| 摘要 |
The invention comprises a substituted p-phenylene diamine of formula <FORM:1088306/C2/1> prepared by reducing 1-methoxy-2-nitro-4,6-dimethyl-benzene to 1-methoxy-2-amino-4,6-dimethylbenzene, nitrating this to introduce a nitro group into the 5-position after first protecting the 2-amino group, liberating the 2-amino group and reducing the 5-nitro group. A preferred method involves reducing and acetylating 1-methoxy-2-nitro-4,6-dimethyl benzene to produce 1-methoxy-2-acetamido-4,6-dimethyl benzene, then nitrating with nitric acid to give 1 - methoxy - 2 - acetamide - 5 - nitro-4, 6-dimethyl benzene, de-acetylating the product with HCl and reducing the 5-nitro group. The substance is utilizable in hair dyeing (see Division D1).ALSO:Keratinic fibres, particularly human hair, are dyed using a composition containing as essential component 1-methoxy-2,5-diamino-4,6-dimethyl benzene in the presence of an oxidising agent, e.g. H2O2. The composition may also contain other dyestuffs, thickening agents and/or surface active agent and preferably has a pH of 8-10. |
