申请人:AIR PRODUCTS AND CHEMICALS, INC.
公开号:EP1557404A1
公开(公告)日:2005-07-27
This invention relates to a process for the preparation of 1,1-difluoroolefins, e.g., difluorovinyl cycloaliphatic compounds such as difluorovinylcyclohexane and derivatives by the dehydrofluorination of a trifluoromethyl-substituted cycloaliphatic compound and the resulting compositions. This method utilizes a "sterically hindered super-base" system represented by the formula M+-NRR-; where M is Na or K and R is a secondary, or tertiary alkyl or cycloalkyl group of amines for effecting dehydrofluorination of the trifluoromethyl group leading to the difluorovinyl based cycloaliphatic compounds. The sterically hindered super base can be formed by the, in situ, reaction of a sodium or potassium alkoxide, e.g., KtBuO with a lithium dialkylamide where the lithium is bonded to nitrogen atom of an amine bearing secondary or tertiary aliphatic groups.
本发明涉及一种制备1,1-二氟烯烃的方法,例如通过三氟甲基取代的环脂化合物的脱氟氢化制备二氟乙烯基环脂化合物,例如二氟乙烯基环己烷和其衍生物,以及由此得到的组合物。该方法利用“空间位阻超碱”系统,其表示为M+-NRR-的公式;其中M为Na或K,R为二级或三级烷基或环烷基胺的烷基,用于实现三氟甲基基团的脱氟氢化,导致基于二氟乙烯基的环脂化合物。可以通过在场内反应钠或钾醇盐(例如KtBuO)与带有二级或三级脂肪族基的胺的氮原子键合的锂双烷基胺来形成空间位阻超碱。