Carbon dioxide, a nontoxic, cheap and readily available greenhouse gas, acts as the ideal carbonyl source with similar function as the combination of CO and oxidants (‘CO 2 = CO + O’). We highlight this concept with recent advances of the lactamization and lactonization of C–H bond with CO 2 under redox-neutral or even transition-metal-free conditions.
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Yu et al. (2017) studied this question.