# Rate of reaction of silver salts of carboxylic acids having different alkyl groups towards Hunsdiecker Reaction

Hunsdiecker reaction follows free radical mechanism but it is given that rate of reaction with different alkyl groups (R) attached to silver salts of carboxylic acid follows the order as follows

Primary > Secondary > Tertiary (Rate)

But free radical stability is exactly opposite!

Primary < Secondary < Tertiary (Stability Free Radicals)

What can be the reason for this kind of trend in this reaction?

I'm attaching the reaction mechanism for reference.

• The RCOO$\cdot$ radicals are formed for all R. This radical losses CO$_2$, which is an irreversible step. Than the R$\cdot$ is formed, irrespective of which type of radical it is. Jan 8, 2018 at 16:21