Browsing by Author "Hasan YAKAN"
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TRDizin Preparation, Characterization, and Antioxidant Features of Some New Schiff Bases Derived from Isatins and Hydrazine(2020-12-01) Hasan YAKAN; Halit MUĞLUNew isatins based on Schiff bases were prepared from hydrazine, 5-substituted isatins, and aldehydes under reflux in ethanol. The structures of the synthesized compounds were elucidated by using IR, 13C NMR, 1H NMR spectroscopy and elemental analysis. All the compounds were tested in vitro antioxidant activity with free radical scavenging method using by 1,1-diphenyl-2-picryl hydrazyl (DPPH). The results were given with calculated IC50 values.TRDizin Synthesis, spectroscopic studies, and antioxidant activities of novel thio/carbohydrazones and bis-isatin derivatives from terephthalaldehyde(2020-02-01) Hasan YAKAN; Temel Kan BAKIR; Halit MUĞLUNew bis(isatins-thio/carbohydrazones) based on Schiff bases were prepared from terephthalaldehyde biscarbohydrazone and 5-substituted isatins in the presence of a drop of sulfuric acid under reflux in ethanol. Terephthalaldehyde bis(thio/carbohydrazone) was synthesized by the reaction of (thio)/carbohydrazide and terephthalaldehyde inthe presence of a few drops of acetic acid under reflux in ethanol. The structures of these synthesized compounds weredetermined using IR, 1 H NMR, and 13 C NMR spectroscopy and elemental analysis. The in vitro antioxidant activityof all the compounds was determined by the 1,1-diphenyl-2-picryl hydrazyl (DPPH.) free radical scavenging method.Compound 2 showed the best antioxidant activity.