CH124079A - Process for the preparation of an organic rhodane compound. - Google Patents

Process for the preparation of an organic rhodane compound.

Info

Publication number
CH124079A
CH124079A CH124079DA CH124079A CH 124079 A CH124079 A CH 124079A CH 124079D A CH124079D A CH 124079DA CH 124079 A CH124079 A CH 124079A
Authority
CH
Switzerland
Prior art keywords
organic
preparation
rhodane
compound
naphtol
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 CH124079A publication Critical patent/CH124079A/en

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  • Thiazole And Isothizaole Compounds (AREA)

Description

  

  Verfahren zur Darstellung einer organischen     Rthodanveibindung.       Im Hauptpatent ist ein Verfahren zur  Einführung von     Rhodangruppen    in organische  Verbindungen beschrieben, nach welchem man  auf die zu     rhodanierende    organische Verbin  dung ein anorganisches     Rhodanid    in gelöster  Form und gleichzeitig ein Halogen zur Ein  wirkung bringt.  



  Gegenstand des vorliegenden Patentes ist  ein Verfahren zur Herstellung von 2 . 4     -          Dirhodan-l-naphtol    der Formel  
EMI0001.0007     
    welches dadurch gekennzeichnet ist, dass man  ein anorganisches     Rhodanid    in gelöster Form  und gleichzeitig ein Halogen auf     a-Naphtol     einwirken lässt.  



  Das 2.     4-Dirhodan-l-naphtol    wird in Form  von gelben Nadeln erhalten, die bei 118 bis  <B>119'</B> unter Zersetzung schmelzen. Es soll  als Zwischenprodukt zur Herstellung von         Farbstoffen    und pharmazeutischen Produkte       Verwendung    finden.  



  <I>Beispiel:</I>  10 Teile     a-Naphtol    werden in 120 Teilen       Essigsäure        (96%)        und        80        Teile        Rhodan-          kalium    in 350 Teilen Essigsäure gelöst, und  zur Mischung beider Lösungen werden 10  Teile Brom, gelöst in 120 Teilen Essigsäure  langsam     zugetropft.    Der nach kurzer Zeit  ausfallende Kristallbrei wird filtriert und ge  waschen. Der Rückstand wird in Alkohol  gelöst und die alkoholische Lösung durch  Zusatz von Wasser gefällt. Auf diese Weise  erhält man das bisher noch nicht beschrie  bene     2.4-Dirhodan-l-naphtol.  



  Process for the preparation of an organic rthodane bond. The main patent describes a process for introducing rhodan groups into organic compounds, according to which an inorganic rhodanide in dissolved form and at the same time a halogen are brought into effect on the organic compound to be rhodanized.



  The present patent relates to a process for the production of 2. 4 - Dirhodan-l-naphtol of the formula
EMI0001.0007
    which is characterized in that an inorganic rhodanide in dissolved form and at the same time a halogen are allowed to act on a-naphthol.



  The 2,4-dirhodane-1-naphtol is obtained in the form of yellow needles which melt at 118 to 119 'with decomposition. It is said to be used as an intermediate in the manufacture of dyes and pharmaceutical products.



  <I> Example: </I> 10 parts of a-naphtol are dissolved in 120 parts of acetic acid (96%) and 80 parts of rhodium potassium in 350 parts of acetic acid, and 10 parts of bromine are dissolved in 120 parts of acetic acid to mix the two solutions slowly added dropwise. The crystal pulp which precipitates out after a short time is filtered and washed. The residue is dissolved in alcohol and the alcoholic solution is precipitated by adding water. In this way, 2.4-dirhodan-1-naphtol, which has not yet been described, is obtained.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung des 2 . 4 - Dirhodan-l-naphtols, dadurch gekennzeichnet, dass man ein anorganisches Rhodanid in ge löster Form und gleichzeitig ein Halogen auf a-Naphtol zur Einwirkung bringt. Das 2 . 4-Dirhodan -1- naphtol wird in Form von gelben Nadeln erhalten, die bei 118-119o unter Zersetzung schmelzen. tTNTERANSPRüCFIP 1. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass die Reaktion in einem sauren Medium durchgeführt wird. PATENT CLAIM: Method for displaying the 2nd 4 - Dirhodan-1-naphtols, characterized in that an inorganic rhodanide in dissolved form and at the same time a halogen on a-naphtol are brought into action. The 2nd 4-Dirhodan -1-naphtol is obtained in the form of yellow needles which melt at 118-119o with decomposition. tTNTERANSPRüCFIP 1. The method according to claim, characterized in that the reaction is carried out in an acidic medium. Verfahren nach Patentanspruch, dadurch gekennzeichnet, dass die Reaktion in essig saurer Lüsung durchgeführt wird. Process according to patent claim, characterized in that the reaction is carried out in an acidic solution.
CH124079D 1925-08-27 1926-08-13 Process for the preparation of an organic rhodane compound. CH124079A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE124079X 1925-08-27
CH122990T 1926-08-13

Publications (1)

Publication Number Publication Date
CH124079A true CH124079A (en) 1928-01-02

Family

ID=25709978

Family Applications (1)

Application Number Title Priority Date Filing Date
CH124079D CH124079A (en) 1925-08-27 1926-08-13 Process for the preparation of an organic rhodane compound.

Country Status (1)

Country Link
CH (1) CH124079A (en)

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