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Amplifying Lewis acidity by oxidation: leveraging the redox-activity of bis(3,6-di-tert-butyl-catecholato)silane

Bis(catecholato)silanes were showcased as strong Lewis acids, while their inherent redox activity remained unexplored in this context. In the present work, we study the oxidation of monomeric bis(3,6-di-tert-butyl-catecholato)silane (1), leading to the Lewis superacidic radicalic silylium ionradical...

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Bibliographic Details
Main Authors: Thorwart, Thaddäus (Author) , Schmitt, Manuel (Author) , Greb, Lutz (Author)
Format: Article (Journal)
Language:English
Published: 07 January 2025
In: Dalton transactions
Year: 2025, Volume: 54, Issue: 1, Pages: 65-69
ISSN:1477-9234
DOI:10.1039/D4DT03176H
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1039/D4DT03176H
Verlag, kostenfrei, Volltext: https://pubs.rsc.org/en/content/articlelanding/2025/dt/d4dt03176h
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Author Notes:Thaddäus Thorwart, Manuel Schmitt and Lutz Greb
Description
Summary:Bis(catecholato)silanes were showcased as strong Lewis acids, while their inherent redox activity remained unexplored in this context. In the present work, we study the oxidation of monomeric bis(3,6-di-tert-butyl-catecholato)silane (1), leading to the Lewis superacidic radicalic silylium ionradical 1˙+ (FIA 784 kJ mol−1). Oxidation of 1 with [N(p-C6H4Br)3][B(C6F5)4] yielded [1][B(C6F5)4], displaying strong catalytic activity in the Friedel-Crafts-dimerization, hydrodeoxygenation and carbonyl-olefin-metathesis. It demonstrates how Lewis acidity can be amplified through oxidation without needing an add-on redox-active substituent. Instead, it synergizes the constraining effect of catecholates with their inherent redox non-innocence to unlock enhanced catalytic performance.
Item Description:Online verfügbar: 29. November 2024
Gesehen am 06.06.2025
Physical Description:Online Resource
ISSN:1477-9234
DOI:10.1039/D4DT03176H

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