Question

What is the other name for Anti Markovnikov rule?

Answer 1

Anti-Markovnikov rule: Anti Markovnikov rule describes that in addition to reactions of alkenes or alkynes, the proton is added to the carbon atom that has the least number of hydrogen atoms attached to it.

• Anti Markovnikov rule helps to define the product of an addition reaction where peroxy acids are used as the catalyst.
• It is also known as the peroxide effect or the Kharasch effect.

Example: Reaction of propene with hydrogen bromide in presence of a catalyst

• Propene $({\mathrm{CH}}_3\mathrm{CH}={\mathrm{CH}}_2)$ reacts with Hydrogen bromide $\left(\mathrm{HBr}\right)$ in the presence of benzoyl peroxide to give $1-$bromopropane $\left({\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}\right)$ as the major product, the reaction is as follows,
• ${\mathrm{CH}}_3\mathrm{CH}={\mathrm{CH}}_2+\mathrm{HBr}\stackrel{\mathrm{Benzoyl}\mathrm{peroxide}}{\to }{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{Br}$