CH128368A - Process for the preparation of m-diazophenylsulfamic acid. - Google Patents

Process for the preparation of m-diazophenylsulfamic acid.

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Publication number
CH128368A
CH128368A CH128368DA CH128368A CH 128368 A CH128368 A CH 128368A CH 128368D A CH128368D A CH 128368DA CH 128368 A CH128368 A CH 128368A
Authority
CH
Switzerland
Prior art keywords
acid
diazophenylsulfamic
preparation
water
nitrophenylsulfamic
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellsc Farbenindustrie
Original Assignee
Ig Farbenindustrie Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ig Farbenindustrie Ag filed Critical Ig Farbenindustrie Ag
Publication of CH128368A publication Critical patent/CH128368A/en

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

  

  Verfahren zur Darstellung der     m-Diazophenylsulfaminsäure.       Gegenstand dieser Erfindung ist ein Ver  fahren zur Darstellung der     m-Diazophenyl-          sulfaminsäure,    welches dadurch gekennzeichnet  ist, dass man     m-Nitrophenylsulfaminsäure     reduziert und die so erhaltene     m-Aminophe-          nylsulfaminsäure,    mit der für die     Diazotierung     der     Aminogruppe    erforderlichen Menge sal  petriger Säure in der Kälte behandelt.  



       Beispiel:     21 Gewichtsteile     m-aminophenylsulfamin-          saures    Natrium welches durch     Reduktion    von       m-Nitrophenyls        ulfamin    säure hergestellt wurde,  werden in wenig Wasser gelöst, die Lösung  gerade kongosauer gestellt, 55     Volumteile     doppelt normaler Salzsäure zugegeben und  bei 0   mit einer konzentrierten Lösung von  7 Gewichtsteilen     Natriumnitrit    in Wasser       diazotiert.    Nach einiger Zeit scheidet sich  ein Teil der     Diazoverbindung    in kristalliner    Form ab.

   Die     Diazoverbindung    gibt durch  Kupplung mit alkalischem     P-Naphtol    einen  roten     wässerlöslichen        Farbstoff.  



  Process for the preparation of m-diazophenylsulfamic acid. This invention relates to a process for the preparation of m-diazophenylsulfamic acid, which is characterized in that m-nitrophenylsulfamic acid is reduced and the m-aminophenylsulfamic acid obtained in this way is in the amount required for diazotization of the amino group in saline acid treated the cold.



       Example: 21 parts by weight of sodium m-aminophenylsulfamic acid, which was prepared by reducing m-nitrophenylsulfamic acid, are dissolved in a little water, the solution is made acidic to the Congo, 55 parts by volume of double normal hydrochloric acid are added and a concentrated solution of 7 parts by weight is added at 0 Sodium nitrite diazotized in water. After some time, part of the diazo compound separates out in crystalline form.

   The diazo compound gives a red, water-soluble dye by coupling with alkaline p-naphthol.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung der m-Diazo- phenylsulfaminsäure, dadurch gekennzeichnet, dass man m-Nitrophenylsulfaminsäure redu ziert und die so erhaltene m-Aminophenyl- sulfaminsäure mit der zur Diazotierung der Aminogruppe erforderlichen Menge salpetriger Säure in der Kälte behandelt. Die Diazoverbindung bildet kleine Kriställ- chen, ist in Wasser leicht löslich und liefert mit ss-Naphtol einen roten wasserlöslichen Farbstoff. PATENT CLAIM: A process for the preparation of m-diazophenylsulfamic acid, characterized in that m-nitrophenylsulfamic acid is reduced and the m-aminophenylsulfamic acid thus obtained is treated in the cold with the amount of nitrous acid required to diazotize the amino group. The diazo compound forms small crystals, is easily soluble in water and, together with ss-naphtol, produces a red, water-soluble dye.
CH128368D 1926-04-15 1927-02-16 Process for the preparation of m-diazophenylsulfamic acid. CH128368A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE128368X 1926-04-15
CH126581T 1927-02-16

Publications (1)

Publication Number Publication Date
CH128368A true CH128368A (en) 1928-10-16

Family

ID=25710706

Family Applications (1)

Application Number Title Priority Date Filing Date
CH128368D CH128368A (en) 1926-04-15 1927-02-16 Process for the preparation of m-diazophenylsulfamic acid.

Country Status (1)

Country Link
CH (1) CH128368A (en)

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