Boron(II) cations

• Verfasst von: Widera, Anna [VerfasserIn]
• Verfasst von: Vogler, Daniel [VerfasserIn]
• Verfasst von: Wadepohl, Hubert [VerfasserIn]
• Verfasst von: Kaifer, Elisabeth [VerfasserIn]
• Verfasst von: Himmel, Hans-Jörg [VerfasserIn]
• Titel: Boron(II) cations
• Titelzusatz: Interplay between Lewis-pair-acceptor and electron-donor properties
• Verf.angabe: Anna Widera, Daniel Vogler, Hubert Wadepohl, Elisabeth Kaifer, and Hans-Jörg Himmel
• E-Jahr: 2018
• Jahr: 04 July 2018
• Umfang: 4 S.
• Fussnoten: Gesehen am 16.03.2020
• Titel Quelle: Enthalten in: Angewandte Chemie / International edition
• Ort Quelle: Weinheim : Wiley-VCH, 1962
• Jahr Quelle: 2018
• Band/Heft Quelle: 57(2018), 35, Seite 11456-11459
• ISSN Quelle: 1521-3773
• DOI: doi:10.1002/anie.201806135
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: boron cations
• Sach-SW: diboranes
• Sach-SW: electron transfer
• Sach-SW: Lewis acids
• Sach-SW: nucleophilic boron
• K10plus-PPN: 1692609904

Abstract

Boron(III) cations are widely used as highly Lewis acidic reagents in synthetic chemistry. In contrast, boron(II) cations are extremely rare and their chemistry almost completely unknown. They are both Lewis acids and electron donors, properties that are commonly associated with catalytically active late-transition-metal complexes. This double reactivity pattern ensures a rich and diverse chemistry. Herein we report the facile synthesis of several new boron(II) cations starting with a special diborane with two easily exchangeable triflate substituents. By increasing the π-acceptor character of the neutral σ-donor reaction partners, first reactions were developed in which the combined Lewis acidity and electron-donor properties of boron(II) cations are applied for the reduction of organic molecules. The results of our study pave the way for applications of these unusual compounds in synthetic chemistry.