4-Hydroxy-3-Methylbenzoic Acid CAS 499-76-3

4-Hydroxy-3-methylbenzoic acid CAS 499-76-3 is derived from o-cresol by acid methylation. Add o-cresol and 50% sodium hydroxide aqueous solution to the reaction kettle. After treatment with steam, press in carbon dioxide at 160 ° C or lower to obtain crude o-cresol sodium p-formate, which is then neutralized with sulfuric acid and refined. The finished product was obtained by vacuum drying with a yield of 88%.