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Four new ʻupper rimʼ azocalix[4]resorcinarene have been synthesized by coupling calix[4]resorcinarene with different diazotized aromatic compounds of sulphanilic acid, anthranilic acid, o-aminophenol and p-aminobenzoic acid. The prepared compounds were characterized based on m.p., elemental analysis, FT-IR, 1H-NMR. These dyes have been used for the dyeing of textile fibres like cotton and wool. Their fastness properties such as fastness to sunlight, water, washings, and perspiration have also been studied. The synthesized dyes have been employed for computerized colour strength determination through colour matching with known standards. Their L, A*, B* values as well as the colour difference values such as ∆L, ∆A*, ∆B*, ∆C and ∆H have also been reported

Synthesis of Calix[4]resorcinarene Based Dyes and its Application in Dyeing of Fibres