| 摘要 |
<p>A process is disclosed for the preparation of 2-hydroxy-benzanthrone and substituted derivatives thereof having the general formula: (I) wherein: R1 = H, OH R2, R3 = H, Cl, -OH, -OCH3, characterized in that an anthraquinone-1-diazonium salt is reacted with an olefinic compound of the formula: wherein X = CN or OCOCH3, in an alcoholic medium of a lower monovalent alcohol and in the presence of a catalytic quantity of cuprous chloride, at a temperature between 20.degree. and 100.degree.C, and that the reaction intermediate thus obtained is reacted successively with alkali in alcoholic solution. As the diazonium salt there is used an anthraquinone -1-diazonium sulphate prepared from : 1-amino-anthraquinone, 4-hydroxy-1-amino-anthra-quinone, 5-hydroxy-1-amino-anthraquinone, 5-methoxy-1-aminoanthra-quinone, 5-chloro-1-amino-anthraquinone, 6,7-dichloro-1-amino-anthraquinone, or 5-benzamido-1-aminoanthraquinone. Certain novel intermediates useful for the production of these 2-hydroxy-benzanthrone derivatives are disclosed, as well as certain novel dyes obtainable from the 2-hydroxybenzanthrone derivatives.</p> |
