申请人:3M Innovative Properties Company
公开号:US20040116742A1
公开(公告)日:2004-06-17
A method is provided for reacting hexafluoropropylene oxide (HFPO) with a perfluoroacyl fluorides according to the formula X—R
f
—COF (II) to selectively produce a monoaddition product according to the formula X—R
f
—CF
2
—O—CF(CF
3
)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—R
f
—COF (II), a fluoride salt, and a polar solvent; b) adding hexafluoropropylene oxide (HFPO) in an amount such that X—R
f
—COF remains in molar excess of HFPO by at least 10% and reacting X—R
f
—COF with HFPO; c) separating unreacted X—R
f
—COF from a mixture of addition products of hexafluoropropylene oxide (HFPO) and X—R
f
—COF; and d) repeating step a) using unreacted X—R
f
—COF separated in step c).
本方法提供了一种将六氟丙烯氧(HFPO)与化学式为X-Rf-COF(II)的全氟酰氟反应,以选择性地产生一种单加成产物,其化学式为X-Rf-CF2-O-CF(CF3)COF(I),其中单加成产物的选择性大于或等于90%或更通常为95%以上,而非双加成产物。提供了一种连续或重复批处理过程,包括以下步骤:a)提供X-Rf-COF(II)、氟化物盐和极性溶剂的混合物;b)加入六氟丙烯氧(HFPO),使X-Rf-COF剩余量至少比HFPO多10%的量,并将X-Rf-COF与HFPO反应;c)从六氟丙烯氧(HFPO)和X-Rf-COF加成产物的混合物中分离未反应的X-Rf-COF;d)使用在步骤c)中分离出的未反应的X-Rf-COF重复步骤a)。