Eco-Friendly Synthesis of 4-4-diaminodiphenylurea, a Dye Intermediate and Direct Dyes Derived from it

Abstract

A rapid, environmental friendly and highly efficient method for the synthesis of 4-4'-diaminodiphenylurea and direct dyes derived form it has been reported. The reported method is environmentally friendly, as it doesn’t involve the usage of environmentally hazardous material like phosgene and triphosgene. Novel azo dyes have been prepared by the coupling of 4-4'-Diaminodiphenylurea with various couplers. Structure elucidation of the synthesized dyes was carried out by IR, NMR, Elemental analysis, and confirmation was made by Mass Spectrometery. The dyeing performance of these dyes was assessed on cotton fabric. The dye bath exhaustion, sublimation and fastness properties were also determined. The dyed fabric showed moderate to good light fastness and very good to excellent fastness properties for washing, rubbing, perspiration, and sublimation.