DE489183C - Process for the preparation of 2-chloropyridine - Google Patents
Process for the preparation of 2-chloropyridineInfo
- Publication number
- DE489183C DE489183C DED51869D DED0051869D DE489183C DE 489183 C DE489183 C DE 489183C DE D51869 D DED51869 D DE D51869D DE D0051869 D DED0051869 D DE D0051869D DE 489183 C DE489183 C DE 489183C
- Authority
- DE
- Germany
- Prior art keywords
- chloropyridine
- preparation
- phosgene
- alkyl
- pyridone
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Landscapes
- Pyridine Compounds (AREA)
Description
Verfahren zur Herstellung von 2-Chlorpyridin Es ist bereits bekannt, N-Alkyl-2-pyridone durch Behandeln mit Phosphorpentachlorid in 2-Chlorpyridin überzuführen.Process for the preparation of 2-chloropyridine It is already known Convert N-alkyl-2-pyridones into 2-chloropyridine by treatment with phosphorus pentachloride.
Es wurde nun die überraschende Beobachtung gemacht, daß es auch möglich ist, N-Alkyl-2-pyridone durch Behandeln mit dem erheblich billigeren Phosgen in glatt verlaufender Reaktion , in 2-Chlorpyridin überzuführen, und zwar bei ungefähr den gleichen Temperaturen, wie sie bei Verwendung von Phosphorpentachlorid als Chlorierungsmittel erforderlich sind.The surprising observation has now been made that it is also possible is, N-alkyl-2-pyridone by treating with the considerably cheaper phosgene in smooth reaction to convert to 2-chloropyridine, at about the same temperatures as when using phosphorus pentachloride as the chlorinating agent required are.
Beispiel q.o g N-Methyl(Äthyl)-2-pyridon werden in einem Gefäß mit Rückflußkühler bei Temperaturen von etwa z2o ° durch langsames Einleiten von Phosgen chloriert. Die Masse bleibt hierbei flüssig, nur einige Kriställchen sublimieren gelegentlich in den Kühler. Nachdem das Endprodukt ein Gewicht von etwa 43 bis 45 g erreicht hat, wird es aufgearbeitet, z. B. derart, daß es mit wenig Natronlauge versetzt und der `'4 asserdampfdestillation unterworfen wird. Man erhält etwa 39 g 2-Chlorpyridin, was einer Ausbeute von etwa 93 bis 9q. °/o entspricht.Example qo g of N-methyl (ethyl) -2-pyridone are chlorinated in a vessel with a reflux condenser at temperatures of about 20 ° by slowly passing in phosgene. The mass remains liquid, only a few crystals occasionally sublime into the cooler. After the end product has reached a weight of about 43 to 45 g, it is worked up, e.g. B. in such a way that it is mixed with a little sodium hydroxide solution and subjected to water vapor distillation. About 39 g of 2-chloropyridine are obtained, which corresponds to a yield of about 93 to 9q. ° / o corresponds.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED51869D DE489183C (en) | 1926-12-04 | 1926-12-04 | Process for the preparation of 2-chloropyridine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED51869D DE489183C (en) | 1926-12-04 | 1926-12-04 | Process for the preparation of 2-chloropyridine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE489183C true DE489183C (en) | 1930-01-14 |
Family
ID=7053722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DED51869D Expired DE489183C (en) | 1926-12-04 | 1926-12-04 | Process for the preparation of 2-chloropyridine |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE489183C (en) |
-
1926
- 1926-12-04 DE DED51869D patent/DE489183C/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE489183C (en) | Process for the preparation of 2-chloropyridine | |
| DE873542C (en) | Process for the production of aromatic polycarboxylic acids and inorganic by-products consisting predominantly of aluminum sulfate | |
| AT114027B (en) | Process for the preparation of 2-chloropyridine. | |
| DE670130C (en) | Process for the preparation of fluorine compounds of aliphatic hydrocarbons | |
| CH132026A (en) | Process for the preparation of 2-chloropyridine. | |
| DE643341C (en) | Process for the production of ª ‡ -AEthyl-ª ‰ -propylacrolein | |
| DE2060259A1 (en) | Phenyl-vinyl-phosphonic acids and processes for their production | |
| DE686109C (en) | sulfuric acid from waste acids | |
| DE547882C (en) | Process for the preparation of primary alkali orthophosphates | |
| DE648368C (en) | Process for the production of iron sulfate chloride containing water of crystallization | |
| DE669187C (en) | Process for the production of vitamin B. | |
| DE687670C (en) | Process for the production of chlorides of high molecular weight fatty acids | |
| AT126156B (en) | Procedure for representing asymm. Dichloroethylene. | |
| DE371294C (en) | Process for the preparation of calcium hypochlorite compounds | |
| DE545399C (en) | Process for the preparation of 2- [4'-oxybenzoyl] benzoic acid and its salts | |
| DE712784C (en) | Process for the direct production of practically pure hexachloroethane from perchlorethylene and chlorine | |
| DE863937C (en) | Process for the preparation of 1,4-dichloro- or 1,4-dibromobutane | |
| AT73378B (en) | Process for the preparation of protocatechuic acid and protocatechuic dehydration from piperonal. | |
| DE666517C (en) | Digestion of cyan nitrogen titanium | |
| DE507210C (en) | Process for the production of oxyanthraquinones, in particular alizarin | |
| DE549645C (en) | Manufacture of calcium chlorate | |
| DE881039C (en) | Process for the preparation of the pentaerythritol dichlorohydrin monosulfuric acid ester | |
| DE638488C (en) | Process for the production of neutral aluminum acetate | |
| DE568210C (en) | Process for the preparation of 1-amino-2-chloroanthraquinone | |
| AT134623B (en) | Process for the preparation of compounds of carbamic acid esters. |