| 摘要 |
<p>1-amino-2-chloro- and 1-amino-2-bromo-4-hydroxy anthraquinones are prepd. by hydroxylating 1-amino-2:4-dichloro- or 1-amino-2:4-dibromo anthraquinone in H2SO4 in the presence of H3BO4 at 120-170 degrees C, the 2:4-dichloro-or 2:4-dibromo cpd. in the form of a filter cake moist with MeOH, EtOH, or PrOH and contg. at least 50% of the di-halo cpd., is introduced into 100-104.5% H2SO4 contg. 3.5-7% H3BO4, and heated to the reaction temp. i.e. 120-150 degrees C. Used as inters in the prepn. of disperse dyes. The alcohol-wet filter cake is used directly, thus obviating the washing and drying steps of known processes. A pure product is obtained.</p> |
