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 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 chosen from formamides and their acetals. 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.