Increasing the Brønsted acidity of Ph2PO2H by the Lewis acid B(C6F5)3. Formation of an eight-membered boraphosphinate ring [Ph2POB(C6F5)2O]2
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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].
Kather , R , Rychagova , E , Camacho , P S , Ashbrook , S E , Woollins , J D , Robben , L , Lork , E , Ketkov , S & Beckmann , J 2016 , ' Increasing the Brønsted acidity of Ph 2 PO 2 H by the Lewis acid B(C 6 F 5 ) 3 . Formation of an eight-membered boraphosphinate ring [Ph 2 POB(C 6 F 5 ) 2 O] 2 ' Chemical Communications , vol 52 , no. 73 , pp. 10992-10995 . DOI: 10.1039/c6cc06102h
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The Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged for financial support. The theoretical part of this work was supported by the Russian Science Foundation (Project 14-13-00832).
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