Abstract
Resulting from the drastic increase of atmospheric CO2 concentration day by day, global warming has become a serious environmental issue nowadays. The fixation of CO2 to obtain desirable, economically competitive chemicals has recently received considerable attention. This work investigates the fixation of CO2 along with three bromopyridines via a facile electrochemical method using a silver cathode to synthesize picolinic acids, which are important industrial and fine chemicals. Cyclic voltammetry is employed to investigate the cyclic voltammetric behaviour of bromopyridines. In addition, systematic study is conducted to study the relationships between the picolinic acids' yield and the electrolysis conditions and intrinsic parameters. The results show that the target picolinic acids' yields are strongly dependent on various conditions such as solvent, supporting electrolyte, current density, cathode material, charge passed, temperature and the nature of the substrates. Moreover, in the studied electrode materials such as Ag, Ni, Ti, Pt and GC, electrolysis and cyclic voltammetry show that Ag has a good electrocatalytic effect on the reduction and carboxylation of bromopyridine. This facile electrochemical route for fixation of CO2 provides an indispensable reference for the conversion and utilization of CO2 under mild conditions.
Highlights
Nowadays, the sustainable development of society and its related ecological environment, resources and economy have become the& 2018 The Authors
Electrochemical carboxylation of heterocyclic halides is one of the most useful methods for obtaining heterocyclic carboxylic acids, which are a class of important compounds, and some of them are of meaning to the industry of fine chemicals such as anti-inflammatory drugs [41,42,43]
We study the electrosynthesis of picolinic acids (2) from three bromopyridines (1a, 1b, 1c) and CO2 on Ag electrodes
Summary
The sustainable development of society and its related ecological environment, resources and economy have become the. That is why much attention is drawn to the study of the electrocarboxylation of organic halides [30,31,32,33]. Some of these reaction pathways are important for producing fine chemicals such as anti-inflammatory drugs. To make the electrosynthesis of heterocyclic carboxylic acid industrially and commercially feasible, it is necessary to develop a low-cost, environmentally friendly, high-yield synthetic route. This study is to establish a facile electrochemical method for introducing CO2 into 1 using Ag as a cathode to yield 2 under mild conditions, providing a more effective and environmentally friendly method for the fixation of CO2
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