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An improved synthesis of potassium (trifluoromethyl)trifluoroborate [K(CF 3 BF 3 )] has been developed. Thus Ruppert's reagent, (trifluoromethyl)trimethylsilane, is treated with trimethoxyborane in the presence of potassium fluoride. Aqueous hydrogen fluoride is added to the resulting intermediate, and the title compound can be isolated in 85% overall yield. The process is readily scalable, allowing a viable procedure for the synthesis of this potentially valuable reagent.
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Molander et al. (2003) studied this question.
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