DE923913C - Process for the preparation of ketoximes - Google Patents
Process for the preparation of ketoximesInfo
- Publication number
- DE923913C DE923913C DEB21263A DEB0021263A DE923913C DE 923913 C DE923913 C DE 923913C DE B21263 A DEB21263 A DE B21263A DE B0021263 A DEB0021263 A DE B0021263A DE 923913 C DE923913 C DE 923913C
- Authority
- DE
- Germany
- Prior art keywords
- salts
- ketoximes
- preparation
- parts
- thiosulfuric acid
- 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
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Materials For Photolithography (AREA)
Description
Verfahren zur Herstellung von Ketoximen Im Patent c921 752 ist ein Verfahren zur Herstellung von Ketoximen beschrieben, bei dem man sekundäre aliphatische oder cycloaliphatische Nitroverbindungen in Form ihrer Salze oder der freien aci-Formen in saurem Medium mit Thioschwefelsäure bzw. ihren wasserlöslichen Salzen umsetzt.Process for the preparation of ketoximes In patent c921 752 is a Process for the preparation of ketoximes described in which one secondary aliphatic or cycloaliphatic nitro compounds in the form of their salts or the free aci forms Reacts in an acidic medium with thiosulfuric acid or its water-soluble salts.
Es wurde nun gefunden, daß man bei diesem Verfahren an Stelle von Thiosch-,vefelsäure bzw. ihren Salzen auch solche Reaktionsgemische verwenden kann, aus denen sich in an sich bekannter Weise Thioschwefelsäure bzw. ihre Salze bilden können. Solche Reaktionsgemische bestehen z. B. aus etwa äquivalenten Mengen von wasserlöslichen Sulfiten und Schwefel, von Sulfiden und Schwefeldioxyd, von Sulfiden und Polythionaten oder von Polythionaten und Alkalien. Die Bildung der Thioschwefelsäure bzw. ihrer Salze erfolgt hierbei in Gegenwart der Nitroverbindungen bzw. ihrer Salze. Im übrigen vollzieht man die- Umwandlung der Nitroverbindungen in die gewünschten Oxime in der im Hauptpatent beschriebenen Weise, indem man das gesamte Gemisch auf einen sauren pH-Wert bringt bzw. einen solchen durch laufende oder wiederholte Zugabe von z. B. Mineralsäure aufrechterhält.It has now been found that instead of Thioschic acid, vefelsic acid or its salts can also use such reaction mixtures, from which thiosulphuric acid or its salts are formed in a manner known per se can. Such reaction mixtures exist z. B. from approximately equivalent amounts of water-soluble sulphites and sulfur, of sulphides and sulfur dioxide, of sulphides and polythionates or of polythionates and alkalis. The formation of thiosulfuric acid or their salts are carried out in the presence of the nitro compounds or their salts. Otherwise, the conversion of the nitro compounds into the desired ones is carried out Oxime in the manner described in the main patent by adding the entire mixture brings about an acidic pH value or one through continuous or repeated addition from Z. B. maintains mineral acid.
Alle Varianten des Verfahrens des Hauptpatents sind auch bei der hier beschriebenen Ausführungsform anwendbar. Die in dem Beispiel genannten Teile sind Gewichtsteile.All variants of the process of the main patent are also here described embodiment applicable. The ones mentioned in the example Parts are parts by weight.
Beispiel Man gibt zu einer Lösung von 64,5 Teilen Nitrocyclohexan in 235 Teilen 9°/niger Natronlauge 252 Teile kristallisiertes Natriumsulfit, 32 Teile Schwefelpulver und Zoo Teile Wasser und schüttelt das Gemisch bei gewöhnlicher Temperatur, bis der Schwefel völlig gelöst ist. Dann läßt man die nötigenfalls filtrierte Lösung bei etwa 2o° unter kräftigem Rühren in goo Teile 2 n-Schwefelsäure einlaufen. Dabei kristallisiert bereits ein erheblicher Anteil des entstandenen Cyclohexanonoxims aus. Man neutralisiert mit Natriumcarbonatlösung und saugt das Oxim ab. Aus dem Filtrat kann man durch Extrahieren, z. B. mit Äther, weitere Mengen Oxim gewinnen. Die Gesamtausbeute beträgt 50 bis 52 Teile reines Cyclohexanonoxim, entsprechend rund 9o °/u der Theorie, berechnet auf angewendetes Nitrocyclohexan.EXAMPLE 252 parts of crystallized sodium sulfite, 32 parts of powdered sulfur and zoo parts of water are added to a solution of 64.5 parts of nitrocyclohexane in 235 parts of 9% sodium hydroxide solution, and the mixture is shaken at ordinary temperature until the sulfur is completely dissolved. The solution, filtered if necessary, is then allowed to run into 2o parts of 2N sulfuric acid at about 20 ° with vigorous stirring. A considerable proportion of the resulting cyclohexanone oxime crystallizes out. It is neutralized with sodium carbonate solution and the oxime is filtered off with suction. From the filtrate can be extracted by extracting, for. B. with ether, gain additional amounts of oxime. The total yield is 50 to 52 parts of pure cyclohexanone oxime, corresponding to around 90 ° / u of theory, calculated on the nitrocyclohexane used.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB21263A DE923913C (en) | 1952-07-20 | 1952-07-20 | Process for the preparation of ketoximes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB21263A DE923913C (en) | 1952-07-20 | 1952-07-20 | Process for the preparation of ketoximes |
Publications (1)
Publication Number | Publication Date |
---|---|
DE923913C true DE923913C (en) | 1955-02-24 |
Family
ID=6960584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB21263A Expired DE923913C (en) | 1952-07-20 | 1952-07-20 | Process for the preparation of ketoximes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE923913C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1021358B (en) * | 1955-01-13 | 1957-12-27 | Basf Ag | Process for the preparation of oximes |
FR2504482A1 (en) * | 1981-04-22 | 1982-10-29 | Skirail Sa | Security circuit for cable operated transport system - uses interrupters along security line, with resistors in parallel with each interrupter so that fault is readily located |
-
1952
- 1952-07-20 DE DEB21263A patent/DE923913C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1021358B (en) * | 1955-01-13 | 1957-12-27 | Basf Ag | Process for the preparation of oximes |
FR2504482A1 (en) * | 1981-04-22 | 1982-10-29 | Skirail Sa | Security circuit for cable operated transport system - uses interrupters along security line, with resistors in parallel with each interrupter so that fault is readily located |
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