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H 5 BW 12 O 40 as a green and efficient homogeneous but recyclable catalyst in the synthesis of 4 H ‐Pyrans via multicomponent reaction
Author(s) -
Heravi Majid M.,
Mirzaei Masoud,
Beheshtiha Seyed Yahya Shirazi,
Zadsirjan Vahideh,
Mashayekh Ameli Fatemeh,
Bazargan Maryam
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4479
Subject(s) - malononitrile , chemistry , catalysis , homogeneous , reaction conditions , heterogeneous catalysis , homogeneous catalysis , organic chemistry , medicinal chemistry , thermodynamics , physics
Keggin‐type heteropolyacid, H 5 BW 12 O 40 (BWA) with a higher negative charge and stronger Brønsted 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 β‐dicarbonyl compounds, differently substituted aromatic aldehydes and malononitrile in EtOH/H 2 O for the facile, clean, and high yielding synthesis of 4 H ‐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.