CH197476A - Process for the preparation of a polymethine dye. - Google Patents

Process for the preparation of a polymethine dye.

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Publication number
CH197476A
CH197476A CH197476DA CH197476A CH 197476 A CH197476 A CH 197476A CH 197476D A CH197476D A CH 197476DA CH 197476 A CH197476 A CH 197476A
Authority
CH
Switzerland
Prior art keywords
preparation
polymethine dye
dye
new
formyl
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 CH197476A publication Critical patent/CH197476A/en

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  • Indole Compounds (AREA)

Description

  

  Verfahren zur Herstellung eines     Polymethinfarbstof%s.       Im Hauptpatent ist ein Verfahren zur Her  stellung eines neuen     Polymethinfarbstoffes     beschrieben, bei dem man     N-Formyl-2,3-di-          hydro-a-methylindol    in Gegenwart eines chlor  haltigen Kondensationsmittels, wie     Phosphor-          oxychlorid    oder     Phosgen,    gegebenenfalls in  einem Lösungsmittel, mit     1,3,3-Trimethyl-2-          methylenindolin    in etwa molekularen Mengen  umsetzt.  



  Es wurde nun gefunden, dass man eben  falls einen neuen, wertvollen     Polymethinfarb-          atoff    erhält, wenn man unter den oben ge  schilderten Bedingungen     N-Formyl-1,2,3,4-          tetrahydrochinolin    mit     1,3,3-Trimethyl-2-me-          thylenindolin    umsetzt.  



  Der     Farbstoff    zeichnet sich durch hervor  ragende Klarheit und sehr gute Lichtechtheit  aus.  



  <I>Beispiel:</I>  Man versetzt eine Lösung von 35 Teilen       N-Formyl-1,2,3,4-tetrahydrochinolin    in 45 Tei  len Benzol unterhalb 10<B>0 0</B> mit 32 Teilen         Phosphoroxycblorid    und tropft bei 0-5   C  34 Teile     1,3,3-Trimethyl-2-methylenindolin     in diese Lösung. Beim Aufarbeiten in der im  Beispiel der Hauptanmeldung beschriebenen  Weise erhält man gelbe Kristalle, die auf       tannierter    Baumwolle klare, grüngelbe Fär  bungen liefern.



  Method of making a polymethine dye% s. The main patent describes a process for preparing a new polymethine dye, in which N-formyl-2,3-dihydro-a-methylindole is used in the presence of a chlorine-containing condensing agent such as phosphorus oxychloride or phosgene, optionally in a solvent with 1,3,3-trimethyl-2-methyleneindoline in approximately molecular amounts.



  It has now been found that a new, valuable polymethine dye is also obtained if N-formyl-1,2,3,4-tetrahydroquinoline is combined with 1,3,3-trimethyl-2- under the conditions described above. methylene indoline converts.



  The dye is characterized by excellent clarity and very good lightfastness.



  <I> Example: </I> A solution of 35 parts of N-formyl-1,2,3,4-tetrahydroquinoline in 45 parts of benzene below 10 0 0 is mixed with 32 parts of phosphorus oxychloride and 34 parts of 1,3,3-trimethyl-2-methyleneindoline are added dropwise to this solution at 0-5 C. When working up in the manner described in the example of the main application, yellow crystals are obtained which give clear, greenish-yellow colorations on tannic cotton.

Claims (1)

<B>PATENTANSPRUCH:</B> Verfahren zur Herstellung eines neuen Polymethinfarbstoffes, dadurch gekennzeich net, dass man N-Formyl-1,2,3,4-tetrahydro- chinolin in Gegenwart eines chlorhaltigen Kondensationsmittels mit 1,3,3-Trimethyl-2- methylenindolin in etwa molekularen Men gen umsetzt. Der neue Farbstoff färbt tannierte Baum wolle in klaren, grüngelben Tönen von guter Lichtechtheit. Claim: Process for the preparation of a new polymethine dye, characterized in that N-formyl-1,2,3,4-tetrahydroquinoline is mixed with 1,3,3-trimethyl in the presence of a chlorine-containing condensation agent -2- methylene indoline in approximately molecular quantities. The new dye dyes tannic cotton in clear, green-yellow tones with good lightfastness.
CH197476D 1935-08-16 1936-07-02 Process for the preparation of a polymethine dye. CH197476A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE197476X 1935-08-16
CH193624T 1936-07-02

Publications (1)

Publication Number Publication Date
CH197476A true CH197476A (en) 1938-04-30

Family

ID=25722550

Family Applications (1)

Application Number Title Priority Date Filing Date
CH197476D CH197476A (en) 1935-08-16 1936-07-02 Process for the preparation of a polymethine dye.

Country Status (1)

Country Link
CH (1) CH197476A (en)

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