Question

write the kolbe's reaction

Answer 1

heya mate here's your answer


When phenol is treated with sodium hydroxide, phenoxide ion is generated. The phenoxide ion generated is more reactive than phenol towards electrophilic aromatic substitution reaction. Hence it undergoes electrophilic substitution reaction with carbon dioxide which is a weak electrophile. Ortho-hydroxybenzoic acid (salicylic acid) is formed as the major product. This reaction is popularly known as Kolbe’s reaction. It is named after the scientist Hermann Kolbe.

Answer 2

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here is ur answer....

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KOLBE'S REACTION
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sodium salt of phenol on heating with carbon dioxide at 400 k under a pressure of 4 to 7 atmospheres lead to the formation of sodium salts of phenolic acids.These salts on acidification yield phenolic acids .

for example , when sodium phenoxide is heated with carbon dioxide under pressure , sodium salicylate is obtained as the major product.Sodium salicylate on acidification wirh a mineral acid , produces salicylic acid.

in the above reaction it if temperature is allowed to rise above 410 k , para product dominates .The reaction is called KOLBE'S REACTION.

or
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sodium phenoxide when heated with carbon dioxide at 400 k under a pressure of 4-7 atmospheres followed by acidification gives 2-hydroxybenzoic acid (salicylic acid) as the main product along with a small amount of 4-hydroxybenzoic acid
This reaction is called kolbe's reaction.

hope it will help you.


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