Lewis Superacidic Tellurenyl Cation-Induced Electrophilic Activation of an Inert Carborane

0546386 - ÚACH 2022 RIV DE eng J - Článek v odborném periodiku
Hejda, M. - Duvinage, D. - Lork, E. - Lyčka, A. - Černošek, Z. - Macháček, Jan - Makarov, S. - Ketkov, S. - Mebs, S. - Dostál, L. - Beckmann, J.
Lewis Superacidic Tellurenyl Cation-Induced Electrophilic Activation of an Inert Carborane.
Chemistry - A European Journal. Roč. 27, č. 59 (2021), s. 14577-14581. ISSN 0947-6539. E-ISSN 1521-3765
Institucionální podpora: RVO:61388980
Klíčová slova: bond activation * boron * carboranes * Lewis superacids * tellurium
Obor OECD: Inorganic and nuclear chemistry
Impakt faktor: 5.020, rok: 2021
Způsob publikování: Open access

The aryltellurenyl cation [2-(tBuNCH)C6H4Te]+, a Lewis super acid, and the weakly coordinating carborane anion [CB11H12]−, an extremely weak Brønsted acid (pKa=131.0 in MeCN), form an isolable ion pair complex [2-(tBuNCH)C6H4Te][CB11H12], in which the Brønsted acidity (pKa 7.4 in MeCN) of the formally hydridic B−H bonds is dramatically increased by more than 120 orders of magnitude. The electrophilic activation of B−H bonds in the carborane moiety gives rise to a proton transfer from boron to nitrogen at slightly elevated temperatures, as rationalized by the isolation of a mixture of the zwitterionic isomers 12- and 7-[2-(tBuN{H}CH)C6H4Te(CB11H11)] in ratios ranging from 62 : 38 to 80 : 20.
Trvalý link: http://hdl.handle.net/11104/0324928