DE91391C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

from Ct ₁ α, -Dinitronaphtalin.

In Patent No. 90414 we have shown that O ₁ <x ₄ -Dinitronaphthalene is converted into a new body by the action of fuming sulfuric acid, which in dilute alkalis dissolves with a yellow color even in the cold. If one uses O ₁ a _g -dinitronaphthalene instead of α _χ a ₄ -Dinitronaphtalin, one arrives at similar results.

Example.

10 kg Ci ₁ a ₃ - Dinitronaphtalin are in 50 to 100 kg fuming sulfuric acid from 12 to 23 pCt. Entered content of free anhydride and stirred ^{at 40 to 50 0,}

until all the dinitronaphthalene in the new body, which is also in dilute alkalis with yellow color dissolves, is transformed. The sulfuric acid melt is poured into water, the precipitate is filtered, washed and dried.

The body crystallizes from glacial acetic acid in beautiful yellow crystals; in glacial acetic acid it is much more difficult to dissolve than the product of action obtained from the O ₁ a _i - dinitronaphthalene. It is also insoluble in water and sulfur-free. The following table summarizes the properties of the action products from the two isomeric dinitronaphtalines:

on
K ₁ K ₄ -Dinitronaphthalene on
Ct ₁ Ct ₃ - Dinitronaphthalene Exposure to 45 pCt. fuming sulfuric acid
and sulfur at 150 to 160 ° C. Water soluble brown
yellow wool dye Water soluble
bordeaux-dyed wool
dye Successive exposure to fuming sulfur
acid (and sulfur) 6o ° B. Zf ₂ S0 _A Brown wool dye F. Red violet wool
dye Treat with 6o ° B. H ₂ SO ₄ in the presence of
Boric acid Bordeaux-red wool
color peat Brown purple wool
dye Heating with Na OH of 30 ⁰ B. Brown wool dye Yellow-gray wool dye F.

on
«Yes ₄ -Dinitronaphthalene on ■
«I a ₃ - Dinitronaphthalene Nitriding with nitric sulfuric acid Yellow nitro dye
(probably a tri-
nitronaphtol) Yellow nitro dye Heating with Na% S + S (according to the method of
Patent No. 91508) Black substantive
Cotton dye Black cotton
dye Reduction using sulfur ammonium Immediately crystallized beautifully
Base (probably a
Diamidonaphtol) None that can be directly isolated
Products available at
Adherence to the same
Test conditions.

A reaction which allows the two bodies to be recognized with ease is as follows: each of them is dissolved in dilute caustic soda and a little zinc dust is added; with the product of action of Ct ₁ a ₃ - dinitronaphthalene a beautiful green solution is obtained, with the product of action of O ₁ a _t - dinitronaphthalene a beautiful red solution.

Claims (1)

Patent claim: Process for the preparation of a body of Ct ₁ a _s - dinitronaphthalene which is soluble in alkalis with a yellow color, consisting in that the isomer CL ₁ a ₃ - dinitronaphthalene is used here _{instead of the Ct 1} ct _{4 dinitronaphthalene which is reacted in the main patent} .