Cobalt nanoparticles immobilized
on magnetic chitosan (Fe
3
O
4
@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 K
4
[Fe(CN)
6
]·3H
2
O 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.
Background: Design, identification, and synthesis of new antimicrobial agents along with preventive proceedings are essential to confront antibiotic-resistant pathogenic bacteria. Heterocyclic Schiff bases are biologically important compounds whose antimicrobial potentials have been proven to bacterial and fungal pathogens. Objectives: In this study, some quinoline Schiff bases were synthesized from condensation of 2-chloro3-quinolinecarboxaldehyde and aniline derivatives. Their inhibitory activities were evaluated against 6 gram-positive and 2 gram-negative bacterial pathogens. Methods: Disc diffusion, broth microdilution, and time-kill tests were applied according to the CLSI guidelines to determine IZD, MIC, and MBC values. Results: 2-Chloro-3-quinolinecarboxaldehyde Schiff bases could inhibit the growth of bacteria with IZDs of 7.5-19.8 mm, MICs of 256-2048 μg mL-1, and MBCs of 512 to ≥2048 μg mL-1. Conclusion: Moderate antibacterial effects were observed with heterocyclic Schiff bases. Complexation and structural changes can improve their antimicrobial properties.
A direct imination reaction was developed by tandem reaction of alcohols and nitro compounds in the presence of Cu-isatin Schiff base-γ-Fe2O3 as a nanomagnetically recyclable catalyst.
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