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Tuning the Nucleophilicity of Electron-Rich Diborane(4) Compounds with Bridging Guanidinate Substituents by Substitution

Abstract

Diborane(4) compounds are versatile reagents in synthetic chemistry. Generally, diboranes(4) with sp2-hybridized boron atoms react as electrophiles. By contrast, the chemistry of nucleophilic diborane(4) compounds with two sp3-hybridized boron atoms is very much underdeveloped. In this work we systematically vary the substituents of electron-rich diborane(4) compounds with bridging guanidinate substituents. In this way, five new diboranes are synthesized and fully characterized. Using quantum chemical computations, we show that the electronic properties and reactivity of these compounds can be rationally varied by the choice of substituents. The HOMO energies, adiabatic ionization energies and proton affinities are considered as parameters to compare the chemical properties for these unusual compounds.

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Publication details

The article was received on 24 Nov 2017, accepted on 23 Dec 2017 and first published on 26 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT04433J
Citation: Dalton Trans., 2017, Accepted Manuscript
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    Tuning the Nucleophilicity of Electron-Rich Diborane(4) Compounds with Bridging Guanidinate Substituents by Substitution

    J. Horn, A. Widera, S. Litters, E. Kaifer and H. Himmel, Dalton Trans., 2017, Accepted Manuscript , DOI: 10.1039/C7DT04433J

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