申请人:Ethyl Corporation
公开号:US04804772A1
公开(公告)日:1989-02-14
Quinones may be perfluoroalkylated by means of perfluoroalkyltrihydrocarbyl silane using certain active alkali metal salt catalysts devoid of fluorine (e.g., LiN.sub.3, NaN.sub.3, KN.sub.3, NaCN KCN, CsCN, NaOH, KOH, K.sub.2 CO.sub.3, and Cs.sub.2 CO.sub.3). The reaction--which is conducted under essentially anhydrous conditions, preferably in a suitable liquid phase reaction medium, most preferably a dipolar aprotic solvent--results in the formation of gem-disubstituted cyclohexadienones in which the gem substituents are a perfluoroalkyl group and a trihydrocarbylsiloxy group. These gem-disubstituted compounds in turn can be readily converted to perfluoroalkyl substituted aromatics, thus circumventing the traditional need for photochlorination followed by halogen exchange using hydrogen fluoride as a means of preparing perfluoroalkyl aromatic compounds.
奎诺恩可能通过使用某些不含氟的活性碱金属盐催化剂(例如LiN.sub.3,NaN.sub.3,KN.sub.3,NaCN KCN,CsCN,NaOH,KOH,K.sub.2CO.sub.3和Cs.sub.2CO.sub.3)由全氟烷基三氢碳基硅烷全氟烷基化。该反应在基本无水条件下进行,最好在适当的液相反应介质中进行,最好是二极无水溶剂,导致生成以全氟烷基和三氢碳基硅氧基为基团的双取代环己二烯酮。这些双取代化合物反过来可以轻松转化为全氟烷基取代芳香化合物,从而避免了传统上需要使用氢氟酸作为制备全氟烷基芳香化合物的手段的光氯化后的卤素交换。