CH212640A - Process for the preparation of a new sulfonic acid. - Google Patents
Process for the preparation of a new sulfonic acid.Info
- Publication number
- CH212640A CH212640A CH212640DA CH212640A CH 212640 A CH212640 A CH 212640A CH 212640D A CH212640D A CH 212640DA CH 212640 A CH212640 A CH 212640A
- Authority
- CH
- Switzerland
- Prior art keywords
- sulfonic acid
- preparation
- agent
- new sulfonic
- acid
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
- C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
- C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
- C07D235/06—Benzimidazoles; Hydrogenated benzimidazoles with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 2
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Herstellung einer neuen Sulfonsäure. Es wurde gefunden, dass man zu einer neuen Sulfonsäure gelangt, wenn man a Undecyl-benzimidazol mit Isopropylalkohol in Gegenwart eines wasserabspaltenden Mittels kondensiert und das erhaltene Kondensations produkt mit einem sulfonierend wirkenden Mittel behandelt.
Als wasserabspaltendes Mittel eignet sich im vorliegenden Fall insbesondere Schwefel- säuremonobydrat.
Die neue Sulfonsäure bildet in Form ihres Natriumsalzes ein hellgefärbtes kristallini sches Pulver, das sich in Wasser unter Bil dung einer stark schäumenden und gegen Essigsäure ziemlich beständigen Lösung auf löst. Es kann als Tegtilbilfsstoff, zum Bei spiel als Schaummittel, verwendet werden. <I>Beispiel:</I> 50 Gewichtsteile ss-Undecylbenzimidazol werden bei 15-20 allmählich unter Rühren in 100 Gewichtsteile Schwefelsäuremonohydrat eingetragen und, nachdem sich alles gelöst hat, bei 0-3 innerhalb 10 Minuten mit 5 Ge wichtsteilen Phosphortrichlorid versetzt.
Hier auf wird bei gleicher Temperatur noch 1/z Stunde gerührt. Dann lässt man innerhalb einer Stunde 13 Volumenteile Isopropylal- kohol langsam hinzufliessen, worauf unter Rühren innerhalb einer halben Stunde die Temperatur auf<B>50-52'</B> gesteigert wird. Die Reaktionsmasse wird während 6 Stunden unter den angegebenen Bedingungen weiter gerührt.
Nun kühlt man letztere auf l0-12 ab und sulfoniert in üblicher Weise mit 24 /o SOS enthaltender Schwefelsäure, bis eine Probe der mit Natriumcarbonat neutralisier ten Reaktionsmasse in Essigsäure nur noch eine schwach opaleszente Lösung gibt.
Man giesst dann das Sulfonierungsgemisch auf Eis und filtriert die abgeschiedene Sul- fonsäure ab.
Durch Verteilen der Säure in Wasser und Neutralisieren mit Natriumbydrogyd- lösung erhält man nach dem Eindampfen der klaren Lösung das Natriunisalz der neuen Sulfonsäure als hellgefärbtes, kristallinisches Pulver, das sich in Wasser unter Bildung einer stark schäumenden und gegen Essig säure ziemlich beständigen Lösung auflöst.
Process for the preparation of a new sulfonic acid. It has been found that a new sulfonic acid is obtained if a undecylbenzimidazole is condensed with isopropyl alcohol in the presence of a dehydrating agent and the condensation product obtained is treated with a sulfonating agent.
In the present case, sulfuric acid monobydrate is particularly suitable as a dehydrating agent.
In the form of its sodium salt, the new sulfonic acid forms a light-colored crystalline powder that dissolves in water to form a strongly foaming solution that is fairly resistant to acetic acid. It can be used as a Tegtilbilfsstoff, for example as a foaming agent. <I> Example: </I> 50 parts by weight of s-undecylbenzimidazole are gradually added with stirring to 100 parts by weight of sulfuric acid monohydrate at 15-20 and, after everything has dissolved, 5 parts by weight of phosphorus trichloride are added within 10 minutes at 0-3.
Here at the same temperature is stirred for 1/2 hour. Then 13 parts by volume of isopropyl alcohol are allowed to flow in slowly over the course of an hour, whereupon the temperature is increased to <B> 50-52 '</B> within half an hour while stirring. The reaction mass is stirred for a further 6 hours under the specified conditions.
The latter is then cooled to 10-12 and sulfonated in the usual way with sulfuric acid containing 24 / o SOS until a sample of the reaction mass neutralized with sodium carbonate in acetic acid only gives a slightly opalescent solution.
The sulphonation mixture is then poured onto ice and the sulphonic acid which has separated out is filtered off.
By distributing the acid in water and neutralizing it with sodium hydroxide solution, after evaporation of the clear solution, the sodium salt of the new sulfonic acid is obtained as a light-colored, crystalline powder, which dissolves in water to form a strongly foaming solution that is fairly resistant to acetic acid.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH212640T | 1939-01-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH212640A true CH212640A (en) | 1940-12-15 |
Family
ID=4447891
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH212640D CH212640A (en) | 1939-01-30 | 1939-01-30 | Process for the preparation of a new sulfonic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH212640A (en) |
-
1939
- 1939-01-30 CH CH212640D patent/CH212640A/en unknown
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