The development of an ecofriendly procedure for alkaline metal (II) sulfate promoted synthesis of<i>N</i>,<i>N</i>â²-dimethyl substituted (unsubstituted)-4-aryl-3,4-dihydropyrimidones (thiones) and corresponding bis-analogues in aqueous medium: Evaluation by green chemistry metrics
作者:Chhanda Mukhopadhyay、Arup Datta
DOI:10.1002/jhet.283
日期:——
Different alkalinemetal (II) sulfates were used as catalysts for the N,N′-dimethylsubstituted as well as unsubstituted 4-aryl-3,4-dihydropyrimidones (thiones) and their correspondingbis-analogues in aqueousmedium. Among the various salts, MgSO4·7H2O (Epsom salt) proved to be the best catalyst giving the desired products in good to excellent yields. This catalyst enables the construction of a series
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。