Title : ( Investigation of the uncommon basic properties of [Ln(W5O18)2]9– (Ln = La, Ce, Nd, Gd, Tb) by changing central lanthanoids in the syntheses of pyrazolopyranopyrimidines )
Authors: Nahid Lotfian , Majid M. Heravi , Masoud Mirzaei Shahrabi , Mansoureh Daraie ,
Full TextAbstract
Five Lindqvist-type lanthanopolyoxometalates ([Ln(W5O18)2] 9–, Ln = La, Ce, Nd, Gd, Tb) complexes were prepared and fully characterized. Their basic catalytic activity was manipulated in the successful and high yielding synthesis of a series of pyrazolopyranopyrimidines via a four-component reaction, involving ethyl acetoacetate, hydrazine hydrate, benzaldehydes, and barbituric acid under ultrasonic irradiation. The catalytic activity of these catalysts with different Ln were compared under the same optimized reaction conditions in term of yields of obtained products, in shorter reaction time, indicating the superiority of the of the catalytic activity of ([Tb(W5O18)2]9– in the aforementioned Multicomponent reaction (MCR).
Keywords
Lanthanopolyoxometalates; Lindqvist; Ultrasonic irradiations; Pyrazolopyranopyrimidines; Multicomponent reaction; Catalysis.
@article{paperid:1075499,
author = {ناهید لطفیان and مجید م. هروی and Mirzaei Shahrabi, Masoud and منصوره دارایی},
title = {Investigation of the uncommon basic properties of [Ln(W5O18)2]9– (Ln = La, Ce, Nd, Gd, Tb) by changing central lanthanoids in the syntheses of pyrazolopyranopyrimidines},
journal = {Journal of Molecular Structure},
year = {2020},
volume = {1199},
month = {January},
issn = {0022-2860},
pages = {126953--126958},
numpages = {5},
keywords = {Lanthanopolyoxometalates; Lindqvist; Ultrasonic irradiations; Pyrazolopyranopyrimidines; Multicomponent reaction; Catalysis.},
}
%0 Journal Article
%T Investigation of the uncommon basic properties of [Ln(W5O18)2]9– (Ln = La, Ce, Nd, Gd, Tb) by changing central lanthanoids in the syntheses of pyrazolopyranopyrimidines
%A ناهید لطفیان
%A مجید م. هروی
%A Mirzaei Shahrabi, Masoud
%A منصوره دارایی
%J Journal of Molecular Structure
%@ 0022-2860
%D 2020
