Research progress of synthesis of aromatic aldehydes by indirect electro-oxidation method

Principles of synthesis of aromatic aldehydes by indirect electro-oxidation are introduced. Present situation of synthesis of aromatic aldehydes by indirect electro-oxidation with Mn3+/Mn2+, Ce4+/Ce3+, Co3+/Co2+ and Cr3O72-/Cr3+ as mediators are reviewed. A brief introduction of Ag2+/Ag+ being used as catalyst and the application of phase transference catalyst are given. Prospect of this field is previewed in some aspect. Research direction in the future are pointed out, such as further perfection of the electrode material selection and electrolysis without membrane in commercial practice, more attention paid to study and popularization of indirect electro-oxidation, especially of the alkoxy benzaldehydes, and study on the basic theory also should be enhanced.