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CN1854201B 热敏染料的制备方法 失效 - 权利终止

热敏染料的制备方法
摘要：
本发明公开了一种热敏染料3-二丁基-氨基-6-甲基-7-苯胺荧烷的制备方法，该热敏染料由如下化学式(IV)表示，该制备方法包括：反应物(I)N-甲酰基-4-甲氧基-2-甲基二苯胺与反应物(II)2-(4-二丁基氨基-2-羟基苯甲酰基)苯甲酸在浓硫酸存在下进行反应，反应物(I)与反应物(II)的摩尔比为0.8～1.2，整个过程温度保持在15～25℃之间，并保温4～48小时，得到由化学式(III)表示的化合物，然后导入冷水对该化合物(III)进行固化，过滤；在有机溶剂的存在下，向固化的化合物(III)加入碱和水，用碱中和到pH≥11，对其进行回流、降温、过滤、洗涤而得到由化学式(IV)表示的化合物。制备方法如下：
摘要（英）：

The invention discloses a method for preparing a thermo-sensitive dye 3-dibutyl-amino-6-methyl-7-aniline fluorane which is represented by the chemical formula (IV) and is carried out by reacting N-formoxyl-4-methoxyl-2-methyldiphenylamine (I) with 2-(4-dibutyl amino-2-hydroxyl benzoyl)benzoic acid (II) in the presence of concentrated sulfuric with a mol ratio of 0.8-1.2, keeping temperature at 15-25 DEG C for 4-48h, obtaining a compound represented by chemical formula (III), inducing cool water for curing and filtering the compound (III), adding base and water into the cured compound (III) in the presence of organic solvent, neutralizing to pH>=11 by base, refluxing, cooling, filtering and washing to obtain a final product represented by the chemical formula (IV). The preparation method is as follow.

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