|Chemical name||4-Hydroxybenzoic acid|
|Other names||p-Hydroxybenzoic acid|
|Molecular mass||138.12 g/mol|
|Melting point||214-217 °C|
|Disclaimer and references|
4-Hydroxybenzoic acid, or p-hydroxybenzoic acid, is a phenolic derivative of benzoic acid. It is a white crystalline solid that is slightly soluble in water and chloroform, but soluble to extremely soluble in alcohols, ether, and acetone.
4-Hydroxybenzoic acid is produced commercially from potassium phenoxide and carbon dioxide in the Kolbe-Schmitt reaction. It can also be produced in the laboratory by heating potassium salicylate with potassium carbonate to 240 °C, followed by treating with acid.