Abstract
A convenient new preparative method for the unknown class of perfluoroalkyltrifluoroborates K[CnF2n+1BF3] and perfluoroalkyldifluoroboranes CnF2n+1BF2 (n > 1) is elaborated. The perfluoroalkyl group is introduced into the boric acid ester by using CnF2n+1MgBr. Treatment with K[HF2] and HFaq results in K[CnF2n+1BF3] which can be defluoridated by AsF5 to the corresponding boranes CnF2n+1BF2.
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