| 摘要 |
NEW MATERIAL:A naphthalene derivative of the formula (wherein R is H, methyl or ethyl; and n is 1-3). USE:A vat dye for fibers, and a hair dye. the compound of the formula is not only excellent in storage stability but autoxidizes in a bath without the use of a special oxidizing agent and exhibits an excellent color development, enabling a fiber to be dyed in vivid reddish brown. The present compound also can dye a grizzled hair to such an extent that the grizzled hair is not realized. PREPARATION:The intended compound is prepared by reducing a 2-hydroxy(or alkoxy)alkylamino-2,3-dihydro-5,8-dihydroxynaphthoquinone in an aqueous hydrochloric acid solution in the presence of an alkali such as potassium hydroxide, water, an alcohol, etc., using a reducing agent such as sodium dithionate.
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