It is used in flavorings, foods, perfumes, and pharmaceuticals. Vanillin is used as a chemical intermediate in the manufacture of several important drugs and other products. 

Application

Production of vanillin from guaiacol is synthesized through electrophilic aromation substitution on reaction with glycoxylic acid; which results in synthesis of vanillylmandelic acid which is then converted 4-hydroxy-3-methoxyphenylglyoxylic acid and vanillin by oxidative decarboxylation