Synthesis and Characterization of a Magnesium Boryl and a Beryllium-Substituted Diazaborole

Deepak Dange, Albert Paparo, Cameron Jones

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Abstract

Reaction of a lithium boryl, [(THF)2Li{B(DAB)}] (DAB=[(DipNCH)2]2−, Dip=2,6-diisopropylphenyl), with a dinuclear magnesium(I) compound [{(MesNacnac)Mg}2] (MesNacnac=[HC(MeCNMes)2], Mes=mesityl) unexpectedly afforded a rare example of a terminal magnesium boryl species, [(MesNacnac)(THF)Mg{B(DAB)}]. Attempts to prepare the magnesium boryl via a salt metathesis reaction between the lithium boryl and a β-diketiminato magnesium iodide compound, instead led to an intractable mixture of products. Similarly, reaction of the lithium boryl with a β-diketiminato beryllium bromide precursor, [(DepNacnac)BeBr] (Dep=2,6-diethylphenyl) did not give a beryllium boryl, but instead afforded an unprecedented example of a beryllium substituted diazaborole heterocycle, [{(DepNacnac)Be(4-DAB−H)}BBr]. For sake of comparison, the same group 2 halide precursor compounds were treated with a potassium gallyl analogue of the lithium boryl, viz. [(tmeda)K{:Ga(DAB)}] (tmeda=N,N,N’,N’-tetramethylethylenediamine), but no reactions were observed.

Original languageEnglish
Number of pages5
JournalChemistry-An Asian Journal
DOIs
Publication statusAccepted/In press - 17 Jun 2020

Keywords

  • beryllium
  • boryl
  • gallyl
  • magnesium(I)
  • steric bulk

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