PROCESS FOR THE PREPARATION OF MONO- OR POLY-ALKOXYLATED AROMATIC COMPOUNDS

摘要

Process for the preparation of mono- or polyalkoxylated aromatic compounds from aromatic compounds carrying at least one halogen atom. The invention relates to a process for the preparation of alkoxylated aromatic compounds which consists in reacting an aromatic compound carrying at least one halogen atom with an alkali metal or alkaline-earth metal alcoholate in the presence of a copper catalyst, and characterised in that the operation is carried out in the presence of a cocatalyst which is an unsaturated compound chosen from organic isocyanides, isocyanates and alkynedioic esters. In an alternative embodiment, the invention is also aimed at the reaction of the product obtained after alkoxylation and carrying a hydroxyl group, with an alkylating agent. The invention is perfectly well suited for the preparation of 3,4,5-trimethoxybenzaldehyde and of 3,4-dimethoxybenzaldehyde.