| 摘要 |
A process for preparing a colorant of the formula which comprises preparing a first reaction mixture by admixing leucoquinizarin and, optionally, quinizarin, an aminobenzene substituted with an alcohol group of the formula -R1-OH, boric acid, and an optional solvent, and heating the first reaction mixture to prepare an alcohol-substituted colorant of the formula followed by converting the colorant thus prepared to either an ester-substituted colorant by reaction with an esterification compound which is either an anhydride of the formula or an acid of the formula R2COOH in the presence of an optional esterification catalyst, or a urethane-substituted colorant by reaction with an isocyanate compound of the formula <?in-line-formulae description="In-line Formulae" end="lead"?>R4-N-C-C-O,<?in-line-formulae description="In-line Formulae" end="tail"?> and brominating the colorant thus prepared, wherein either conversion to ester or urethane can be performed before bromination or bromination can be performed before conversion to ester or urethane.
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