A novel type of fiber reactive dye is described which eliminates chloride, alkoxide, or arylovide ions to produce a dyed fiber in which the amino groups of the fiber constitute a part of the chromophoric system. 3-Chloro-, 3-alkoxy-, and 3-aryloxy-Δ 1.α-indenemalononitriles and Δ1,2'-indene-1,3-indandiones had weak absorption maxima below 300 nm and dyed cellulose ester and polyester fabrics had pale yellow-orange shades. Dyeings on nylon 66 resulted in displacement of the 3-suhstituents by the amino groups of the fiber to give intense violet or blue dyeings. These compounds are members of a new class of fiber-reactive dyes.
