beta,beta'-Thiodipropionitrile → 3-cinnamoylamino-4-(2'-cyano-4',6'-dinitrophenylazo)-N,N-diethylaniline

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Into a solution composed of 6.8 parts of cuprous bromide in 300 parts by volume of bis(β-cyanoethyl) sulfide, there are introduced 26 parts of 3-cinnamoylamino-4-(2'-bromo-4',6'-dinitrophenylazo)-N,N-diethylaniline. The mixture is heated to 100° C. and, during several minutes, a solution of 2.6 parts of sodium cyanide in 16 parts of water is allowed to flow in. Stirring is continued for 1 to 2 hours more, at 115° C. After cooling to 30° C., the 3-cinnamoylamino-4-(2'-cyano-4',6'-dinitrophenylazo)-N,N-diethylaniline formed is separated, under the same conditions as in example 1. The yield is 85.5%.

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