GB645130A - Improvements in or relating to processes of preparing thioxane derivatives and the improved compounds resulting therefrom - Google Patents
Improvements in or relating to processes of preparing thioxane derivatives and the improved compounds resulting therefromInfo
- Publication number
- GB645130A GB645130A GB12603/47A GB1260347A GB645130A GB 645130 A GB645130 A GB 645130A GB 12603/47 A GB12603/47 A GB 12603/47A GB 1260347 A GB1260347 A GB 1260347A GB 645130 A GB645130 A GB 645130A
- Authority
- GB
- United Kingdom
- Prior art keywords
- acid
- methyl
- vinyl acetate
- thioxane
- thiosalicylic
- 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)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
Abstract
Thioxane derivatives of the formula <FORM:0645130/IV (b)/1> are prepared by treating vinyl acetate with a thiosalicylic acid of the formula <FORM:0645130/IV (b)/2> where X is hydrogen, chlorine, methyl, nitro or methoxy and Y is hydrogen or methyl, in the presence of an acidic catalyst. The latter may be an acid, e.g. nitric or acetic acid, an acid salt, e.g. sodium bisulphate, or a compound such as boron trifluoride or zinc chloride; mercuric acetate may also be present, as well as a polymerization inhibitor. Specified thiosalicylic acids are chlorothiosalicylic, methylthiosalicylic, dimethylthiosalicylic, nitrothiosalicylic, methoxythiosalicylic and nitro methylthiosalicylic acids. Reaction temperatures may range from room temperature to the boiling temperature, and increased pressure may be used. The process is preferably carried out by refluxing in excess vinyl acetate. Inert diluents may be used. In an example, thiosalicylic acid and excess vinyl acetate are refluxed in the presence of sulphuric acid, mercuric acetate and hydroquinone to give 2-methyl-4-keto-1 : 3-benzothioxane. The Specification as open to inspection under Sect. 91 comprises also the use of bromothiosalicylic acid as a suitable starting-material. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US645130XA | 1946-06-19 | 1946-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB645130A true GB645130A (en) | 1950-10-25 |
Family
ID=22056482
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12603/47A Expired GB645130A (en) | 1946-06-19 | 1947-05-09 | Improvements in or relating to processes of preparing thioxane derivatives and the improved compounds resulting therefrom |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB645130A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021073736A1 (en) | 2019-10-16 | 2021-04-22 | Symrise Ag | New aromatic monothioketals as odoriferous substances |
-
1947
- 1947-05-09 GB GB12603/47A patent/GB645130A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021073736A1 (en) | 2019-10-16 | 2021-04-22 | Symrise Ag | New aromatic monothioketals as odoriferous substances |
| CN114746407A (en) * | 2019-10-16 | 2022-07-12 | 西姆莱斯股份公司 | Novel aromatic monothiol ketals as odorants |
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