| 摘要 |
A method is provided for reacting hexafluoropropylene oxide (HFPO) with a perfluoroacyl fluorides according to the formula X-Rf-COF (II) to selectively produce a monoaddition product according to the formula X-Rf-CF2-O-CF(CF3)COF (I), wherein selectivity for the monoaddition product over the biaddition product is 90% or greater or more typically 95% or greater. A continuous or repeated-batch process is provided comprising the steps of: a) providing a mixture of X-Rf-COF (II), a fluoride salt, and a polar solvent; b) adding hexafluoropropylene oxide (HFPO) in an amount such that X-Rf-COF remains in molar excess of HFPO by at least 10% and reacting X-Rf-COF with HFPO; c) separating unreacted X-Rf-COF from a mixture of addition products of hexafluoropropylene oxide (HFPO) and X-Rf-COF; and d) repeating step a) using unreacted X-Rf-COF separated in step c).
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