New application of decaniobate salt as basic solid in the synthesis of 4H-pyrans by microwave assisted multicomponent reactions

被引：0
|
作者：
Luisa F. Gutierrez
Eliana Nope
Hugo A. Rojas
Jairo A. Cubillos
Ángel G. Sathicq
Gustavo P. Romanelli
José J. Martínez
机构：
[1] Universidad Pedagógica y Tecnológica de Colombia UPTC,Escuela de Ciencias Químicas, Facultad de Ciencias
[2] UNLP-CCT-CONICET,Departamento de Química, Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. J.J. Ronco” (CINDECA), Facultad de Ciencias Exactas
来源：
Research on Chemical Intermediates | 2018年 / 44卷
关键词：
Decaniobate ions; 4; -pyrans; Microwave; Multicomponent reactions;
D O I：
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中图分类号：
学科分类号：
摘要：
This study focuses on the search of new applications of polyoxometalates known as decaniobate ions [Nb10O28]6−. The decaniobates can be used as basic solid catalysts in multicomponent reactions to obtain good yields to 4H-pyrans (> 95%) under microwave radiation and solvent-free conditions, using several aldehydes with different electron-withdrawing or electron donor substituents. The synthesis of (TMA)6 [Nb10O28]6H2O was performed following a simple protocol (HPNb), which was modified to decrease the number of hexaniobate species that are formed as impurities (HPNb-HF).
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页码：5559 / 5568
页数：9
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