申请人:Eastman Kodak Company
公开号:US04642359A1
公开(公告)日:1987-02-10
A process for selectively preparing isomers of polysubstituted pyrylium salts from isoolefins or isoolefin precursors comprises diacylating the isoolefin or isoolefin precursor with a carboxylic acid anhydride in the presence of an acid having a Hammett acidity function, at about 22.degree.-25.degree. C. when pure, between -10 and -5. This method is selective to obtain the most substituted isomer of pyrylium salt that can be obtained from the isoolefin or isoolefin precursor.
从异构烯或异构烯前体中选择性制备多取代吡啶锭的过程包括在存在具有Hammett酸度功能的酸的情况下,使用羧酸酐对异构烯或异构烯前体进行二酰基化,在纯度为约22℃至25℃时,酸度函数在-10至-5之间。该方法是选择性的,可获得从异构烯或异构烯前体中获得的最多取代的吡啶锭异构体。