New Nanomagnetic Heterogeneous Cobalt Catalyst for
the Synthesis of Aryl Nitriles and Biaryls
Posted on 2020-07-22 - 15:44
Cobalt nanoparticles immobilized
on magnetic chitosan (Fe3O4@CS-Co) have been
prepared. They were identified using
various techniques such as Fourier-transform infrared spectroscopy,
X-ray diffraction, field emission scanning electron microscopy, energy-dispersive
X-ray spectroscopy, transmission electron microscopy, thermogravimetric
analysis, vibrating sample magnetometry, X-ray photoelectron spectroscopy,
and inductively coupled plasma atomic emission spectroscopy analysis
and applied efficiently as a cobalt catalyst in the cyanation and
fluoride-/palladium-free Hiyama reactions of different types of aryl
halides employing K4[Fe(CN)6]·3H2O and triethoxyphenylsilane, respectively. After each reaction, the
catalyst was isolated and reused for the second run. The catalytic
activity of the catalyst was not lost apparently even after five runs.
No considerable changes in its chemical structure and morphology were
observed. It is worth to note that in this paper, the cobalt catalyst
has been used for the first time for the cyanation of aryl halides.
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Moghadam, Hadis
Hosseini; Sobhani, Sara; Sansano, José Miguel (2020). New Nanomagnetic Heterogeneous Cobalt Catalyst for
the Synthesis of Aryl Nitriles and Biaryls. ACS Publications. Collection. https://doi.org/10.1021/acsomega.0c01002