Regioselectivity
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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 position a reagent will affect, such as which proton a strong base will abstract from an organic molecule, or when along a substituted benzene ring another substituent will add.
Regioselectivity in ring-closure reactions is governed by the Baldwin's rules.
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