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1. Catalytic C–H Trifluoromethylation of Arenes and Heteroarenes via Visible Light Photoexcitation of a Co(III)–CF ₃ Complex

   https://doi.org/10.1021/acscatal.3c03832  

   Kuehner, Christopher S.; Hill, Andrew G.; Harris, Caleb F.; Owens, Christian A.; Bacsa, John; Soper, Jake D. (October 2023, ACS Catalysis)
2. Molybdenum-Promoted Synthesis of Isoquinuclidines with Bridgehead CF ₃ Groups

   https://doi.org/10.1021/jacs.9b10781  

   Wilde, Justin H.; Smith, Jacob A.; Dickie, Diane A.; Harman, W. Dean (November 2019, Journal of the American Chemical Society)
3. Solid-State ⁴⁵ Sc NMR Studies of Cp* ₂ Sc–OR (R = CMe ₂ CF ₃ , CMe(CF ₃ ) ₂ , C(CF ₃ ) ₃ , SiPh ₃ ) and Relationship to the Structure of Cp* ₂ Sc-Sites Supported on Partially Dehydroxylated Silica

   https://doi.org/10.1021/acs.organomet.9b00840  

   Culver, Damien B.; Huynh, Winn; Tafazolian, Hosein; Conley, Matthew P. (April 2020, Organometallics)
4. Uncovering a CF ₃ Effect on X‐ray Absorption Energies of [Cu(CF ₃ ) ₄ ] ⁻ and Related Copper Compounds by Using Resonant Diffraction Anomalous Fine Structure (DAFS) Measurements**

   https://doi.org/10.1002/anie.202313744  

   Alayoglu, Pinar; Chang, Tieyan; Yan, Connly; Chen, Yu‐Sheng; Mankad, Neal P. (November 2023, Angewandte Chemie International Edition)

   Abstract Understanding the electronic structures of high‐valent metal complexes aids the advancement of metal‐catalyzed cross coupling methodologies. A prototypical complex with formally high valency is [Cu(CF₃)₄]⁻(1), which has a formal Cu(III) oxidation state but whose physical analysis has led some to a Cu(I) assignment in an inverted ligand field model. Recent examinations of1by X‐ray spectroscopies have led previous authors to contradictory conclusions, motivating the re‐examination of its X‐ray absorption profile here by a complementary method, resonant diffraction anomalous fine structure (DAFS). From analysis of DAFS measurements for a series of seven mononuclear Cu complexes including1, here it is shown that there is a systematic trifluoromethyl effect on X‐ray absorption that blue shifts the resonant Cu K‐edge energy by 2–3 eV per CF₃, completely accounting for observed changes in DAFS profiles between formally Cu(III) complexes like1and formally Cu(I) complexes like (Ph₃P)₃CuCF₃(3). Thus, in agreement with the inverted ligand field model, the data presented herein imply that1is best described as containing a Cu(I) ion with dⁿcount approaching 10. 

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5. Aryl–CF ₃ Coupling from Phosphinoferrocene-Ligated Palladium(II) Complexes

   https://doi.org/10.1021/acs.organomet.8b00828  

   Ferguson, Devin M.; Bour, James R.; Canty, Allan J.; Kampf, Jeff W.; Sanford, Melanie S. (January 2019, Organometallics)