CH245679A - Process for the preparation of a 4-chloro-benzenesulfonamide. - Google Patents
Process for the preparation of a 4-chloro-benzenesulfonamide.Info
- Publication number
- CH245679A CH245679A CH245679DA CH245679A CH 245679 A CH245679 A CH 245679A CH 245679D A CH245679D A CH 245679DA CH 245679 A CH245679 A CH 245679A
- Authority
- CH
- Switzerland
- Prior art keywords
- chloro
- benzenesulfonamide
- parts
- preparation
- amide
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C311/00—Amides of sulfonic acids, i.e. compounds having singly-bound oxygen atoms of sulfo groups replaced by nitrogen atoms, not being part of nitro or nitroso groups
- C07C311/15—Sulfonamides having sulfur atoms of sulfonamide groups bound to carbon atoms of six-membered aromatic rings
Description
Verfahren zur Herstellung eines 4-Chlor-benzolsulfonamides. Gegenstand des vorliegenden Patentes ist ein Verfahren zur Herstellung eines substi tuierten 4 - Chlor - benzolsulfonamides. Das Verfahren ist dadurch gekennzeichnet, dass man 4 - Chlor - benzolsulfonamid mit einem methylierenden Mittel behandelt.
Die ent standene neue Verbindung, das 4-Chlor-ben- zolsulfon-N-dimethyl - amid, bildet farblose Kristalle vom Schmelzpunkt 80 und siedet unter einem Druck von 0;05 mm bei 140 . Sie soll als Milbenbekämpfungsmittel Ver wendung finden.
<I>Beispiel:</I> Zu 19,1 Teilen 4-Chlor-benzolsulfonamid und 10,6 Teilen calcinierter Soda in 50 Tei len Chlorbenzol gibt man 13 Teile Dimethyl- sulfat und kocht das Ganze unter gutem Rüh ren während 4 .Stunden am Rückfluss. Hier auf wird heiss abgesogen, das Filtrat mit Natronlauge alkalisch gemacht und daraus das Chlorbenzol mit Wasserdampf abgebla sen.
Die verbleibende alkalische Lösung wird heiss filtriert und daraus das 4-Chlor-benzol- sulfon-N-methyl-amid mit Säure ausgefällt, abgesogen und getrocknet. Es schmilzt bei 62 bis 64 .
20,5 Teile dieses Produktes werden in absolutem Alkohol gelöst und zu einer Lö sung von 2,3 Teilen Natrium in 32 Teilen absolutem Alkohol gegeben. Man destilliert den Alkohol ab und erwärmt das- zurück bleibende Natriumsalz in 50 Teilen Chlor benzol mit 15 Teilen Dimethylsulfat wäh rend 15 Stunden auf 70, bis 80 .
Aus der filtrierten Lösung wird hierauf das Chlor benzol mit Wasserdampf abgeblasen, der Rückstand mehrmals ausgeäthert und der Äther abdestilliert. Das zurückbleibende 4-Chlor-benzolsulfon-N-dimethyl-amid kann im Hochvakuum destilliert oder aus Methanol umkristallisiert werden. Es bildet farblose Kristalle vom Schmelzpunkt 80 und siedet unter einem Druck von 0;05 mm bei 140 .
Wenn man 19,1 Teile 4-Chlor-benzolsulf- amid mit 4,6 Teilen Natrium und hierauf mit 3,0 Teilen Dimethylsulfat wie im 2. Teil des obigen Beispiels beschrieben zur Um setzung bringt, gelangt man in einer einzi gen Stufe zum gleichen Produkt.
Process for the preparation of a 4-chloro-benzenesulfonamide. The present patent relates to a process for the preparation of a substituted 4-chloro-benzenesulfonamide. The process is characterized in that 4 - chloro - benzenesulfonamide is treated with a methylating agent.
The resulting new compound, 4-chlorobenzenesulfone-N-dimethyl-amide, forms colorless crystals with a melting point of 80 and boils at 140 under a pressure of 0.05 mm. It should be used as a mite control agent.
<I> Example: </I> 13 parts of dimethyl sulfate are added to 19.1 parts of 4-chlorobenzenesulfonamide and 10.6 parts of calcined soda in 50 parts of chlorobenzene and the whole is boiled for 4 hours with thorough stirring at the reflux. Here, hot suction is performed, the filtrate is made alkaline with sodium hydroxide solution and the chlorobenzene is blown off with steam.
The remaining alkaline solution is filtered while hot and the 4-chloro-benzenesulfone-N-methyl-amide is precipitated with acid, filtered off with suction and dried. It melts at 62 to 64.
20.5 parts of this product are dissolved in absolute alcohol and added to a solution of 2.3 parts of sodium in 32 parts of absolute alcohol. The alcohol is distilled off and the remaining sodium salt is heated in 50 parts of chlorobenzene with 15 parts of dimethyl sulfate for 15 hours to 70 to 80.
The chlorobenzene is then blown off from the filtered solution with steam, the residue is extracted with ether several times and the ether is distilled off. The remaining 4-chloro-benzenesulphone-N-dimethyl-amide can be distilled in a high vacuum or recrystallized from methanol. It forms colorless crystals with a melting point of 80 and boils under a pressure of 0.05 mm at 140.
If 19.1 parts of 4-chloro-benzenesulfamide are reacted with 4.6 parts of sodium and then with 3.0 parts of dimethyl sulfate as described in the 2nd part of the above example, the same is achieved in a single stage Product.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH245679T | 1945-06-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH245679A true CH245679A (en) | 1946-11-30 |
Family
ID=4465066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH245679D CH245679A (en) | 1945-06-28 | 1945-06-28 | Process for the preparation of a 4-chloro-benzenesulfonamide. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH245679A (en) |
-
1945
- 1945-06-28 CH CH245679D patent/CH245679A/en unknown
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