چكيده به لاتين
Recently, environmental pollution and the economic crisis have become very important global challenges. Today, industrial and manufacturing units, including manufacturers of chemicals and pharmaceutical companies, are interested in environmentally friendly protocols, so-called green and sustainable chemistry. Green chemistry is a new branch of modern chemistry. The use of nanocatalysts has led to advatages in chemistry. Heterocycles such as flavonol, quinoline and thiochroman are a very important class of organic compounds that are widely used in materials science, agriculture and medicine. Due to the existing synthetic limitations for the preparation of these compounds, research is continuing to find new synthetic methods. In the present study, using the collected data, marine polysaccharide were first purified and then used as heterogeneous biocatalysts for the preparation of heterocyclic flavonol, quinoline and thiochroman compounds. The benefits of this research including the use of recyclable biological nanocatalysts, simplicity of test methods, short reaction time, high product yields, low cost, ease of the process of separation and purification of the products, use of non-toxic and green solvents. In order to identify and charecterize the properties of nanocatalysts, various analytical methods such as subsurface spectroscopy with Fourier transform, X-ray diffraction, scanning electron microscopy, elementary measurement by X-ray energy scattering method, Thermogravimetric analysis, vibrating-sample magnetometer and Other methods have been used. The synthetic heterocyclic products have also been studied by infrared spectroscopy and nuclear magnetic resonance spectroscopy.
