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Regioselectiviy occurs in chemical reactions where one reaction site is preferred over another. For example, the addition of an asymmetric reagent (such as H-Cl) to an asymmetric alkene may yield two different products. The reaction is regioselective if one of the two products is preferred over the other. Markovnikov additions are common examples of regioselective reactions.
This material is based upon work supported by the National Science Foundation under Grant Number 1246120