Preyssler heteropolyacid supported on silica coated NiFe2O4 nanoparticles for the catalytic synthesis of bis(dihydropyrimidinone)benzene and 3,4-dihydropyrimidin-2(1H)-ones
作者:Hossein Eshghi、Ali Javid、Amir Khojastehnezhad、Farid Moeinpour、Fatemeh F. Bamoharram、Mehdi Bakavoli、Masoud Mirzaei
DOI:10.1016/s1872-2067(14)60265-5
日期:2015.3
Abstract A novel magnetic acidic catalyst comprising Preyssler (H 14 [NaP 5 W 30 O 110 ]) heteropoly acid supported on silica coated nickel ferrite nanoparticles (NiFe 2 O 4 @SiO 2 ) was prepared. The catalyst was characterized by Fourier transform infrared, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive spectrum, VSM and particle size neasurement
摘要 制备了一种新型磁性酸性催化剂,其包含负载在二氧化硅包覆的铁氧体镍纳米颗粒(NiFe 2 O 4 @SiO 2 )上的 Preyssler (H 14 [NaP 5 W 30 O 110 ]) 杂多酸。通过傅里叶变换红外光谱、扫描电镜、透射电镜、X射线衍射、能谱、VSM和粒度测定对催化剂进行了表征。通过Biginelli反应研究了其在合成双(二氢嘧啶酮)苯和3,4-二氢嘧啶-2(1 H)-酮衍生物中的催化活性。使用催化剂,反应在不到 1 小时内发生,产率非常好。更重要的是,催化剂很容易通过外部磁铁从反应混合物中分离出来,并且可以重复使用至少五次而不会降低活性。