in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...

dendrimer synthesis strategies now provide virtual control of macromolecular nanostructures as a function of size and surface/interior functionality. these strategies involve the covalent assembly of hierarchical components reactive monomers , branch cells or dendron’s around atomic or molecular cores according to divergent/convergent dendrite branching principles.combinon of two or more dendri...

Due to the increasing population growth, the lack of uncontrolled land in cities, the pattern of housing production in cities has gradually changed and has expanded into residential complexes to respond to housing demand, which has The social interaction of residents has been diminishing. The public space of a high-rise residential complex, if designed appropriately for residents' gatherings, c...

Introduction: Place attachment is the intersection of physical elements, activities, and mental concepts concerning place, formed from the environmental characteristics and individuals' mental patterns and evaluation. Based on the available resources, it seems that improving the functional efficiency of residential open spaces can help to improve the level of people's attachment. Methodology: T...