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  • Title: The synthesis and reagent properties of magnesium tetrakis(4-tert.butylphenyl)borate.
    Author: Pacey GE, Moore CE.
    Journal: Talanta; 1981 Sep; 28(9):688-90. PubMed ID: 18962982.
    Abstract:
    Magnesium tetrakis(4-tert.butylphenyl)borate, Mg(BAr(4))(2), has been synthesized and screened for its properties as an analytical reagent. Although rather more selective than tetraphenylborate, the compound surprisingly precipitates sodium and proves a good gravimetric reagent for its determination. Quaternary ammonium and trialkylamine ions are precipitated only slowly (in contrast to the rapid precipitation with tetraphenylborate). The new compound exhibits better resistance to proton-initiated decomposition and to free radical attack than the other known tetra-arylborates. The presence of the parent peak, NaBAr(+)(4), in the mass spectrum of the sodium salt is further proof of the remarkable stability. The other tetra-arylborates do not produce parent peaks in the mass spectra of their precipitates.
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