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For direct esterifications typical catalysts include basic catalysts such as alkali metal hydroxides or carbonates, such as sodium or potassium hydroxide or carbonate, particularly potassium carbonate; or acidic catalysts, such as sulphonic acids e.g. p-toluene sulphonic acid or phosphorus oxyacids such as phosphoric acid, or, particularly if it is desirable to avoid colour forming oxidation react
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