The reaction 2 hmpa·BF3⇌ BF2(hmpa)2++ BF4– occurs spontaneously in the hexamethylphosphoramide (hmpa)–BF3 system. The degree of ionization for the above reaction is 0.13 in CDCl3 solution at 27 °C. Factors favouring the relatively rare ionic form of boron trifluoride adducts are discussed.
J. S. Hartman and P. Stilbs, J. Chem. Soc., Dalton Trans., 1980, 1142 DOI: 10.1039/DT9800001142
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