Gem-disubstituted cyclohexadienone in which the gem substituents are a perfluoroalkyl group and a trihydrocarbylsiloxy group are prepared by perfluoroalkylating a quinone with a perfluoroalkyltrihydrocarbylsilane in the presence of an active catalyst under essentially anhydrous conditions, preferably in a suitable liquid phase reaction medium, most preferably in a dipolar aprotic solvent. These gem-disubstituted compounds are readily convertible to perfluoroalkyl-substituted aromatics and thus provide a means of circumventing the traditional need for photo-chlorination followed by halogen exchange in the preparation of such products.
宝石二取代环
己二烯酮(其中宝石取代基为
全氟烷基和三氢羰基
硅氧烷基)的制备方法是:在活性催化剂存在下,在基本上无
水的条件下,最好是在合适的液相反应介质中,最理想的是在二极性无
水溶剂中,用
全氟烷基三氢羰基
硅烷对醌进行
全氟烷基化反应。这些 gem-二取代化合物很容易转化为
全氟烷基取代的
芳烃,因此提供了一种方法来避免在制备这类产品时需要先进行光
氯化再进行卤素交换的传统做法。