A dioxazine compound represented by the following formula (I) in the free acid form,
wherein R is hydrogen, halogeno, alkyl, alkoxy or sulfo, V is a direct linkage or
in which R₄ is hydrogen or alkyl, X is a direct linkage or an aliphatic, araliphatic or aromatic bridging group, B₁ and B₂ independently of one another are each phenylene or naphthylene, Y₁ and Y₂ independently of one another are each -CH=CH₂ or -CH₂CH₂Z in which Z is a group splittable by the action of an alkali, and R₁, R₂ and R₃ independently of one another are each hydrogen or alkyl, which is useful for dyeing or printing fiber materials such as cellulose fiber materials to give dyed or printed products of a deep blue color superior in fastness properties.
游离酸形式的下式(I)所代表的二噁嗪化合物、
其中 R 是氢、卤素、烷基、烷氧基或磺基,V 是直接连接,或
其中 R₄ 是氢或烷基,X 是直接连接基团或脂肪族、脂肪族或芳香族桥基,B₁ 和 B₂ 相互独立地各自是亚苯基或亚
萘基,Y₁ 和 Y₂ 相互独立地各自是-CH=CH₂ 或-CH₂CH₂Z,其中 Z 是可在碱作用下分裂的基团、R₁、R₂ 和 R₃ 相互独立地各自为氢或烷基,可用于
纤维素纤维材料等纤维材料的染色或印花,使染色或印花产品呈现牢度性能优越的深蓝色。