DE388815C - Process for the production of Kuepen dyes of the anthraquinone series - Google Patents

Description

Process for the production of vat dyes of the anthraquinone series. In the patent 374836 a process for the preparation of vat dyes was disclosed Anthraquinone series described, characterized in that such i - 2-naphthoquinone derivatives, which contain reactive radicals in their 3- or 4-position, u-amino or. a, a-Diaminoanthraquinones can act and that the reaction products thus obtained condensed with o-diaminoanthraquinones.

It has now been found that vat dyes of the same genus as they are obtainable according to the information in the main patent, if one those i - 2-naphthoquinone derivatives which contain reactive substituents, first with i 12o1. condensed of an o-diaminoanthraquinone and then to the thus obtained product a-amino or. a, x-diaminoanthraquinone can act. example i.

18 parts of 6-bromo-1- 2-naphthoquinone and 15 parts of 2 # 3-diaminoanthraquinone glacial acetic acid is added in i8o parts, then slowly increased with constant stirring go heated to 100 °. Stirring is continued at this temperature until the reaction has taken place then let it cool down, filter it, wash the residue abundantly with hot water and dries. The product obtained in this way forms a green-yellow powder that dissolves with dissolves blue-violet color in concentrated sulfuric acid.

g parts of this product are now together with 6 parts of a-aminoanthraquinone, 6 parts of dehydrated sodium acetate, 1/2 part of dehydrated cupric chloride and 3oo Share nitrobenzene refluxed for 16 hours. After it has cooled down suctioned off, the residue successively with alcohol, dilute hydrochloric acid and hot Water washed and dried.

The dye thus obtained is a brown-red powder that is very difficult to dissolve with red color in nitrobenzene. It dissolves in more focused Sulfuric acid with a yellow-brown color, red flakes precipitate when water is added. With hydrosulfite and caustic soda a brown vat is obtained, from which cotton is strongly red-brown and extremely real colored.

The replacement in this example of the a-aminoanthraquinone by the x - 5-diaminoanthraquinone results in a slightly bluer product while using from i - 2-diaminoanthraquinone instead of 2 - 3-diaminoanthraquinone to a brownish one blue red leads. Example 2.

18 parts of 3-bromo-1-naphthoquinone and 15 parts of 9-3 -diaminoanthraquinone are introduced in 180 parts of glacial acetic acid, then slowly heated to 100 ° with constant stirring. Stirring is continued at this temperature until the reaction has taken place, then allowed to cool, filtered, abundantly washed the residue with hot water and dried. The product obtained in this way forms a green-yellow powder that dissolves in concentrated sulfuric acid with a red color.

g parts of this product are now together with 6 parts of a-aminoanthraquinone, 6 parts of dehydrated sodium acetate, 1/2 part of dehydrated cupric chloride and 3oo Share nitrobenzene refluxed for 16 hours. After it has cooled down suctioned off, the residue successively with alcohol, dilute hydrochloric acid and hot Water washed and dried.

The dye thus obtained is a blue-red powder. It dissolves in concentrated sulfuric acid with a red-brown color, upon addition of water red-sticky black flakes fall out. With hydrosulfite and caustic soda, a Red-brown vat preserved, from which cotton violet-tinged brown and extremely fine is genuinely colored.

The replacement in this example of the a.-aminoanthraquinone by the i # 5-Diaminoanthraquinone results in a similar product.

Claims (1)

PATENT CLAIM: Process for the production of vat dyes Anthraquinone series according to patent 374836, characterized in that such i # 2-naphthoquinone derivatives containing reactive substituents first condensed with x moles of an o-diaminoanthraquinone and then onto the resultant Product u-amino or. a, a-Diaminoanthraquinone can act.