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Regioselectivity
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Everything about Regioselectivity totally explained

In chemistry, regioselectivity is the preference of one direction of chemical bond making or breaking over all other possible directions . It can often apply to which of many possible positions a reagent will affect, such as which proton a strong base will abstract from an organic molecule, or where on a substituted benzene ring a further substituent will add. A specific example is a halohydrin formation reaction with 2-propenylbenzene :
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The reaction product is a mixture of two isomers and the regioselectivity is said to be poor.
   Regioselectivity in ring-closure reactions is subject to Baldwin's rules.

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