PROCESS FOR THE PREPARATION OF 3,4-METHYLENEDIOXYPROPIOPHENONE

The invention relates to a process for the preparation of 1-(1,3-benzodioxol-5-yl)-l-propanone comprising the step of reacting 3,4-dimethylendioxybenzene with propionic anhydride in the presence of a bulk or supported catalyst, being said catalyst selected from the group of a sulphonated cross-linked divinylbenzene resin, a sulphonated cross-linked divinylbenzene resin partially exchanged with iron, zinc or gallium, a perfhtorinated sulphonic resin, and a perfhtorinated sulphonic resin partially exchanged with iron, zinc or gallium, wherein said catalyst has an average particle size from 1 pm to 300 pm, preferably from 1 pm to 180 pm, more preferably from 1 pm to 100 pm as measured with DLS (Dynamic light scattering) or a granulometer. The process is advantageously carried out at stoichiometric ratio between the reagents and with a continuos process.