain exhibited the best catalytic performance and can
首次通过共价键合制备了一系列具有可调的烷基连接基团长度和不同连接基团的脯氨酰胺聚丙烯腈纤维催化剂,并具有良好的机械强度,FT-IR,XRD,EA,TGA,SEM和水接触角特征。在Knoevenagel缩合反应和一锅法Knoevenagel-Michael多组分串联反应中评估了这些纤维催化剂的催化活性,以合成α,β-不饱和腈和2-氨基-4 H-色烯衍生物在水中。结果表明,在纤维材料表面层中合适的连接长度的胺与纤维基质连接,以及通过连接基团构建的疏水性微环境均能有效地促进反应。另外,纤维在溶剂中的良好溶胀能力确保反应进行得很好。脯氨酰胺修饰的具有C2烷基链的纤维催化剂PAN PA-2 F表现出最佳的催化性能,可以轻松回收和再利用至少十个连续循环,而不会显着降低催化活性和浸出活性位。