H5BW12O40 as a green and efficient homogeneous but recyclable catalyst in the synthesis of 4H-Pyrans via multicomponent reaction 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Applied Organometallic Chemistry
年/卷/期
2018 / 32 / 9
页码
4479-1-4479-10
ISSN号
0268-2605
作者单位
Alzahra Univ, Sch Sci, Dept Chem, POB 1993891176, Tehran, Iran;Ferdowsi Univ Mashhad, Fac Sci, Dept Chem, Mashhad 917751436, Iran;Alzahra Univ, Sch Sci, Dept Chem, POB 1993891176, Tehran, Iran;Alzahra Univ, Sch Sci, Dept Chem, POB 1993891176, Tehran, Iran;Alzahra Univ, Sch Sci, Dept Chem, POB 1993891176, Tehran, Iran;Ferdowsi Univ Mashhad, Fac Sci, Dept Chem, Mashhad 917751436, Iran;
作者
Heravi, Majid M.;Mirzaei, Masoud;Beheshtiha, Seyed Yahya Shirazi;Zadsirjan, Vahideh;Ameli, Fatemeh Mashayekh;Bazargan, Maryam;
摘要
Keggin-type heteropolyacid, H5BW12O40 (BWA) with a higher negative charge and stronger Bronsted acidity comparing to Si and P derivatives was used as an efficient, green, and reusable catalyst in a three-component reaction involving the cyclocondensation of various beta-dicarbonyl compounds, differently substituted aromatic aldehydes and malononitrile in EtOH/H2O for the facile, clean, and high yielding synthesis of 4H-pyrans. All reactions were completed in short times and the products were obtained in good to excellent yields. The reaction medium could be recycled and reused several times without any loss of efficiency.
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关键词/主题词
H3BW12O40;homogeneous catalysis;Keggin-type polyoxometalates;multicomponent reaction;one-pot synthesis;
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