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The photochemical transformations of aryl thiols to other functional groups have been scarcely explored. Here the authors present a carboxylation of aryl thiols using 1 atmosphere of CO₂ under photoirradiative conditions, a methodology which can be extended to the degradation of polyphenylene sulfide.

Despite the importance of polycyclic carboxylic acids and derivatives in various fields, general methods for the arylcarboxylation of alkenes with CO₂ remain elusive. Here, the authors transform unactivated alkenes into high value-added polycyclic carboxylic acids and derivatives via visible-light photoredox-catalysis, using CO₂ as the one-carbon feedstock.

Transformations in organic chemistry are mainly limited to the incorporation of only one equivalent of the greenhouse gas CO₂ per substrate. Now, a visible-light photoredox-catalysed dicarboxylation of alkenes, allenes and arenes allows the incorporation of two CO₂ molecules into organic compounds.

Phosphonyl and carboxyl groups are valuable functional groups, however their simultaneous incorporation via catalytic difunctionalization of alkenes has not been realized yet. Here the authors report the phosphonocarboxylation of alkenes with CO₂ via visible-light photoredox catalysis.

The report for the multi-carbon homologation of alkynes with CO₂ to construct important non-conjugated alkynyl-containing acids is rare. Herein, the authors report alkynylcarboxylation of alkenes with CO₂ via photoredox and copper dual catalysis, affording non-conjugated alkynyl acids from readily available alkynes, alkenes and CO₂.

CO₂ conversion to valuable chemicals is of great interest in sustainable chemistry. Now, β-amino acids are synthesized by a dual catalytic strategy that enables the aminocarboxylation of alkenes using CO₂, proceeding via alkene radical anion intermediates that are generated using a designed binaphthol-derived photoredox catalyst.

The catalytic carboxylation of C(sp²)–H bonds using CO₂ is an efficient strategy to produce carboxylic acids; however, the carboxylation of azines is a challenge. Now, a visible-light-driven, thiolate-catalysed method for the carboxylation of azine C(sp²)–H bonds using CO₂ is reported, enabling the synthesis of N-heteroaromatic carboxylic acids with excellent regiocontrol.