Highly selective electrosynthesis of imines via electroreduction coupling of nitroarenes with aryl aldehydes on Co9S8 with positively charged sulfur vacancies
The electrocatalytic synthesis of imines through the reductive imination of nitroarenes with alde-hydes is a facile,environmentally friendly,and valuable process.In this study,high selectivity elec-trosynthesis of imines was realized through the electrocatalytic C-N coupling reaction between nitroarenes and aryl aldehydes on Co9S8 nanoflowers with rich sulfur vacancies(Co9S8-Vs).Compar-ative experiments revealed that positively charged sulfur vacancies play a pivotal role in boosting catalytic selectivity towards imines.Electron-deficient sulfur vacancies intensified the adsorption of negatively charged Ph-NO2,thereby enhancing the conversion rate of the electrochemical nitroben-zene-reduction reaction(eNB-RR).Simultaneously,sulfur vacancies augmented the adsorption capability of negatively charged Ph-CHO,enriching Ph-CHO species at the electrode interface and expediting the Schiff base condensation reaction rate.The experimental results show that the reac-tion conditions can satisfy the different nitroarenes and aryl aldehydes in the electrocatalytic aque-ous-phase system under mild conditions to obtain the corresponding imine products in high selec-tivity.This study provides a facile and environmentally friendly pathway for future electrocatalytic synthesis of imine.
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