申请人:Eastman Kodak Company
公开号:US05214186A1
公开(公告)日:1993-05-25
A process for the preparation of arylidene dyes comprises the reaction of an aromatic amine with an enolate salt of a formylated active methylene compound in the presence of a sulfonyl halide compound. An enol sulfonate is postulated as a reactive intermediate in the reaction. The process gives high yields of products under mild reaction conditions and allows the use of aromatic groups containing substituents such as hydroxy that lead to side reactions and low product yields with previously known methods for making arylidene dyes.
一种制备芳基亚亚甲基染料的方法包括在芳香胺与一种酮醇盐反应的同时,在存在磺酰卤化合物的情况下,与一种甲基活性甲基化合物反应。该反应中假设存在烯醇磺酸酯作为一个活性中间体。该方法在温和的反应条件下产率高,允许使用含有亲水基团等取代基的芳香基团,这些取代基在以往已知的制备芳基亚亚甲基染料的方法中会导致副反应和产率低。