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Green and rapid synthesis of dihydropyrimido [4,5‐ b ]quinolinetrione derivatives using CoFe 2 O 4 @PPA as high efficient solid acidic catalyst under ultrasonic irradiation
Author(s) -
Moradi Leila,
Mahdipour Pegah
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.4996
Subject(s) - catalysis , tetraethyl orthosilicate , yield (engineering) , chemistry , solid acid , nuclear chemistry , precipitation , fourier transform infrared spectroscopy , chemical engineering , reaction conditions , heterogeneous catalysis , nano , environmentally friendly , nanotechnology , organic chemistry , materials science , metallurgy , physics , engineering , ecology , meteorology , biology
A new high efficient and green protocol for the preparation of dihydropyrimido[4,5‐ b ]quinolinetrione derivatives using magnetically solid acid catalyst was presented. High performance solid acid catalyst was prepared through a three‐step reaction. Firstly, CoFe 2 O 4 nano particles were synthesized using co‐precipitation method. In second step, CoFe 2 O 4 nano particles were coated with SiO 2 shell through treatment with tetraethyl orthosilicate (CoFe 2 O 4 @SiO 2 ). Finaly, CoFe 2 O 4 @SiO 2 was modified with polyphosphoric acid (CoFe 2 O 4 @SiO 2 /PPA) in a simple manner. Green reusable catalyst was characterized in details using FTIR, VSM, TEM, FESEM, EDX and used as catalyst for the synthesis of dihydropyrimido[4,5‐ b ]quinolinetrione derivatives. Reaction was performed under ultrasonic irradiation as green, effective and mild conditions and products were achieved in high to excellent yields. Green and eco‐friendly conditions, short reaction times with high yield of products in addition to easy workup are some merits of presented method.