Abstract
The research work presented in this thesis is a consolidated report of experiments aimed at controlling the product selectivity in photochemical reactions. Water soluble hosts such as p-sulfonato calix[n]arenes (n= 6 or 8) and cyclodextrins have been used to solubilize organic molecules in water and to control the product selectivity. These host molecules control the product selectivity by their ability to encapsulate and interact with guest molecules. Furthermore, carrying out reactions in water as solvent is important from green chemistry point of view.