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Preparation, characterization and catalytic application of molybdenum Schiff‐base complex immobilized on silica‐coated Fe 3 O 4 as a reusable catalyst for the synthesis of pyranopyrazole derivatives
Author(s) -
Hamrahian Seyedeh Aghigh,
Salehzadeh Sadegh,
Rakhtshah Jamshid,
Haji babaei Farshid,
Karami Niloofar
Publication year - 2019
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.4723
Subject(s) - malononitrile , chemistry , catalysis , schiff base , molybdenum , pyrazoline , base (topology) , knoevenagel condensation , heterogeneous catalysis , condensation reaction , organic chemistry , combinatorial chemistry , polymer chemistry , mathematical analysis , mathematics
A recoverable molybdenum Schiff‐base complex immobilized on silica‐coated Fe 3 O 4 nanoparticles was prepared and characterized. This superparamagntic nanocatalyst, which is separable using an external magnet, can be used as an efficient catalyst for the promotion of the synthesis of pyranopyrazole derivatives. A variety of desired products were obtained in high to excellent yields within short times. In comparison with other catalysts employed in the condensation of various aromatic aldehydes, malononitrile and 3‐methyl‐1‐phenyl‐2‐ pyrazoline‐5‐one, the present catalyst showed a much higher activity in terms of mild conditions and short reaction time. The catalyst can be reused for several times without significant loss of activity.