Construction of a Diverse Range of Boron Heterocycles via Ring Expansion of a Carboranyl‐Substituted 9‐Borafluorene

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Abstract: Direct insertion of unsaturated substrates into a five‐membered borole ring is a useful method to obtain valuable heterocycles containing one or more three‐coordinate boron atoms. A highly Lewis acidic 9‐o‐carboranyl‐9‐borafluorene, in which the o‐carboranyl substituent is connected via one of the cluster carbon atoms to the boron atom of the 9‐borafluorene unit, was found to react with a vast array of unsaturated molecules, such as alkynes, aldehydes and various organic azides, to form larger boraheterocyclic products. The ring expansion reactions of the central borole ring proceed rapidly at room temperature, cementing the role of the o‐carboranyl substituent in enhancing the insertion reactivity of 9‐borafluorenes.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: Construction of a Diverse Range of Boron Heterocycles via Ring Expansion of a Carboranyl‐Substituted 9‐Borafluorene ; day:27 ; month:03 ; year:2023 ; extent:14
Chemistry - a European journal ; (27.03.2023) (gesamt 14)

Creator: Bischof, Tobias
Beßler, Lukas
Krummenacher, Ivo
Erhard, Leon
Braunschweig, Holger
Finze, Maik

DOI: 10.1002/chem.202300210

URN: urn:nbn:de:101:1-2023032815110598084479

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 14.08.2025, 10:54 AM CEST

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Bischof, Tobias
Beßler, Lukas
Krummenacher, Ivo
Erhard, Leon
Braunschweig, Holger
Finze, Maik

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Construction of a Diverse Range of Boron Heterocycles via Ring Expansion of a Carboranyl‐Substituted 9‐Borafluorene

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Other Objects (12)

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