CH Carboxylation with CO 2

Abstract In this article, we outline the development of using CO 2 as the carboxyl source in CH bond functionalization. As the main products of CO 2 ‐involving organic synthesis, carboxylic acids and their derivatives are highly important and widely used. Among the numerous methods to generate carboxylic acids, the direct carboxylation of CH bonds with CO 2 is the most efficient in an atom‐economical way. The development of the direct carboxylation of different CH bonds with CO 2 is summarized separately. A summary and outlook of this area are presented.