DE428185C - Process for the preparation of dyes of the dibenzanthrone series - Google Patents

Description

Process for the preparation of dyes of the dibenzanthrone series. In patent specification 267418, inter alia. Chick dyes described by introduction of acid residues in amino derivatives \ -on -dibenzanthrones are obtained. The dyes, which are produced by boiling the amino derivative with the acid chloride, draw As stated there, they are distinguished by their excellent fastness to chlorine.

It has now been found that quite bovine products are obtained if acidylating agents in the presence of diluents on aminoril> enzanthrone has an effect. So you get z. B. in this way from aminodibenzanthrone and benzoyl chloride a blue dye, while that of these substances according to patent specification 267418 generated dye turns violet-red. The new products have valuable coloring Properties, but they generally have contrary to those of the patent specification 267d.18 a chlorine fastness which is not on the level of that of the best vat dyes stands. The dyes can also be used as a starting material for the production of new dyes Find use.

Example r.

50 parts of pure ainodibenzanthrone, which z. B. from the patent 4o2641 available nitrodibenzanthrone can be made into a mixture of 50 parts of benzoyl chloride and zooo parts of nitrobenzene entered. The mixture is heated to boiling and stirred for 3 hours at boiling temperature. When cooling down the new dye separates as a dark colored powder, which z. B. in trichlorobenzene difficult to solve with blue color and red fluorescence. The solution color in concentrated sulfuric acid is reddish purple. The new dye stains from reddish blue vat cotton of the same color. In the case of oxidation the color changes to a strong blue in the air. The coloring will be when strong Chlorine gray.

If one uses instead of the benzoyl chloride o-Ch: lorbenzoylchlorid, in this way a similar dye with a slightly redder shade is obtained.

Aininoisodibenzanthrone goes into a nice one with the same treatment Purple over. Examples.

100 parts of pure aminodibenzanthrone are mixed with 2,000 parts of nitrobenzene and 100 parts of toluenesulfonyl chloride for 3 hours at 160 °. From your reaction mixture the new dye z. B. by steam distillation deposited. It forms a dark powder which turns reddish in concentrated sulfuric acid iolet, difficult to dissolve in warm trichlorobenzene with a blue color and red fluorescence. He dyes cotton blue-green from a reddish-tinged blue vat. With chlorination, the Coloring blue-gray.

Claims (1)

PATrN T-ANSPRUCTf Process for the representation of dyes of the dibenzanthrone series, characterized in that amine derivatives of dibenzanthrones are present in the presence treated by diluents with acidylating agents.