Polyvinyl alcohol-stabilized cuprous oxide particles: efficient and recyclable heterogeneous catalyst for azide–alkyne cycloaddition in water at room temperature
作者:Abdol Reza Hajipour、Fatemeh Mohammadsaleh
DOI:10.1007/s13738-015-0599-7
日期:2015.8
complex formation with OH groups, subsequently this PVA–Cu(II) macromolecular complex as a precursor reacted with ascorbic acid as a reducing agent at pH = 12 to obtain the PVA–Cu2O composite. The products were characterized using XRD, FE-SEM, FTIR, and UV–Visible techniques. The as-prepared PVA–Cu2O composite was applied as an effective and recyclable heterogeneous catalyst for 1,3-dipolar cycloaddition
PVA稳定的Cu 2 O颗粒是在室温下在有氧条件下,在水性介质中使用新颖简单的路线制备的。最初,Cu(II)离子通过与OH基团形成络合物而固定在PVA基质中,随后这种PVA-Cu(II)大分子络合物作为前体与抗坏血酸作为还原剂在pH = 12的条件下反应以获得PVA-Cu 2 O复合材料。使用XRD,FE-SEM,FTIR和UV-Visible技术对产品进行表征。制备的PVA–Cu 2将O复合材料用作末端炔烃与叠氮化物之间的1,3-偶极环加成反应的有效且可回收的多相催化剂,以在环境友好的反应条件下制备1,2,3-三唑。使用催化量的这种复合物作为高效,稳定,耐空气和湿气的催化剂,在室温下于水中的优异收率,可以由各种芳基和苄基叠氮化物制成取代的三唑。这些PVA稳定化的Cu 2 O颗粒可以以容易的方式从反应混合物中回收并重复使用几次而没有任何催化活性的损失。