ChemInform Abstract: Ozone Fading of 2,2′-Dihydro Azo Copper Complex Dyes.

Abstract

The reactivities of dyes with ozone were in the following order, Acid Blue 74>disodium 1-(2-hydroxyphenylazo)-2-naphthol-3,6-disulfonate>Direct Yellow 12>Acid Orange 7>disodium 1-phenylazonaphthalene-3,6-disulfonate-2,2′-diolatocopper(II)>Mordant Red 3>Basic Green 4. The reaction of disodium 1-phenyl-azonaphthalene-3,6-disulfonate-2,2′-diolatocopper(II) with ozone was retarded by the introduction of electron-withdrawing groups and 8-sulfonato group. The potassium sulfonate dye was less reactive than the sodium one. Ozonization of l-phenylazonaphthalene-2,2′-diolatocopper(II) gave phenol, 2-naphthol, and phthalic anhydride.