SU382662A1 - METHOD FOR GETTING DYE-CUBESHOL - SALT - Google Patents

Description

one

The present invention relates to methods for producing dyes-cubozols, in particular, a new dye -cubozol, an alkali metal salt of the acid bicromide ester of the leuco-compound bromo-iodindigo, which can be used to dye cotton fabrics, natural and artificial silk and wool.

The proposed method is based on the well-known esterification reaction of the leuco compounds of the bottom dyes with the addition product of sulfuric anhydride to tertiary amines; it allows to obtain new dyes with a good yield and good color characteristics. In addition, the proposed dyes expand the color range of the cubozols.

The proposed method consists in the fact that bromine-iodoindigo is reacted with anhydrous acid pyridium sulfonic acid, followed by isolation of the target product by known methods.

Example. To 50 ml of pyridine at a temperature not exceeding 20 ° C, 6.2 ml of chlorosulfonic acid are added, the mass is stirred for 10-15 minutes and 10.8 g of bromiodoindigo with iodine content of 31% and 3.75 g is loaded into it.

powder lzeza. The reaction mass is stirred at 55-60 ° C until the end of the reaction, then poured into a soda solution and pyridine is distilled off. The product is extracted with an aqueous solution of soda, salted with sodium chloride. The dye is filtered, stabilized, dried and ground. The yield of cubozol is the disodium salt of the acid disulfate ester of the leuco-compound bromine-iodine indigo 12.3 g, which makes up 87% of the theoretical value. Iodine content found 23.61%; calculated 23.66%. Kubozol colors cotton fabric in blue.

Subject invention

The dye -Cabozol preparation method is an alkaline metal salt of an acid disulfate ester of a bromine-iodindigo acid compound, characterized in that, in order to expand the color range of cubozols, bromine-iodindigo is reacted with anhydrous-pyridine sulfonic acid followed by isolation of the target product product.