Logallo, Alessandra; Maddock, Lewis C H; Mu, Manting; Gravolg, Lisa; Jin, Na; Peñas Defrutos, Marconi; Meyer, Karsten; Garcia-Melchor, Max; Hevia, Eva (2024). Unlocking the Metalation Applications of TMP-powered Fe and Co(II) Bis(amides): Synthesis, Structure and Mechanistic Insights. Angewandte Chemie. International edition, 63(24), e202402907. Wiley 10.1002/anie.202402907
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Angew_Chem_Int_Ed_-_2024_-_Logallo_-_Unlocking_the_Metalation_Applications_of_TMP_powered_Fe_and_Co_II__Bis_amides__.pdf - Accepted Version Restricted to registered users only until 2 April 2025. Available under License Publisher holds Copyright. Download (2MB) |
Typified by LiTMP and TMPMgCl.LiCl, (TMP = 2,2,6,6-tetramethylpiperidide), s-block metal amides have found widespread applications in arene deprotonative metalation. On the contrary transition metal amides lack sufficient basicity to activate these substrates. Breaking new ground in this field, here we present the synthesis and full characterisation of earth abundant transition metals M(TMP)2 (M= Fe, Co). Uncovering a new reactivity profile towards fluoroarenes these amide complexes can promote direct M-H exchange processes regioselectively using one or two of their basic amide arms. Remarkably even when using perfluorinated substrate, selective CH-metalation occurs leaving C-F bonds intact. Their kinetic basicity can be boosted by LiCl or (nBu)4NCl additives which enables formation of kinetically activated ate species. Combining spectroscopic and structural studies with DFT calculations, mechanistic insights have been gained on how these low polarity metalation processes take place. M(TMP)2 can also be used to access ferrocene and cobaltocene by direct deprotonation of cyclopentadiene and to undergo efficient CO2 insertion of both amide groups under mild reaction conditions.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Logallo, Alessandra, Maddock, Lewis Caradoc Huw, Jin, Na, Hevia Freire, Eva |
Subjects: |
500 Science > 570 Life sciences; biology 500 Science > 540 Chemistry |
ISSN: |
1521-3773 |
Publisher: |
Wiley |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
04 Apr 2024 14:45 |
Last Modified: |
04 Jun 2024 00:14 |
Publisher DOI: |
10.1002/anie.202402907 |
PubMed ID: |
38563772 |
Uncontrolled Keywords: |
amide cobal fluoroarenes iron metalation |
BORIS DOI: |
10.48350/195557 |
URI: |
https://boris.unibe.ch/id/eprint/195557 |
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