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Isolation of Base Stabilized Fluoroborylene and its Radical Cation

Abstract

Herein, we report the synthesis and characterization of the metal free low valent fluoroborylene [(Me-cAAC)2BF] (1) stabilized by cyclic (alkyl)(amino) carbene (cAAC). The fluoroborylene 1 is obtained by reductive defluorination of Me-cAAC:BF3 with 2.0 equivalents of KC8 in the presence of 1.0 equivalent of Me-cAAC. Due to its highly electron rich nature, 1 underwent one-electron oxidation with 1.0 equivalent of lithium tetrakis(pentafluorophenyl)borate [LiB(C6F5)4] to form the radical cation [(Me-cAAC)2BF]∙+[B(C6F5)4]- (2). DFT studies suggested that the lone pair of electrons is localized on boron atom in 1, which explains its unprecedented reactivity. Both compounds 1 and 2 were characterized by X-ray crystallography. The radical cation 2 was studied by EPR spectroscopy.

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Publication details

The article was accepted on 09 May 2019 and first published on 10 May 2019


Article type: Communication
DOI: 10.1039/C9DT01899A
Dalton Trans., 2019, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Isolation of Base Stabilized Fluoroborylene and its Radical Cation

    H. W. Roesky, S. K. Sarkar, M. M. Siddiqui, S. Kundu, J. Kretsch, P. Stollberg, R. Herbst-Irmer, D. Stalke, M. Ghosh, A. C. Stückl, S. Ghorai, E. D. Jemmis, B. Schwederski and W. Kaim, Dalton Trans., 2019, Accepted Manuscript , DOI: 10.1039/C9DT01899A

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