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1. Cobalt−NHC Catalyzed C(sp ² )−C(sp ³ ) and C(sp ² )−C(sp ² ) Kumada Cross‐Coupling of Aryl Tosylates with Alkyl and Aryl Grignard Reagents

   https://doi.org/10.1002/cctc.202001347  

   Piontek, Aleksandra; Ochędzan‐Siodłak, Wioletta; Bisz, Elwira; Szostak, Michal (November 2020, ChemCatChem)

   Abstract The first cobalt‐catalyzed cross‐coupling of aryl tosylates with alkyl and aryl Grignard reagents is reported. The catalytic system uses CoF₃and NHCs (NHC=N‐heterocyclic carbene) as ancillary ligands. The reaction proceeds via highly selective C−O bond functionalization, leading to the corresponding products in up to 98 % yield. The employment of alkyl Grignard reagents allows to achieve a rare C(sp²)−C(sp³) cross‐coupling of C−O electrophiles, circumventing isomerization and β‐hydride elimination problems. The use of aryl Grignards leads to the formation of biaryls. The C−O cross‐coupling sets the stage for a sequential cross‐coupling by exploiting the orthogonal selectivity of the catalytic system. 

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2. Realizations of rigid C ^* -tensor categories as bimodules over GJS C ^* -algebras

   https://doi.org/10.1063/5.0015294  

   Hartglass, Michael; Hernández Palomares, Roberto (August 2020, Journal of Mathematical Physics)

   null (Ed.)
3. Ligand Reorganization in the Coordination Sphere of a CCC-NHC Pincer Fe Complex and Transient Absorption Spectroscopic Characterization of [( ^Bu C ⁱ C ⁱ C ^Bu ) ₂ Fe]I

   https://doi.org/10.1021/acs.organomet.3c00386  

   Mensah, Joshua; Adiraju, Venkata K.; Cope, James D.; Lamb, Robert W.; Li, Xiao X.; Donnadieu, Bruno; Rubtsov, Igor V.; Webster, Charles Edwin; Hollis, T. Keith (February 2024, Organometallics)

   Monoligated and bis-ligated CCC-NHC pincer Fe complexes with n-butyl substituents have been synthesized by the Zr metalation/transmetalation route. Both the direct metalation/transmetalation and transmetalation from the isolated (BuCiCiCBu)ZrNMe2Cl2, 3, yielded the octahedrally coordinated Fe(III) bis-ligated complex [(BuCiCiCBu)2Fe]Cl, 2a. Transmetalation from in situ and isolated (BuCiCiCBu)ZrCl3, 5, in the presence of excess TMSCl and 1 equiv of the Fe source yielded the monoligated (BuCiCiCBu)FeCl2, 4. Conditions that convert [(BuCiCiCBu)2Fe]+, 2, to (BuCiCiCBu)FeCl2, 4, complex have been found. Characterization included 1H NMR, UV−visible, femtosecond transient absorption spectroscopies, TDDFT computations, and mass spectroscopy along with X-ray crystallographic structure determinations. 

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4. Ni-Electrocatalytic Enantioselective Doubly Decarboxylative C(sp ³ )–C(sp ³ ) Cross Coupling

   https://doi.org/10.1021/jacs.3c03337  

   Gao, Yang; Zhang, Benxiang; He, Jiayan; Baran, Phil S. (May 2023, Journal of the American Chemical Society)
5. Nickel(IV) Intermediates in Aminoquinoline-Directed C(sp ² )–C(sp ³ ) Coupling

   https://doi.org/10.1021/jacs.2c10778  

   Milbauer, Michael W.; Kampf, Jeff W.; Sanford, Melanie S. (November 2022, Journal of the American Chemical Society)