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However, to date, it has been limited to electron\u2010rich arenes. Here we report a Lewis pair, composed of a highly Lewis acidic borenium ion and a weak pyridine base, can catalyze C\u2500H silylation of benzene and other unactivated arenes with H\n                    <jats:sub>2<\/jats:sub>\n                    SiAr\n                    <jats:sup>F<\/jats:sup>\n                    <jats:sub>2<\/jats:sub>\n                    (Ar\n                    <jats:sup>F<\/jats:sup>\n                    \u00a0=\u00a02,4,6\u2010trifluorophenyl) as silylation reagent under neat conditions. Unlike most of its noble metal counterparts, this metal\u2010free system does not require stoichiometric sacrificial hydrogen acceptors. Additionally, this system can be applied for direct C\u2500H silylation of polystyrene, opening a new avenue for the functionalization of polystyrene. Our mechanistic investigations revealed that the activation of H\n                    <jats:sub>2<\/jats:sub>\n                    SiAr\n                    <jats:sup>F<\/jats:sup>\n                    <jats:sub>2<\/jats:sub>\n                    by the Lewis pair leads to the formation of a pyridine\u2010coordinated silylium intermediate, which was isolated and characterized by X\u2010ray diffraction analysis. Kinetic isotope effect (KIE) studies and theoretical calculations suggest that the C\u2500H activation mediated by this silylium intermediate is likely the rate\u2010limiting step.\n                  <\/jats:p>","DOI":"10.1002\/anie.202520852","type":"journal-article","created":{"date-parts":[[2025,10,28]],"date-time":"2025-10-28T14:54:16Z","timestamp":1761663256000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["C\u2500H Silylation of Unactivated Arenes Catalyzed by a Borenium\/Pyridine Lewis Pair"],"prefix":"10.1002","volume":"64","author":[{"given":"Chuan","family":"Dong","sequence":"first","affiliation":[{"name":"Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry Fudan University  Shanghai 200438 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9559-8882","authenticated-orcid":false,"given":"Xinyue","family":"Tan","sequence":"additional","affiliation":[{"name":"Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry Fudan University  Shanghai 200438 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhen Hua","family":"Li","sequence":"additional","affiliation":[{"name":"Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry Fudan University  Shanghai 200438 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9129-0004","authenticated-orcid":false,"given":"Huadong","family":"Wang","sequence":"additional","affiliation":[{"name":"Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry Fudan University  Shanghai 200438 China"},{"name":"School of Chemistry and Chemical Engineering Guizhou University  Huaxi District Guiyang 550025 China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,10,28]]},"reference":[{"key":"e_1_2_8_1_1","volume-title":"Organosilicon Chemistry: Novel Approaches and Reactions","author":"Hiyama 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