1 : 4-Diamino-2-aryloxy-3-sulphoanthraquinones are prepared by heating 1 : 4-diamino-2 : 3-dichloranthraquinones under atmospheric pressure with a phenol and a sulphite of a strong, preferably inorganic, base in the presence of water. In examples 1 : 4-diamino-2 : 3-dichloranthraquinone is boiled with phenol and aqueous sodium sulphite to give 1 : 4-diamino-2-phenoxy-3-sulphoanthraquinone; this product is saponified to the corresponding 2-oxy derivative by warming with dilute soda and it dyes wool from a faintly acid bath in blue-violet shades. The sodium sulphite may be replaced by the methylamine salt of sulphurous acid, and homologues and substitution products of phenol may replace the latter; thus when m-cresol is used 1 : 4-diamino-2-cresoxy-3-sulphoanthraquinone which dyes wool violet-blue shades is obtained. The dyestuffs produced from halogenphenols also yield violet dyeings on wool.
通过在
水的存在下,在强的、最好是无机的碱的
酚和
亚硫酸盐的作用下,加热1:4-二
氨基-2:3-二
氯蒽醌,制备1:4-二
氨基-2-芳氧基-3-
磺酸蒽醌。在实例中,将1:4-二
氨基-2:3-二
氯蒽醌与
酚和
水合硫酸钠水溶液沸腾,得到1:4-二
氨基-2-苯氧基-3-
磺酸蒽醌;该产物通过加热稀苏打
水溶液进行皂化反应,得到相应的2-羟基衍
生物,该产物能够在微酸性的
染料浴中用于给羊毛染上蓝紫色的色调。
亚硫酸盐可以被亚
磺酸甲胺盐所取代,
酚的同系物和取代产物也可以取代后者;因此,当使用m-甲
酚时,可以得到1:4-二
氨基-2-甲基苯氧基-3-
磺酸蒽醌,该产物可以使羊毛染成紫蓝色的色调。来自卤代
酚的
染料也可以在羊毛上产生紫色
染料。