چكيده به لاتين
In a past few years, more focus has been given to Nanoparticles and nanoscience become interesting science among chemistry, material, physics, medicinal, biology, mechanic and other sciences due to its novel, extensive and unique applications in various fields. Their reactivity, toughness and other properties are also dependent on their unique size, shape and structure. Nanoparticle chemistry is a young branch of chemical research. For more than a century, transition metal nanoparticles were widely used as heterogeneous catalysts and Today, nanoscience appears to be essential and important in organic chemistry, nanocatalysts were used in various reactions and multi component reactions, nanocatalysts play an important role in enhancing the yield of products. propounding a ecofriendly methods for the synthesis of nanoparticles important branch of nanotechnology, and it is a great challenge that find a reasonable way to gain those nanocomposites. Graphene oxide(GO) contains a range of reactive oxygen functional groups. Tetraketones and Xanthenediones have been generally synthesized via condensation of aromatic aldehydes with Diketones under different conditions and using various catalysts. However, some of these methodologies have some disadvantages such as low yields, prolonged reaction time, harsh reaction conditions, high temperature and the requirement of excess of catalysts or special apparatus, hazard organic solvents, and tedious workup. Therefore, development of new and environmentally friendly methodologies and introducing green catalysts to overcome these disadvantages is still desirable. In continuation of our interest to develop mild and efficient catalysts for different MCRs, and introduced graphene oxide/ZnO nanocomposite (GO/ZnO), as an efficient, and recoverable catalyst, for the synthesis of different tetraketones with water as a green solvent and Xanthenediones under solvent-free conditions to address green chemistry principles
