Hydrohalogenation
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Hydrohalogenation is the electrophilic addition of acids like hydrogen chloride or hydrogen bromide to alkenes to yield the corresponding haloalkanes.
- CH3-CH=CH2 + HBr → CH3-CHBr-CH3
If the two carbon atoms at the double bond are linked to a different number of hydrogen atoms, the halogen is found preferentially at the carbon with less hydrogen substituents, an observation known as Markovnikov's rule.
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