Kolbe–Schmitt reaction (phenol → ortho-hydroxybenzoic acid) (Phenoxide attacks electrophilic carbon of CO₂; ortho-carboxylation after acidification)

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Phenoxide attacks electrophilic carbon of CO₂; ortho-carboxylation after acidification (salicylic acid synthesis)

What each symbol means

SymbolWhat it stands for
CO₂Electrophile (dry ice / pressure in industrial variants)
C₆H₅OHPhenol

When to use this

Sodium phenoxide; CO₂; heating; high pressure in Kolbe–Schmitt industrial conditions; acid workup gives salicylic acid.