CH137947A - Process for the preparation of a carboxyamidobenzene-o-thioglycolic acid. - Google Patents
Process for the preparation of a carboxyamidobenzene-o-thioglycolic acid.Info
- Publication number
- CH137947A CH137947A CH137947DA CH137947A CH 137947 A CH137947 A CH 137947A CH 137947D A CH137947D A CH 137947DA CH 137947 A CH137947 A CH 137947A
- Authority
- CH
- Switzerland
- Prior art keywords
- acid
- thioglycolic acid
- preparation
- carboxyamidobenzene
- ethoxy
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung einet Carboxyamidobenzol-o-thioglykolsäure. Gegenstand dieses Patentes ist ein Ver fahren zur Darstellung der 4-Äthoxybenzol- 1-carboxyamido-2-thioglykolsäure, welches da durch gekennzeichnet ist, dass man auf die 4-Äthoxy- 1 - cyanbenzol - 2 - thioglykolsäure saure Verseifungsmittel einwirken lässt.
<I>Beispiele</I> 1. 223 Gewichtsteile 4-Äthoxy-1-cyan- benzol-2-thioglykolsäure, die man beispiels weise erhält, wenn man vom p-Phenetidin ausgehend nach den Schweizer-Patentschriften Nr. 77187 und. 92588 arbeitet, werden mit 1100 Gewichtsteilen Schwefelsäure 90 %ig zusammengebracht und 10 Minuten auf<B>900</B> erwärmt. Man giesst auf Eis und saugt den erhaltenen Niederschlag von 4-Äthoxybenzol- 1-carboxyamino-2-thioglykolsäure nach einiger Zeit ab.
Die Verbindung wird durch Lösen in wässerigem Ammoniak, Aufkochen der erhaltenen Lösung mit Tierkohle, Filtration und Fällung mit verdünnter Schwefelsäure gereinigt. Sie besitzt, aus Eisessig umkristalli siert, den F. P. 208-210 0. Das Produkt dient als Zwischenprodukt zur Herstellung von Farbstoffen.
2. 10 Gewichtsteile 4-Äthoxy-l-cyanben- zol-2-thioglykolsäure werden in<B>190</B> Volumen- teilen Schwefelsäure 90 % bei Zimmertempe- ratur gelöst. Nach 18stündigem Stehen wird in 210 Teile Wasser gegossen. Die Verbin dung fällt erst ölig aus; sie wird schnell fest und besitzt, wenn man sie der gleichen Reinigungsmethode unterzieht die gleichen Eigenschaften, wie die Verbindung des Bei spiels 1 dieses Zusatzpatentes.
Process for the preparation of a carboxyamidobenzene-o-thioglycolic acid. The subject of this patent is a process for the preparation of 4-ethoxybenzene-1-carboxyamido-2-thioglycolic acid, which is characterized by the fact that the 4-ethoxy-1-cyanobenzene-2-thioglycolic acid saponifying agent is allowed to act.
<I> Examples </I> 1. 223 parts by weight of 4-ethoxy-1-cyanobenzene-2-thioglycolic acid, which is obtained, for example, when starting from p-phenetidine according to Swiss patents No. 77187 and. 92588 works, 90% strength is combined with 1100 parts by weight of sulfuric acid and heated to <B> 900 </B> for 10 minutes. It is poured onto ice and the resulting precipitate of 4-ethoxybenzene-1-carboxyamino-2-thioglycolic acid is filtered off with suction after a while.
The compound is purified by dissolving it in aqueous ammonia, boiling the resulting solution with animal charcoal, filtration and precipitation with dilute sulfuric acid. It has, recrystallized from glacial acetic acid, the F. P. 208-210 0. The product is used as an intermediate for the production of dyes.
2. 10 parts by weight of 4-ethoxy-1-cyanobenzene-2-thioglycolic acid are dissolved in 190 parts by volume of sulfuric acid 90% at room temperature. After standing for 18 hours, it is poured into 210 parts of water. The compound turns out oily at first; it solidifies quickly and, when subjected to the same cleaning method, has the same properties as the compound in Example 1 of this additional patent.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE137947X | 1927-04-16 | ||
CH134942T | 1928-04-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH137947A true CH137947A (en) | 1930-01-31 |
Family
ID=25712395
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH137947D CH137947A (en) | 1927-04-16 | 1928-04-14 | Process for the preparation of a carboxyamidobenzene-o-thioglycolic acid. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH137947A (en) |
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1928
- 1928-04-14 CH CH137947D patent/CH137947A/en unknown
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