CH136551A - Process for the preparation of a descendant of the pyrazolanthrone. - Google Patents

Process for the preparation of a descendant of the pyrazolanthrone.

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Publication number
CH136551A
CH136551A CH136551DA CH136551A CH 136551 A CH136551 A CH 136551A CH 136551D A CH136551D A CH 136551DA CH 136551 A CH136551 A CH 136551A
Authority
CH
Switzerland
Prior art keywords
sep
acid
preparation
pyrazolanthrone
descendant
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 CH136551A publication Critical patent/CH136551A/en

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  • Medicinal Preparation (AREA)

Description

  

  Verfahren zur Darstellung eines     Abkömmlings    des     Pyrazolanthrons.       Gegenstand der vorliegenden Erfindung  ist ein     Verfahren    zur     D@arsteillung    von     Py-1-          ss-Naphtylpyraz@ol@a.nthron-o-carbonsäure    der  Formel  
EMI0001.0007     
    durch Kondensation von     Pvrazolanthron    mit       2-Chlor-3-naphtoesäure    in \     Gegenwart    eines  säurebindenden Mittels. Die. Reaktion kann  auch in     Gegenwart        einest    Katalysators aus  geführt werden.

   Das erhaltene Produkt wird  zur Darstellung von     Küpenfarbstoffen    ver  wendet.    <I>Beispiel:</I>  22 G. T.     Pyrazola,nthron,    22 G. T.     2-Chlor-          3-naphtoesäure.    15 G. T.     Kaliumacetat,    1 G. T.  Kupferacetat und 0,5 G. T. Kupferpulver  werden in     200    G. T.     A.mylalko        o1    unter Rüh  ren zum Sieden erhitzt, bis die Umsetzung  beendet ist.

   Durch     Wasserdampfdestillation     wird     der        Amylajlkohol    entfernt, der Rück  stand in verdünnter     Natriumcarbonatlösung     gelöst, von etwa ungelöst bleibenden Teilen       abfiltriert    und     das"    gelbe     Filtrat    mit ver  dünnter Mineralsäure gefällt. Die     Py-1-ss-          Naphty,Ipyrazoilaathro@n-o-e:arb-onsAure    fällt  als hellgelber     Niederschlag    aus und stellt       naeh    dem Trocknen ein hellgelbes     Puler    dar.

    Sie schmilzt nach dem     Umkristallisieren    aus  Eisessig bei 277 bis 279 'unter Aufschäumen.  Die     Lösungsfarbe    in     conc.    Schwefelsäure ist  orange.



  Process for the preparation of a descendant of the pyrazolanthrone. The present invention relates to a process for the division of py-1-ss-naphthylpyraz @ ol @ a.nthrone-o-carboxylic acid of the formula
EMI0001.0007
    by condensation of pvrazolanthrone with 2-chloro-3-naphthoic acid in the presence of an acid-binding agent. The. The reaction can also be carried out in the presence of a catalyst.

   The product obtained is used for the preparation of vat dyes. <I> Example: </I> 22 G. T. Pyrazola, nthron, 22 G. T. 2-chloro-3-naphthoic acid. 15 G. T. potassium acetate, 1 G. T. copper acetate and 0.5 G. T. copper powder are heated to boiling in 200 G. T. A. mylalko o1 with stirring until the reaction is complete.

   The amylajl alcohol is removed by steam distillation, the residue is dissolved in dilute sodium carbonate solution, any parts remaining undissolved are filtered off, and the yellow filtrate is precipitated with dilute mineral acid pale yellow precipitate and turns a pale yellow powder after drying.

    After recrystallization from glacial acetic acid, it melts at 277 to 279 'with foaming. The solution color in conc. Sulfuric acid is orange.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung von Py-1-ss- Naphtylpyrazola,nthron - o - aarbo@nsäure, da- EMI0002.0001 durch <SEP> gekennzeiehnet, <SEP> dass <SEP> man <SEP> P'yra.zol anthron <SEP> mit <SEP> 2-Chlor-3-naphtoesäure <SEP> bei <SEP> Ge genwart <SEP> eines <SEP> säurebindenden <SEP> Mittels <SEP> zur <tb> Umsetzung <SEP> bringt. <SEP> Die <SEP> Py-1-ss-NaphtyIpyr a7,olanthron-o-carbonsäure <SEP> ist <SEP> ein <SEP> hellgelbes <tb> Kristallpulver <SEP> vom <SEP> Schmelzpunkt <SEP> \?77 <SEP> bis <tb> 279 <SEP> , <SEP> ihre <SEP> Lösungsfarbe <SEP> in <SEP> canc. PATENT CLAIM: Process for the preparation of Py-1-ss- Naphtylpyrazola, nthron - o - aarbo @ näur EMI0002.0001 marked by <SEP>, <SEP> that <SEP> man <SEP> P'yra.zol anthron <SEP> with <SEP> 2-chloro-3-naphthoic acid <SEP> at <SEP> present <SEP> one <SEP> acid-binding <SEP> means <SEP> for <tb> Implementation <SEP> brings. <SEP> The <SEP> Py-1-ss-NaphtyIpyr a7, olanthron-o-carboxylic acid <SEP> is <SEP> a <SEP> light yellow <tb> crystal powder <SEP> from <SEP> melting point <SEP> \? 77 <SEP> to <tb> 279 <SEP>, <SEP> your <SEP> solution color <SEP> in <SEP> canc. <SEP> Schwefel- säure ist orauge, in verdünnten Alkalien oder Alkalik.arbonaten löst sie sich leieht mit gelber Farbe. <SEP> Sulfuric acid is orange, in dilute alkalis or alkali carbonates it dissolves slightly with a yellow color.
CH136551D 1926-10-22 1927-10-22 Process for the preparation of a descendant of the pyrazolanthrone. CH136551A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE136551X 1926-10-22
CH133473T 1927-10-22

Publications (1)

Publication Number Publication Date
CH136551A true CH136551A (en) 1929-11-15

Family

ID=25712076

Family Applications (1)

Application Number Title Priority Date Filing Date
CH136551D CH136551A (en) 1926-10-22 1927-10-22 Process for the preparation of a descendant of the pyrazolanthrone.

Country Status (1)

Country Link
CH (1) CH136551A (en)

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