Abstract
Although carbon dioxide (CO2) is an attractive renewable carbon source, its utilization to produce fine chemicals through the catalytic carboxylation of unactivated carbon–hydrogen (C–H) bonds is still very limited and remains a challenge, largely because CO2 is thermodynamically and kinetically stable. In particular, the generation of (hetero)aromatic carboxylic acids via a transition-metal-catalysed C–H carboxylation of arenes with CO2 is extremely rare. Here we report a ligand-enabled site-selective carboxylation of 2-arylphenols under atmospheric pressure of CO2 through a Rh2(OAc)4-catalysed and chelation-assisted C–H bond activation. Remarkably, the reaction occurs selectively on the less nucleophilic phenyl group with the promotion of a phosphine ligand, which overrides the site selectivity dictated by the well-known Kolbe–Schmitt type reaction. The non-acidic C–H bonds within several important classes of heterocycles were also efficiently carboxylated with this method. A mechanistic investigation revealed complexes of active catalysts and that this reaction proceeds under redox-neutral reaction conditions.

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Change history
29 April 2020
In the originally published PDF version of this Article, corresponding author information was missing for author Gang Li. This includes an email address in the affiliations section on the first page, and a line instructing readers who to address ‘correspondence and requests for materials’ to, on the final page. These have now been updated.
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Acknowledgements
We gratefully acknowledge the financial support from the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant no. XDB20000000), Natural Science Foundation of Fujian (2017J06007, 2017J05038), NSFC (Grant nos 21702206 and 21402198), the 100 Talents Program of Fujian Province, the National 1000 Youth Talents Program and the State Key Laboratory of Structural Chemistry.
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L.F. and S.L. performed the experiments and developed the reactions. S.L. did the mechanistic studies. Z.C. helped to develop the reaction of 2-pyridinylphenol. Y.D. helped to prepare the substrates. X.-Q.G., D.Y. and Q.-F.S. collected and analysed the X-ray crystallography data. L.-P.Z. collected the high-resolution mass spectra data of the complexes. G.L. designed and supervised the project and wrote the manuscript with feedback from L.F., S.L. and Z.C.
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Supplementary Methods; Supplementary Tables 1–7; Supplementary References; Supplementary Figures 1–98
CIF file for compound 5
Crystallographic data for compound 5, CCDC reference 1819284
CIF file for compound 6
Crystallographic data for compound 6, CCDC reference 1819415
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Fu, L., Li, S., Cai, Z. et al. Ligand-enabled site-selectivity in a versatile rhodium(ii)-catalysed aryl C–H carboxylation with CO2. Nat Catal 1, 469–478 (2018). https://doi.org/10.1038/s41929-018-0080-y
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DOI: https://doi.org/10.1038/s41929-018-0080-y
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