CH171032A - Process for the preparation of a nuclear-substituted 1.4.5.8-naphthalenetetracarboxylic acid. - Google Patents

Process for the preparation of a nuclear-substituted 1.4.5.8-naphthalenetetracarboxylic acid.

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Publication number
CH171032A
CH171032A CH171032DA CH171032A CH 171032 A CH171032 A CH 171032A CH 171032D A CH171032D A CH 171032DA CH 171032 A CH171032 A CH 171032A
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CH
Switzerland
Prior art keywords
acid
preparation
substituted
nuclear
naphthalenetetracarboxylic acid
Prior art date
Application number
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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 CH171032A publication Critical patent/CH171032A/en

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Description

  

  Verfahren zur     Darstellung        einer        kernsubstituierten     1. 4. 6 .     8-Naphthalintetraearbonsäure.       Gegenstand vorliegenden Patentes ist ein  Verfahren zur Darstellung einer kerbsubsti  tuierten     1.4.5.8-Naphthalintetrakarbonsäure,     welches darin besteht,

   dass man     Acenaphthal-          säure    mit konzentrierter Salpetersäure in  Gegenwart von konzentrierter Schwefelsäure  behandelt und die so erhaltene     Dinitro-          1.4.5.8-naphthalintetrakarbonsäure    durch       Umkristallisieren    von der gleichzeitig ent  standenen     pinitroacenaphthalsäure    trennt.    <I>Beispiel:</I>  10 Gewichtsteile     Acenaphthalsäure    wer  den in 100 Raumteilen konzentrierter Schwe  felsäure gelöst und bei Temperaturen zwi  schen 15   und 20   mit 16 Raumteilen kon  zentrierter Salpetersäure (spezifisches Ge  wicht 1,52) versetzt.

   Das     Nitrierungsge-          misch    wird nach kurzer Zeit auf Eis  gegeben, das ausgeschiedene Produkt abge  saugt, neutral gewaschen und getrocknet.    Beim     Umkristallisieren,    z. B. aus Eisessig,  werden als     schwerlösliches    Produkt gelbliche  Prismen erhalten, die das     Anhydrid    der     Di-          ,nitroacenaphthalsäure    darstellen.

   Aus der       Eisessig-Mutterlauge    fällt Wasser eine Säure  aus, welche aus Chlorbenzol in fast farblosen  Prismen kristallisiert; es ist eine     Dinitro-          1    - 4. 5.     8-naphthalintetrakarbonsäure.    Sie soll  zur Darstellung von     Farbstoffen    Verwendung  finden.



  Process for the preparation of a nucleus-substituted 1. 4. 6. 8-naphthalenetetraearboxylic acid. The subject of the present patent is a process for the preparation of a notched 1.4.5.8-naphthalenetetracarboxylic acid, which consists in

   that acenaphthalic acid is treated with concentrated nitric acid in the presence of concentrated sulfuric acid and the resulting dinitro-1.4.5.8-naphthalenetetracarboxylic acid is separated by recrystallization from the pinitroacenaphthalic acid formed at the same time. <I> Example: </I> 10 parts by weight of acenaphthalic acid are dissolved in 100 parts by volume of concentrated sulfuric acid and 16 parts by volume of concentrated nitric acid (specific weight 1.52) are added at temperatures between 15 and 20.

   After a short time, the nitration mixture is poured onto ice, the precipitated product is filtered off with suction, washed neutral and dried. When recrystallizing, e.g. B. from glacial acetic acid, yellowish prisms are obtained as a sparingly soluble product, which represent the anhydride of di-, nitroacenaphthalic acid.

   From the glacial acetic acid mother liquor, water precipitates, an acid which crystallizes from chlorobenzene in almost colorless prisms; it is a dinitro 1-4.5.8-naphthalenetetracarboxylic acid. It should be used for the representation of dyes.

Claims (1)

PATENTANSPRU0H: Verfahren zur Darstellung einer kernsubsti tuierten 1.4.5.8-Naphthalintetracarbonsäure, dadurch gekennzeichnet, dass man Acenaph- thalsäure mit konzentrierter Salpetersäure -in Gegenwart von konzentrierter Schwefelsäure behandelt und die so erhaltenen Dinitro- 1.4.5.8-naphthalintetrakarbonsäure durch Umkristallisation von der gleichzeitig ent standenen Dinitroacenaphthalsäure trennt. PATENT APPLICATION: Process for the preparation of a nuclear-substituted 1.4.5.8-naphthalenetetracarboxylic acid, characterized in that acenaphthalic acid is treated with concentrated nitric acid in the presence of concentrated sulfuric acid and the dinitro 1.4.5.8-naphthalenetetracarboxylic acid obtained in this way is obtained by recrystallization from the simultaneously produced Dinitroacenaphthalic acid separates. Die so erhaltene Dinitro-1. 4 , 5 .8-naph- thalintetrakarbonsäure ist in Eisessig löslich und kristallisiert aus Chlorbenzol in fast farblosen Prismen. UNTERANSPRUCH Verfahren nach Patentanspruch; dadurch gekennzeichnet, dass die Nitrierung bei einer Temperatur zwischen<B>15'</B> und 20' bewirkt. wird. The dinitro-1 obtained in this way. 4, 5, 8-naphthalene tetracarboxylic acid is soluble in glacial acetic acid and crystallizes from chlorobenzene in almost colorless prisms. SUBClaimed method according to claim; characterized in that the nitriding is effected at a temperature between 15 'and 20'. becomes.
CH171032D 1932-03-02 1933-03-01 Process for the preparation of a nuclear-substituted 1.4.5.8-naphthalenetetracarboxylic acid. CH171032A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE171032X 1932-03-02

Publications (1)

Publication Number Publication Date
CH171032A true CH171032A (en) 1934-08-15

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ID=5689229

Family Applications (1)

Application Number Title Priority Date Filing Date
CH171032D CH171032A (en) 1932-03-02 1933-03-01 Process for the preparation of a nuclear-substituted 1.4.5.8-naphthalenetetracarboxylic acid.

Country Status (1)

Country Link
CH (1) CH171032A (en)

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