GB900801A - Process for the preparation of lactams - Google Patents
Process for the preparation of lactamsInfo
- Publication number
- GB900801A GB900801A GB3189559A GB3189559A GB900801A GB 900801 A GB900801 A GB 900801A GB 3189559 A GB3189559 A GB 3189559A GB 3189559 A GB3189559 A GB 3189559A GB 900801 A GB900801 A GB 900801A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oleum
- solvent
- lactam
- immiscible
- oxime
- 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
- C07D—HETEROCYCLIC COMPOUNDS
- C07D201/00—Preparation, separation, purification or stabilisation of unsubstituted lactams
- C07D201/02—Preparation of lactams
- C07D201/04—Preparation of lactams from or via oximes by Beckmann rearrangement
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Other In-Based Heterocyclic Compounds (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
In a process for preparing a lactam by the Beckmann rearrangement of a moist cycloalkanone oxime in the presence of oleum, the oxime is dissolved in a substantially inert solvent which forms the upper layer of a system comprising oleum and the solvent, said solvent being immiscible with oleum and immiscible or at most partially miscible with water, whereby the rearrangement occurs at the interface between the solvent and the oleum. Suitable solvents include paraffins, cycloparaffins and halogenated hydrocarbons. The lactam may be recovered from the oleum layer. The process may be operated batchwise or continuously. Caprolactam, valerolactam and capryl lactam are prepared in examples.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2814858 | 1958-10-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB900801A true GB900801A (en) | 1962-07-11 |
Family
ID=12240662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3189559A Expired GB900801A (en) | 1958-10-02 | 1959-09-18 | Process for the preparation of lactams |
Country Status (2)
| Country | Link |
|---|---|
| CH (1) | CH386426A (en) |
| GB (1) | GB900801A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4257950A (en) * | 1978-10-16 | 1981-03-24 | Basf Aktiengesellschaft | Continuous preparation of ε-caprolactam by Beckmann rearrangement |
-
1959
- 1959-09-18 GB GB3189559A patent/GB900801A/en not_active Expired
- 1959-09-30 CH CH7883659A patent/CH386426A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4257950A (en) * | 1978-10-16 | 1981-03-24 | Basf Aktiengesellschaft | Continuous preparation of ε-caprolactam by Beckmann rearrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| CH386426A (en) | 1965-01-15 |
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