Question

Write a note on Kolbe's reaction

Answer 1

Kolbe’s reaction: When phenol reacts with sodium hydroxide, sodium phenoxide is obtained. Phenoxide ion being more reactive than phenol towards electrophilic substitution. Phenoxide undergoes electrophilic substitution with carbon dioxide at 398 K under pressure of 6 atm (a weak electrophile) followed by acid hydrolysis, salicylic acid is formed as major product.