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<p>Branched PFOA and PFOS have shorter half-lives, lower toxicity, and weaker serum protein binding than linear ones, offering better environmental and health safety. Yet methods to access such branched motifs remain under developed. We now introduce a one-step dehydroxy-perfluoro-<i>tert</i>-butylation of alcohols, in which perfluoro-<i>tert</i>-butyl phenyl sulfone serves both to activate the C–O bond and to deliver the perfluoro-<i>tert</i>-butyl group. Mechanistic studies—including DFT calculations—reveal that perfluoro-<i>tert</i>-butyl phenyl sulfone first generates perfluoroisobutylene in situ to effect C–O bond cleavage, after which a catalytic iodide engages in the C–C bond-forming event. Remarkably, the isolated perfluoro-<i>tert</i>-butyl anion salt, characterized by single-crystal X-ray diffraction, displays significant negative hyperconjugation, as evidenced by the elongated C–F bonds. This operationally simple protocol tolerates a wide array of functional groups and complex substrates, providing rapid access to branched perfluoroalkyl scaffolds with broad implications for drug discovery and advanced materials.</p>

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Dehydroxy-Perfluoro-tert-butylation of alcohols with PhSO2C(CF3)3 and insights into the structure of the [C(CF3)3]− anion

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月26日

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  • Kaidi Zhu,
  • Qinyu Luo,
  • Pengcheng Xu,
  • Zhigang Ni,
  • Shuo Sun,
  • Mingyou Hu,
  • Chuanfa Ni,
  • Jinbo Hu

摘要

Branched PFOA and PFOS have shorter half-lives, lower toxicity, and weaker serum protein binding than linear ones, offering better environmental and health safety. Yet methods to access such branched motifs remain under developed. We now introduce a one-step dehydroxy-perfluoro-tert-butylation of alcohols, in which perfluoro-tert-butyl phenyl sulfone serves both to activate the C–O bond and to deliver the perfluoro-tert-butyl group. Mechanistic studies—including DFT calculations—reveal that perfluoro-tert-butyl phenyl sulfone first generates perfluoroisobutylene in situ to effect C–O bond cleavage, after which a catalytic iodide engages in the C–C bond-forming event. Remarkably, the isolated perfluoro-tert-butyl anion salt, characterized by single-crystal X-ray diffraction, displays significant negative hyperconjugation, as evidenced by the elongated C–F bonds. This operationally simple protocol tolerates a wide array of functional groups and complex substrates, providing rapid access to branched perfluoroalkyl scaffolds with broad implications for drug discovery and advanced materials.