DE696426C - Process for the production of Kuepen dyes of the dibenzanthrone series - Google Patents

Description

Process for the production of vat dyes of the dibenzanthrone series Addition to patent 679 q82 Dias main patent 679 q.82 relates to a method of production new vat dyes of the dibenzanthrone series, which is based on the process of the patent 666 q.8o available from dioxydibenzanthrones and aromatic acid chlorides Compounds ammonia, phenylhydrazine or primary amines can act.

It has now been found that the same or similar Küpien dyes can be used obtained when the compounds with acid amides obtainable according to the patent 666 q.8o heated.

Both carboxamides and sulfonamides are suitable for the implementation, for example formamide, acetamide and higher fatty acid amides, benzamide, i-methylbenzeneq-sulfonic acid amide, also substitution products of these amides, e.g. B. i-methylbenzeneq-sulfonic acid methylamide. Example i A mixture of 3 parts of those described in Example i of '66648o patent Compound of dioxydibenzanthrone and benzoyl chloride, 1.5 parts of i-methylbenzene-q.-sulfonic acid a.mid and 3o parts of nitrobenzene are heated to boiling with stirring for 5 hours. One lets cool and suck off the precipitated dye. It dissolves in strong sulfuric acid with blue color and dyes cotton from a blue vat in strong burgundy tones.

Example 2 A mixture of 3 parts of the compound of dioxydibenzanthrone and z, q-dichlorobenzoyl chloride, 1.5 parts of i-methylbenzene-q-sulfonic acid amide and 3o parts of nitrobenzene is heated to the boil until the green-blue solution of the reaction mixture has turned red. The so preserved .., red tents 679482 and dyes cotton from a hot blue vat in strong, pure red tones of great authenticity.

Example 3 3 parts of the starting dye used in Example 2 are with 5 parts of benzamide and 3o parts of nitrobenzene in the example described Way heated. Of the . resulting dye agrees with that obtained according to Example 2 Dye match.

The same dye is also obtained if instead of benzamide Acetamide is used.

Example q.

A mixture of 3 parts of the starting dye used in Example 2, Parts of i-methylbenzene-q.-sulfonic acid methylamide and 3o parts of nitrobenzene are about Heated to the boil for 5 hours. The dye that separates out on cooling becomes sucked off. It dissolves in strong sulfuric acid with a blue color and falls in Dilute this solution with water to make red flakes. Cotton turns from blue The vat is colored in strong burgundy tones. Example 5 A mixture of 5 parts of the starting dye used in Example 2, 10 parts of formamide and 6o parts Nitrobenzene is heated to boiling for 1 hour while stirring. One lets cool sucks off the precipitated dye, washes it with methanol and dries it. It dissolves in strong sulfuric acid with blue fat and dyes cotton blue Vat in red tones.

Example 6 A mixture of 5 parts of the starting dye used in Example 2, - 10 parts of stearic acid amide and 6o parts of nitrobenzene is taken for about 4 hours Stirring heated to 80 to igo °. It is allowed to cool and the dye which has separated out is sucked off Wash it off with nitrobenzene, then with hot methanol and dry it. He dissolves in strong sulfuric acid with a blue color and dyes cotton blue Vat in red tones.

Claims (1)

PATEN TANSPRUCIi modification of the process for the production of vat dyes the dibenzanthrone series according to patent 679 482, characterized in that here Acid amides based on the process of patent 666 480 from dioxydibenzanthrones and aromatic acid chlorides available compounds.