Home › UP Board Class 12 › chemistry › namedreactions › The carboxylation in Kolbe's reaction occurs pre…
The carboxylation in Kolbe's reaction occurs predominantly at the **ortho** position to the phenoxide because
Aphenoxide oxygen chelates $Na^+$ and delivers $CO_2$ ortho
Bpara gives an unstable carbocation
Cpara is sterically blocked by the OH
Dortho is the only kinetic site available
Answer & Solution
Correct answer: A. phenoxide oxygen chelates $Na^+$ and delivers $CO_2$ ortho
The sodium of the phenoxide coordinates with $CO_2$, holding it in proximity to the ortho position. The intramolecular delivery makes ortho substitution overwhelmingly favoured over para, even though both are activated.
Related questions
Phenol is industrially manufactured by the **cumene process** instead of Dow's process becFriedel–Crafts **acylation** is generally preferred over alkylation for installing a $-R$ Which aldehyde would NOT undergo aldol condensation but WOULD undergo Cannizzaro?Identify the correct conversion: $CH_3CN \xrightarrow{?} CH_3CHO$ (one step).Which of the following named reactions does **NOT** require an $\alpha$-hydrogen on the suThe **Balz–Schiemann reaction** converts $ArN_2^+$ to $ArF$ via which intermediate?The **Gattermann reaction** (not Gatterman–Koch) converts $ArN_2^+X^-$ to $ArX$ usingSandmeyer's reaction proceeds via which type of intermediate?