Increasing the Brønsted acidity of Ph2PO2H by the Lewis acid B(C6F5)3. Formation of an eight-membered boraphosphinate ring [Ph2POB(C6F5)2O]2

Ralf Kather; Elena Rychagova; Paula Sanz Camacho; Sharon E. Ashbrook; J. Derek Woollins; Lars Robben; Enno Lork; Sergey Ketkov; Jens Beckmann

doi:10.1039/C6CC06102H

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Increasing the Brønsted acidity of Ph₂PO₂H by the Lewis acid B(C₆F₅)₃. Formation of an eight-membered boraphosphinate ring [Ph₂POB(C₆F₅)₂O]₂†

Ralf Kather,^a Elena Rychagova,^b Paula Sanz Camacho,^c Sharon E. Ashbrook,^c J. Derek Woollins,^c Lars Robben,^a Enno Lork,^a Sergey Ketkov*^bd and Jens Beckmann*^a

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* Corresponding authors

^a Institut of Inorganic Chemistry and Crystallography, Bremen University, Leobener Straße, 28359 Bremen, Germany
E-mail: j.beckmann@uni-bremen.de

^b G. A. Razuvaev Institute of Organometallic Chemistry RAS, 49 Tropinin St., 603950 Nizhny Novgorod, Russian Federation
E-mail: sketkov@iomc.ras.ru

^c EaStChem. School of Chemistry, University of St. Andrews, St. Andrews, Fife KY16 9ST, UK

^d N. I. Lobachevsky Nizhny Novgorod State University, Gagarin ave. 23, 603950 Nizhny Novgorod, Russian Federation

Abstract

Autoprotolysis of the metastable acid (C₆F₅)₃BOPPh₂OH, prepared in situ by the reaction of the rather weak Brønsted acid Ph₂PO₂H with the strong Lewis acid B(C₆F₅)₃, gave rise to the formation of the eight-membered ring [Ph₂POB(C₆F₅)₂O]₂ and C₆F₅H. The conjugate base was isolated as stable sodium crown ether salt [Na(15-crown-5)][Ph₂PO₂B(C₆F₅)₃].

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DOI: https://doi.org/10.1039/C6CC06102H
Article type: Communication
Submitted: 24 Jul 2016
Accepted: 05 Aug 2016
First published: 05 Aug 2016
This article is Open Access

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Chem. Commun., 2016,52, 10992-10995

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Increasing the Brønsted acidity of Ph₂PO₂H by the Lewis acid B(C₆F₅)₃. Formation of an eight-membered boraphosphinate ring [Ph₂POB(C₆F₅)₂O]₂

R. Kather, E. Rychagova, P. Sanz Camacho, S. E. Ashbrook, J. D. Woollins, L. Robben, E. Lork, S. Ketkov and J. Beckmann, Chem. Commun., 2016, 52, 10992 DOI: 10.1039/C6CC06102H

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