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      Novel H2 activation by a tris[3,5-bis(trifluoromethyl)phenyl]borane frustrated Lewis pair

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      Dalton Transactions
      Royal Society of Chemistry (RSC)

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          Abstract

          Tris[3,5-bis(trifluoromethyl)phenyl]borane (1, BArF(18)), has been synthesised on a practical scale for the first time. According to the Gutmann-Beckett method it is a more powerful Lewis acid than B(C(6)F(5))(3). It forms a 'frustrated Lewis pair' with 2,2,6,6-tetramethylpiperidine which cleaves H(2) to form a salt containing the novel anion [μ-H(BArF(18))(2)](-).

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          Most cited references34

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          Frustrated Lewis Pairs: Metal-free Hydrogen Activation and More

          Sterically encumbered Lewis acid and Lewis base combinations do not undergo the ubiquitous neutralization reaction to form "classical" Lewis acid/Lewis base adducts. Rather, both the unquenched Lewis acidity and basicity of such sterically "frustrated Lewis pairs (FLPs)" is available to carry out unusual reactions. Typical examples of frustrated Lewis pairs are inter- or intramolecular combinations of bulky phosphines or amines with strongly electrophilic RB(C(6)F(5))(2) components. Many examples of such frustrated Lewis pairs are able to cleave dihydrogen heterolytically. The resulting H(+)/H(-) pairs (stabilized for example, in the form of the respective phosphonium cation/hydridoborate anion salts) serve as active metal-free catalysts for the hydrogenation of, for example, bulky imines, enamines, or enol ethers. Frustrated Lewis pairs also react with alkenes, aldehydes, and a variety of other small molecules, including carbon dioxide, in cooperative three-component reactions, offering new strategies for synthetic chemistry.
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            Reversible Metal-Free Carbon Dioxide Binding by Frustrated Lewis Pairs

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              Noncoordinating Anions—Fact or Fiction? A Survey of Likely Candidates

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                Author and article information

                Journal
                ICHBD9
                Dalton Transactions
                Dalton Trans.
                Royal Society of Chemistry (RSC)
                1477-9226
                1477-9234
                2012
                2012
                : 41
                : 30
                : 9019
                Article
                10.1039/c2dt30384a
                22532230
                d87a42bb-b02d-4b98-9522-5c6555e771b5
                © 2012
                History

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