1,5‐Dihydroxy‐4,8‐diamino‐ and 1,8‐dihydroxy‐4,5‐diaminoanthraquinone‐β‐ethers and thioethers. Blue dyes for synthetic polymer fibres

Abstract

AbstractCondensation of mono‐ and di‐bromo‐derivatives of 1,5‐dihydroxy‐4,8‐diaminoanthraquinone and of 1,8‐dihydroxy‐4,5‐diaminoanthraquinone with phenols and thiols afforded the corresponding β‐ethers and thioethers. These compounds coloured polyester in bright reddish‐blue to greenish‐blue hues of generally good fastness to light and sublimation. The colour of the dyes is discussed with respect to the nature and orientation of the β‐substituent.