Abrégé

The present invention discloses a method for preparing disperse blue 360. 2-Bromothiazole is used as a raw material and is subjected to four unit reaction processes of nitration, hydrazination, amination and oxidation to obtain the target product. Its specific route is as follows: 2-bromothiazole is used as a raw material and subjected to a nitration reaction under the action of a mixture of concentrated nitric acid and concentrated sulphuric acid using to produce 2-bromo-5-nitrothiazole, the resulting 2-bromo-5-nitrothiazole is reacted using 2-methyltetrahydrofuran as a solvent under the action of hydrazine hydrate to produce 2-hydrazino-5-nitrothiazole, the resulting 2-hydrazino-5-nitrothiazole is reacted with 3-methyl-4-chloro-N,N-diethylaniline under the action of triethylamine, cuprous bromide and butanol to produce 2-[[4-(diethylamino)-2-methylphenyl]diamine]-5-nitrothiazole, the prepared 2-[[4-(diethylamino)-2-methylphenyl]diamine]-5-nitrothiazole is reacted under the action of an oxidant to produce the target product. In the present invention, sodium perborate and a composite catalyst are used for the hydrazine oxidation, which solves the problem of a low conversion rate of hydrazine oxidation using hydrogen peroxide as an oxidant, and provides a new preparation method for synthesizing the azo dye.

Classes IPC  ?

• C09B 29/09 - Aminobenzènes copulés avec des amines diazotées contenant des hétérocycles
• C07C 245/04 - Composés azo, c.-à-d. composés ayant les valences libres de groupes —N=N— attachées à des atomes différents, p. ex. diazohydroxydes avec des atomes d'azote de groupes azo liés à des atomes de carbone acycliques ou à des atomes de carbone de cycles autres que des cycles aromatiques à six chaînons