GB758076A - An improvement in or relating to the manufacture of a pyridine homologue - Google Patents
An improvement in or relating to the manufacture of a pyridine homologueInfo
- Publication number
- GB758076A GB758076A GB2848654A GB2848654A GB758076A GB 758076 A GB758076 A GB 758076A GB 2848654 A GB2848654 A GB 2848654A GB 2848654 A GB2848654 A GB 2848654A GB 758076 A GB758076 A GB 758076A
- Authority
- GB
- United Kingdom
- Prior art keywords
- paraldehyde
- ammonium
- methylpyridine
- ammonia
- ethyl
- 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)
Abstract
5-Ethyl-2-methylpyridine is prepared by heating under pressure to a temperature of at least 160 DEG C. paraldehyde and an aqueous solution of at least one of the ammonium salts ammonium acetate, ammonium propionate and triammonium phosphate, the molar concentration of the ammonium salt being preferably equivalent to at least 3 moles. ammonia to every 4 moles. of paraldehyde. The reaction product is normally treated with ammonia to neutralize the acid formed and 5-ethyl-2-methylpyridine isolated by extraction with a volatile organic solvent, particularly chlorinated hydrocarbons, or aromatic hydrocarbons (e.g. benzene or toluene). The remaining aqueous layer is then concentrated by evaporation and recycled with more paraldehyde. Alternatively, the pyridine derivative is separated by steam-distillation, preferably after neutralization as above. In examples: (1) paraldehyde and claved at 200 DEG C., mixture cooled, neutralized with ammonia, and 5-ethyl-2-methylpyridine isolated by extraction with chloroform or trichlorethylene and fractionation of the organic layer; (2) and (3) as in (1), using ammonium propionate and triammonium phosphate respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2848654A GB758076A (en) | 1954-10-04 | 1954-10-04 | An improvement in or relating to the manufacture of a pyridine homologue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2848654A GB758076A (en) | 1954-10-04 | 1954-10-04 | An improvement in or relating to the manufacture of a pyridine homologue |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB758076A true GB758076A (en) | 1956-09-26 |
Family
ID=10276407
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2848654A Expired GB758076A (en) | 1954-10-04 | 1954-10-04 | An improvement in or relating to the manufacture of a pyridine homologue |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB758076A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3932421A (en) * | 1967-07-13 | 1976-01-13 | Koei Chemical Company, Ltd. | Process for producing alkylpyridines |
| CN115353496A (en) * | 2022-06-20 | 2022-11-18 | 连云港市三联化工有限公司 | Continuous production process of 1, 2-benzisothiazolin-3-one |
-
1954
- 1954-10-04 GB GB2848654A patent/GB758076A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3932421A (en) * | 1967-07-13 | 1976-01-13 | Koei Chemical Company, Ltd. | Process for producing alkylpyridines |
| CN115353496A (en) * | 2022-06-20 | 2022-11-18 | 连云港市三联化工有限公司 | Continuous production process of 1, 2-benzisothiazolin-3-one |
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