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• W2897029472 abstract "The Lewis acid–base reaction between a nucleophilic hafnocene-based germylene and tris-pentafluorophenylborane (B(C6F5)3) to give the conventional B–Ge bonded species in almost quantitative yield is reported. This reaction is surprisingly slow, and during its course, radical intermediates are detected by EPR and UV–vis spectroscopy. This suggests that the reaction is initiated by a single electron-transfer step. The hereby-involved germanium radical cation was independently synthesized by oxidation of the germylene by the trityl cation or strong silyl-Lewis acids. A perfluorinated tetraarylborate salt of the radical cation was fully characterized including an XRD analysis. Its structural features and the results of DFT calculations indicate that the radical cation is a hafnium(III)-centered radical that is formed by a redox-induced electron transfer (RIET) from the ligand to the hafnium atom. This valence isomerization slows down the coupling of the radicals to form the polar Lewis acid–base product. The implications of this observation are briefly discussed in light of the recent finding that radical pairs are formed in frustrated Lewis pairs." @default.
• W2897029472 created "2018-10-26" @default.
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• W2897029472 date "2018-10-15" @default.
• W2897029472 modified "2023-09-30" @default.
• W2897029472 title "Evidence for a Single Electron Shift in a Lewis Acid–Base Reaction" @default.
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• W2897029472 doi "https://doi.org/10.1021/jacs.8b09214" @default.
• W2897029472 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30359019" @default.
• W2897029472 hasPublicationYear "2018" @default.
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