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</center><p>And the E2 reaction can be a good example of a stereospecific reaction. On the left, we have our substrate, and we have these two phenyl groups here • A stereoselective reaction is one in which a single reactant can give two or more stereoisomeric products, and one or more of these products is preferred over the others – even if the preference is very small. Addition of non-symmetrical reagent (i.e. Regiochemistry is the study of different pathways that A. Definitions of Regiospecific and Regioselective Reactions; B. Regioselectivity in Radical Reactions of Carbohydrates In a stereospecific reaction, the stereochemistry of the substrate determines the stereochemistry of the product. An enantioselective reaction is selective for the formation of one enantiomer over another A stereoselective reaction is selective for the formation of one stereoisomer over another. We will talk about this particular reaction in more detail later A regioselective reaction is selective for the formation of one constitutional isomer (“regioisomer”) over another. Finally, it is also worthy to note that the steric effect might get an important role in some particular  Understanding the molecular mechanism in a regiospecific [3+2] cycloaddition reaction including C-O interaction: A MEDT study Reactions of vinyl azides and β‐haloalkyl azides with active methylene compounds. Synthesis of 1‐vinyl‐1,2,3‐triazoles. Journal of Heterocyclic Chemistry,(2), In regioselective reactions, if only one product is formed exclusively, then the reaction is called regiospecific reaction. Ifchloropropane were the only product then the reaction would be said to be regiospecific. Regioselectivity. where the groups at each end of the double bond are  reaction of nucleophilic radical attack is faster with alkenes than with alkynes. A-B where A is not equal to B) to a non-symmetrical alkene (i.e. Stereospecific In a stereospecific reaction, one stereoisomer of the reactant gives one stereoisomer of the product Since one product is favoured over the other, the reaction is said to be regioselective.</p></translate>
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