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Selectivity: A goal for synthetic economy

Chemical reactivity plays a major role in understanding several aspects of selectivity. Therefore, we present a plethora of reactions that demonstrate our efforts in exploiting interesting cases of selectivity observed in the past three decades. Among them, chemoselectivity, regioselectivity and steroselectivity are discussed. Strain, steric factors, and separations of the reacting functionalities are displayed as prominent features in generating selectivity.