SU17539A1 - Modifying the method of producing nitro dyes - Google Patents

Description

Patent No. 16793 describes a method for producing semi-dyeing crystals, which involves the action of aromatic nitro compounds, with the exception of .1-halo2-4 dinitrobenzene, for 4 diphenylamine, its derivatives and substitution products.

In the proposed modification of the above method, consisting in applying for the condensation of two molecules any 4-amino-Diphenylamine sulfo and C-card or any of their derivatives with one molecule of any 1: 3-: digo-4: 6-dinitrobenzene, or some derived from the latter, more or less water-soluble dyes are obtained, dyeing the windows of animal origin in colors from yellow-green to red-brown shades, resistant to valine and light.

Condensation occurs with the release of both halogen atoms. It proceeds in good yield when conducting the reaction in an aqueous pacTBtope at boiling point with the addition of acid-binding agents. The operation can be accelerated with the assistance of catalysts (for example, copper compounds) or small amounts of organic solvents, for example, alcohol; in most cases, the application of pressure is not necessary.

Example 1. A suspension of 23.4 parts by weight of 1-3-dichloro 4: 6-dinitrobenzene was prepared in a 15-fold amount of water, to which a little alcohol was added. Then gradually over 15 hours, this suspension is added to an alkaline solution prepared from 61.8 parts by weight of 4-nitro-4-aminodiphenylamine-2-sulfonic acid, 400 parts of water and 24 weight parts of soda ash, and the liquid becomes brown in color. After boiling for another few hours,--filtered in a darker state than dark brown i liquid and from the filtrate

ZO N

NHNO.NO, NH

  /.

May

Example 2 When replaced in the example, a dye dye staining with 4-nitro-4-aminodiphenylamine-2-wolf fibers in brown-yellow color is radiated,

-sulfonic acid, 52.8 w / h and 1 st mi, resistant to the action of fork and light. 4-aminodiphenylamine-2-sulfonic acid. The formula for its structure is as follows:

 // / 5O H1 H Example 3i. If the reaction is carried out as in Example 1, replacing 4-nitro-4-aminodiphenylamine-21 sulfonic acid used there with 56 parts by weight of 4-methyl-4NHNO.

/ / / .1 I

en sOsHNH

An example. 25.1 parts by weight of 2 - 6 - dichloro - 3-5-dinitrotoluene are mixed with 500 parts of water in which 30 wt. parts of soda ash, and 52.8 parts by weight of 4-aminodiphenylamine-2-sulfonic acid. According to J weight. including copper sulfate.

NH

 .

CALL

dye salt is isolated with potassium chloride or sodium. The latter dyes the wool in a weakly acidic bath in a very intense yellow, with a greenish tint, color stable to the shaft and the action of light. Dye should be attributed to the following structure:

5Russ

NO NH

.

NO9NH

NO-

 /

 , /

NH

SO;, H

NH

NO,

.

SOaHCHs

NH

boil for 20 hours; then the resulting dark reddish-brown liquid is filtered and the dye is salted out. It dyes wool brown, resistant to billow and light; The formula for building it is:

 NH

NO, NO.

  / /

  /

/ H /: h /

NH 1 NHSOsH

cn, i aminodiphenylamine-2-sulphoxyls, it is possible to obtain a dye, dyeing {wool in bright orange-yellowish tones. The dye corresponds to the formula: Subject patent. A modification of the process for preparing iytrokrasiteley, oznachennogo Patent L 16793 characterized in that two molecules kakoOlibo 4-aminodifenilak (shsulfokisloty or any of their proizj water are condensed with one molecule j kakogoglibo 1, 3-dihalo-4 b-dinitro | benzene or any derivative of the latter.