AT133155B - Process for the preparation of carbamic acid esters. - Google Patents
Process for the preparation of carbamic acid esters.Info
- Publication number
- AT133155B AT133155B AT133155DA AT133155B AT 133155 B AT133155 B AT 133155B AT 133155D A AT133155D A AT 133155DA AT 133155 B AT133155 B AT 133155B
- Authority
- AT
- Austria
- Prior art keywords
- carbamic acid
- preparation
- acid esters
- heterocyclic
- aromatic
- Prior art date
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Darstellung von Carbaminsäureestern.
EMI1.1
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Dimethylcarbaminsäurechlorid in Benzol zwei Stunden auf dem Dampfbad erhitzt. Die Benzol- losung wird dann mit Wasser und Natronlauge gewaschen und im Vakuum destilliert. Der erhaltene Dimethylcarbaminsäureester des 8-Oxvehinolins schmilzt nach dem Umkristallisieren aus Äther bei 80 und bildet ein bei 195 schmelzendes Hydrochlorid.
Beispiel 4 : Eine Lösung von 103 Gewichtsteilen 3-Dimethylaminophenol und 30 Gewichtsteilen Natriumhydroxyd in 250 Teilen Wasser wird auf dem Dampfbad bei 15/lHII Druck eingedampft. Der Rückstand wird in eine Lösung von 75 Gewichtsteilen Dimethylcarbaminsäurechlorid in 200 Teilen Benzol unter Schütteln eingetragen. Zum Schluss wird das Gemisch noch zwei Stunden unter Rückfluss auf dem Dampfbad erhitzt. Hierauf wird das ausgeschiedene Kochsalz in Wasser aufgenommen, die Benzolschicht nochmals mit Natronlauge und Wasser gewaschen. das Lösungsmittel abdestilliert und der Rückstand der Vakuumdestillation unterworfen. Man erhält ungefähr 100 Gewichtsteile Dimethylcarbaminsäure-[3-dimethylaminophenyl]-ester als farbloses Öl vom Kp15 = 190 . Mit Dimethylsulfat bildet dieser Ester eine bei 143 schmelzende quartäre Verbindung.
<Desc / Clms Page number 1>
Process for the preparation of carbamic acid esters.
EMI1.1
<Desc / Clms Page number 2>
Dimethylcarbamic acid chloride in benzene heated on the steam bath for two hours. The benzene solution is then washed with water and sodium hydroxide solution and distilled in vacuo. The dimethylcarbamic acid ester of 8-oxvehinoline obtained melts at 80 after recrystallization from ether and forms a hydrochloride which melts at 195.
Example 4: A solution of 103 parts by weight of 3-dimethylaminophenol and 30 parts by weight of sodium hydroxide in 250 parts of water is evaporated on a steam bath at a pressure of 15/1. The residue is introduced into a solution of 75 parts by weight of dimethylcarbamic acid chloride in 200 parts of benzene with shaking. Finally, the mixture is refluxed on the steam bath for a further two hours. The precipitated common salt is then taken up in water, and the benzene layer is washed again with sodium hydroxide solution and water. the solvent is distilled off and the residue is subjected to vacuum distillation. About 100 parts by weight of dimethylcarbamic acid [3-dimethylaminophenyl] ester are obtained as a colorless oil with a boiling point of 190. With dimethyl sulfate this ester forms a quaternary compound which melts at 143.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE133155X | 1931-01-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT133155B true AT133155B (en) | 1933-05-10 |
Family
ID=5664848
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT133155D AT133155B (en) | 1931-01-02 | 1931-03-21 | Process for the preparation of carbamic acid esters. |
AT156371D AT156371B (en) | 1931-01-02 | 1938-03-24 | Process for the preparation of carbamic acid esters. |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT156371D AT156371B (en) | 1931-01-02 | 1938-03-24 | Process for the preparation of carbamic acid esters. |
Country Status (1)
Country | Link |
---|---|
AT (2) | AT133155B (en) |
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1931
- 1931-03-21 AT AT133155D patent/AT133155B/en active
-
1938
- 1938-03-24 AT AT156371D patent/AT156371B/en active
Also Published As
Publication number | Publication date |
---|---|
AT156371B (en) | 1939-06-26 |
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