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Efficient and green synthesis of dihydropyrimido[4,5‐ b ]quinolinetriones using MWCNTs@TEPA/Co (II) as a novel and eco‐friendly catalyst
Author(s) -
Saeidiroshan Hakimeh,
Moradi Leila
Publication year - 2020
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.5732
Subject(s) - catalysis , chemistry , thermogravimetric analysis , dimedone , heterogeneous catalysis , inductively coupled plasma , carbon nanotube , aldehyde , aryl , fourier transform infrared spectroscopy , chemical engineering , inductively coupled plasma atomic emission spectroscopy , green chemistry , nuclear chemistry , organic chemistry , reaction mechanism , plasma , physics , alkyl , quantum mechanics , engineering
A new heterogeneous nanocatalyst [MWCNTs@TEPA/Co (II)] was successfully prepared using multiwall carbon nanotubes (MWCNTs) as a suitable and efficient support for covalent anchoring of tetraethylene pentaamine (TEPA)/Co (II). The new heterogeneous catalyst was prepared through an easy and applicable method, and characterized by various techniques such as Fourier transform‐infrared, thermogravimetric analysis, energy‐dispersive X‐ray spectroscopy, mapping, field emission‐scanning electron microscopy, inductively coupled plasma‐optical emission spectrometry and Brunauer−Emmett−Teller. Synthesized catalyst was used efficiently for the preparation of dihydropyrimido [4,5‐ b ]quinolinetrione derivatives via the four‐components reaction of barbituric acid, dimedone, aryl aldehyde and amines under thermal conditions. The nanostructure catalyst was easily recovered by filtration and reused several times without noticeable loss of its catalytic activity. Low amounts of catalyst (0.005 g), short reaction times and green conditions are some merits of the presented method.