DE867394C - Process for the preparation of sulfur-containing ª ‰ -dicarbonyl compounds - Google Patents
Process for the preparation of sulfur-containing ª ‰ -dicarbonyl compoundsInfo
- Publication number
- DE867394C DE867394C DEB14249A DEB0014249A DE867394C DE 867394 C DE867394 C DE 867394C DE B14249 A DEB14249 A DE B14249A DE B0014249 A DEB0014249 A DE B0014249A DE 867394 C DE867394 C DE 867394C
- Authority
- DE
- Germany
- Prior art keywords
- sulfur
- preparation
- dicarbonyl compounds
- compounds
- acid esters
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
- C07C319/14—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides
- C07C319/20—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides by reactions not involving the formation of sulfide groups
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Verfahren zur Darstellung von schwefelhaltigen ß-Dicarbonylverbindungen Bringt man a-halogenierte Thioäther mit ß-Dicarbonylverbindungen, z. B. Acetessigester oder Malonester, zur Umsetzung, so sind schwefelhaltige Derivate nicht oder nur mit beträchtlichen Schwierigkeiten zu erhalten. Als Grund hierfür wurde erkannt, daß die zunächst entstandenen Produkte unter Abspaltung von Merkaptanen und Bildung ungesättigter Verbindungen zerfallen. Es ist ferner bekannt, monosubstituierte Malonsäureester, z. B. n-Butylmalonsäurediäthylester, mit einem Alkylchlormethylsulfid, dessen Alkylgruppe i bis io C-Atome aufweist, zu einem Alkylalkylthiomethylmalonester umzusetzen.Process for the preparation of sulfur-containing ß-dicarbonyl compounds If you bring a-halogenated thioethers with ß-dicarbonyl compounds, z. B. acetoacetic ester or malonic esters, for the implementation, sulfur-containing derivatives are not or only with considerable difficulty to obtain. The reason for this was recognized that the products initially formed with splitting off of mercaptans and formation unsaturated compounds disintegrate. It is also known to use monosubstituted malonic acid esters, z. B. n-Butylmalonsäurediethylester, with an alkyl chloromethyl sulfide, the alkyl group has i to io carbon atoms to convert to an alkylalkylthiomethylmalonic ester.
Es wurde nun gefunden, daß die Umsetzung auch bei ß-Diketonen und ß-Ketocarbonsäureestern glatt gelingt, wenn man von solchen ß-Diketonen oder ß-Ketocarbonsäureesteni ausgeht, die in der reaktionsfähigen Methylengruppe monosubstituiert sind. Läßt man z. B. auf Salze dieser Verbindungen a-halogenierte Thioäther einwirken, so gelingt die Einführung schwefelhaltiger Gruppen ohne Schwierigkeit, und man erhält beständige Verbindungen.It has now been found that the implementation also with ß-diketones and ß-Ketocarboxylic acid esters succeed smoothly if you use such ß-diketones or ß-ketocarboxylic acid esters proceeds, which are monosubstituted in the reactive methylene group. Leaves one z. B. act on salts of these compounds a-halogenated thioethers, so succeeds the introduction of sulphurous groups without difficulty, and permanent ones are obtained Links.
Die verfahrensgemäß hergestellten Produkte können als Lösungsmittel, Riechstoffe, Schädlingsbekämpfungsmittel, Weichmacher sowie als Zwischenprodukte für organische Synthesen, insbesondere zur Herstellung von pharmazeutischen Produkten, dienen.The products manufactured according to the process can be used as solvents, Fragrances, pesticides, plasticizers and as intermediates for organic syntheses, especially for the manufacture of pharmaceutical products, to serve.
Beispiel i Zu i g unter ioo ccm absolutem Äther befindlichem h,'atriumdraht werden unter Rühren 7,8 g a-Methyl-a-benzoylaceton getropft, wobei sich unter Erwärmen und lebhafter Wasserstoffentwicklung das in Äther lösliche Natriumsalz bildet. Unter weiterem Rühren werden 4,3 g Chlormethylmethylsulfid zugetropft, und das Ganze wird anschließend 2 Stunden auf dem Wasserbad erhitzt. Durch Zusatz von Wasser wird das ausgeschiedene Natriumchlorid abgetrennt, die ätherische Phase über Calciumchlorid getrocknet und anschließend fraktioniert, wobei 5,5 g a-11rethyla-benzoyl-a-methylmerkaptomethylaceton vom Kpll i8o° erhalten werden. Beispiel a Zu 4,1 g unter ioo ccm absolutem Äther befindlichem Natriumdraht werden unter Rühren 36,8 g a-Phenylacetessigsäureäthylester getropft, wobei sich das gebildete Natriumsalz zum Teil ausscheidet. Anschließend werden unter weiterem Rühren i7 g Chlormethylmethylsulfid zugetropft, und das Ganze wird noch a Stunden auf dem Wasserbad im Sieden gehalten. Nach dem Erkalten wird zur Abtrennung des NatriumchloridsWasser zugefügt, die ätherische Phase über Calciumchlorid getrocknet und fraktioniert, wobei 25 g a-Phenyl-a-methylmerkaptomethylacetessigsäureäthylester vom Kpll 178 bis 18o° erhalten werden.EXAMPLE i 7.8 g of α-methyl-α-benzoylacetone are added dropwise with stirring to the h, atrium wire located under 100 cc of absolute ether, the sodium salt, which is soluble in ether, being formed with warming and vigorous evolution of hydrogen. With further stirring, 4.3 g of chloromethylmethyl sulfide are added dropwise, and the whole is then heated on the water bath for 2 hours. The sodium chloride which has precipitated out is separated off by adding water, the ethereal phase is dried over calcium chloride and then fractionated, with 5.5 g of α-11rethyla-benzoyl-α-methylmercaptomethylacetone can be obtained from the Kpll i8o °. EXAMPLE a 36.8 g of ethyl α-phenylacetoacetate are added dropwise with stirring to 4.1 g of sodium wire under 100 cc of absolute ether, some of the sodium salt formed separating out. Then 17 g of chloromethyl methyl sulfide are added dropwise with further stirring, and the whole is kept boiling on the water bath for a further hour. After cooling off, water is added to separate the sodium chloride, the ethereal phase is dried over calcium chloride and fractionated, with 25 g of a-phenyl-a-methylmercaptomethylacetoacetate from Kpll 178 to 18o ° can be obtained.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB14249A DE867394C (en) | 1951-03-20 | 1951-03-20 | Process for the preparation of sulfur-containing ª ‰ -dicarbonyl compounds |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB14249A DE867394C (en) | 1951-03-20 | 1951-03-20 | Process for the preparation of sulfur-containing ª ‰ -dicarbonyl compounds |
Publications (1)
Publication Number | Publication Date |
---|---|
DE867394C true DE867394C (en) | 1953-02-16 |
Family
ID=6957892
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB14249A Expired DE867394C (en) | 1951-03-20 | 1951-03-20 | Process for the preparation of sulfur-containing ª ‰ -dicarbonyl compounds |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE867394C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2809978A (en) * | 1953-12-04 | 1957-10-15 | Merck & Co Inc | Intermediates useful in the synthesis of alpha-lipoic acid |
US2828321A (en) * | 1953-10-19 | 1958-03-25 | American Cyanamid Co | Keto aliphatic acid esters and method of preparing the same |
-
1951
- 1951-03-20 DE DEB14249A patent/DE867394C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2828321A (en) * | 1953-10-19 | 1958-03-25 | American Cyanamid Co | Keto aliphatic acid esters and method of preparing the same |
US2809978A (en) * | 1953-12-04 | 1957-10-15 | Merck & Co Inc | Intermediates useful in the synthesis of alpha-lipoic acid |
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