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In Kolbe's reaction, instead of phenol,...

In Kolbe's reaction, instead of phenol, phenoxide ion is treated with carbon dioxide. Why?

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Carbon dioxide (O=C=O) is a weak electrophile. For its needs a ring which is highly activated. Now phenoxide ion with a negative charge on oxygen is more reactive towards the attacking electrophile as compared to phenol. That is why, in Kolbe's reaction phenoxide ion is preferred over phenol for reaction wiht carbon dioxide. For mechanism, consult section 16
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