SU16200A1 - Method for producing quinoid derivatives of 2: 1 naphtho-phenothiazine - Google Patents

Description

The proposed method for the preparation of quinoid derivatives of 2, 1-naphtofenothiazine oCHOBiaH on a reduced 2-ntfcfxn3, 2-ntrofeylnylmer capto-1, 4-naphtaquinone or its amide derivatives and A and sulfoneic acids and the subsequent isolation of the derivatives of 2, 1 nfto cf and A and sulphonoslot, and the subsequent separation of the 2, 1 -flutoph derivatives and Ai and sulphonoslot and the subsequent separation of the 2, 1-naphtophin derivatives and A and sulfone eslot and the subsequent separation of the 2, 1 derivatives, and 5-naphtaquinone;

When this occurs, the closure of the thiazine ring:.

HE

Looking at the material as it is taken up for reduction, the ring closure occurs already during the reduction process or during the subsequent acidification,

2-hydroxy-3, 21-nitrophenyl mercapto-1, 4 naphthoquinone can be obtained by decomposing 2-arylamino or 2-acedylamino-3 chloro-1, 4-naphtaquinone 2-nitrothiophene, and replacing the amino group with hydroxyl by boiling with alkalis. This compound is a brightly bright orange-red crystalline powder with a melting point of 245, dissolved in concentrated sulfuric acid and alkalis with an orange-yellow color. With excess sodium hydrate, sodium salt is obtained brilliantly copper-colored. By treating lightly smoked sulfuric acid in the cold, water-soluble orange-yellow sulphonic acid is obtained.

Example 33 parts of 2-hydroxy-3- (o-ntrophenylmercapto) -, 4-naphthoquinone are dissolved in the cold from 13 hours of sodium and sodium alkaline 40 ° B6 in 100 parts of water to the solution / about 7 parts of sodium hydrosulfite are added until bleaching . Let air through until

the solution will not turn dark cinnamon, and acidify. The liquid descends, especially when heated, into a purple-colored porridge mass consisting of a thiazine derivative. The latter is a crystalline violet powder, giving a solution of brown furlet color in concentrated sulfuric acid. In diluted paiCTBOpax caustic alkalis, it gives an unstable solution of green-blue color, - of

which is difficult to dissolve; alkaline salt of dark blue.

If we start from sulfonic acid 2 5xy-3. (o-nitrophenylmercapto) -1, 4-naphthoquinone, you get, using the same technique, thiazinsulfonic acid, dyeing the wool in a violet-red color, with subsequent chromium plating into a greener shade. Similar: results give the products of the replacement of the above starting material. Subject of the patent.

A process for preparing hynoidnyh proizvodn1h 2, 1-naftofenotiazina, otlichayschiys in that the 2-hydroxy-W, 2-nitrofenilmerkapto-1, 4-naphthoquinone or its amidoproizvdnye or rulfokisloty subjected to the action of reducing agents, after which the obtained derivative 2, 1-naftofenotiazina vgdel dissolved from the reaction mixture, the usual methods.