Process of preparation of methylene dicarboxylates

Abstract

The present invention relates to a process of preparation of a compound having formula (I): wherein R1 and R2 represent, independently of each other, an alkyl, a cycloalkyl or an aryl group, said alkyl, cycloalkyl or aryl group being optionally substituted; said process comprising a step i) of reacting: ○a compound A selected from the group consisting of: trioxane, polyoxymethylene deprived of hydroxyl end groups; ○a compound of formula (II): and ○a perfluorosulfonic acid; wherein step i) is carried out at a temperature T1 of at least

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