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.
制备芳基
染料的工艺包括芳香胺与甲酰化活性亚甲基化合物的烯醇盐在磺
酰卤化合物存在下的反应。烯醇
磺酸盐被认为是反应中的活性中间体。该工艺在温和的反应条件下可得到高产率的产品,并可使用含有羟基等取代基的芳香族基团,而这些取代基在以前已知的芳基
染料制造方法中会导致副反应和低产品产率。