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A non-etching preparation of potassium trifluoropropynyl- and fluoroaryltrifluoroborates from the corresponding organolithium and BF3-Et2O is described. The latter served as the fluoroboron source and a variety of aqueous saturated potassium salt solutions, other than KHF2, were examined for the Li-K exchange to generate the desired potassium organotrifluoroborates.
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