Bis(pertrifluoromethylcatecholato)silane

• Verfasst von: Thorwart, Thaddäus [VerfasserIn]
• Verfasst von: Roth, Daniel [VerfasserIn]
• Verfasst von: Greb, Lutz [VerfasserIn]
• Titel: Bis(pertrifluoromethylcatecholato)silane
• Titelzusatz: extreme Lewis Acidity broadens the catalytic portfolio of silicon
• Verf.angabe: Thaddäus Thorwart, Daniel Roth, and Lutz Greb
• Jahr: 2021
• Umfang: 6 S.
• Fussnoten: Gesehen am 12.04.2023
• Titel Quelle: Enthalten in: Chemistry - a European journal
• Ort Quelle: Weinheim : Wiley-VCH, 1995
• Jahr Quelle: 2021
• Band/Heft Quelle: 27(2021), 40, Seite 10422-10427
• ISSN Quelle: 1521-3765
• DOI: doi:10.1002/chem.202101138
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: catechol
• Sach-SW: deoxygenation
• Sach-SW: homogeneous catalysis
• Sach-SW: Lewis superacids
• Sach-SW: silicon
• K10plus-PPN: 1842061615
• K10plus-PPN:
  Universitätsbibliothek
• Lokale URL UB: Zum Volltext

Abstract

Given its earth abundance, silicon is ideal for constructing Lewis acids of use in catalysis or materials science. Neutral silanes were limited to moderate Lewis acidity, until halogenated catecholato ligands provoked a significant boost. However, catalytic applications of bis(perhalocatecholato)silanes were suffering from very poor solubility and unknown deactivation pathways. In this work, the novel per(trifluoromethyl)catechol, H2catCF3, and adducts of its silicon complex Si(catCF3)2 (1) are described. According to the computed fluoride ion affinity, 1 ranks among the strongest neutral Lewis acids currently accessible in the condensed phase. The improved robustness and affinity of 1 enable deoxygenations of aldehydes, ketones, amides, or phosphine oxides, and a carbonyl-olefin metathesis. All those transformations have never been catalyzed by a neutral silane. Attempts to obtain donor-free 1 attest to the extreme Lewis acidity by stabilizing adducts with even the weakest donors, such as benzophenone or hexaethyl disiloxane.