GB651931A - Improvements in halogen containing derivatives of butadiene sulphone - Google Patents
Improvements in halogen containing derivatives of butadiene sulphoneInfo
- Publication number
- GB651931A GB651931A GB22362/48A GB2236248A GB651931A GB 651931 A GB651931 A GB 651931A GB 22362/48 A GB22362/48 A GB 22362/48A GB 2236248 A GB2236248 A GB 2236248A GB 651931 A GB651931 A GB 651931A
- Authority
- GB
- United Kingdom
- Prior art keywords
- product
- trichlorobromomethane
- dioxide
- peroxide
- trichloromethyl
- 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)
Abstract
3-Bromo-4-trichloromethyl tetrahydro thiophene-1,1-dioxide is obtained by subjecting butadiene sulphone and trichlorobromomethane in the proportion of at least two mols. of trichlorobromomethane to one mol. of butadiene sulphone to the action of either actinic light or a diacyl peroxide at elevated temperature at which the diacyl peroxide is decomposed, until 3 - bromo - 4 - trichloromethyl tetrahydro thiophene-1,1-dioxide is formed and separating said product. The reaction initiator is preferably added in portions throughout the course of the reaction and may be effected at between 50 DEG C. and 120 DEG C. depending on the peroxide used as initiator. The product may be dehydrohalogenated by contacting it with an aqueous solution containing an alkali metal hydroxide to give an unsaturated derivative, 4-dichloromethylene 4,5-dihydro thiophene 1,1-dioxide, and this compound as well as the main product are stated to be useful as insecticides. In examples: (1) butadiene sulphone is added to trichlorobromomethane and a solution of diacetyl peroxide in trichlorobromomethane then added in five equal portions at half-hour intervals, the temperature being maintained at 80-85 DEG C. 3 - Bromo - 4 - trichloromethyl tetrahydro thiophene-1,1-dioxide is obtained; (2) the same product is obtained by placing a solution of butadiene sulphone in trichlorobromomethane in a glass apparatus containing a spiral neon fluorescent lamp. The air is displaced with nitrogen and the light turned on for 12 hours; (3) the product of (1) is dissolved in ethyl alcohol and titrated with potassium hydroxide solution to the colour change using phenolphthalein as indicator. The mixture is filtered and the dehydrohalogenated product obtained from the filtrate. The Specification as open to inspection under Sect. 91 refers to the use of any peroxide compound as reaction initiator. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US651931XA | 1947-10-25 | 1947-10-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB651931A true GB651931A (en) | 1951-04-11 |
Family
ID=22060955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22362/48A Expired GB651931A (en) | 1947-10-25 | 1948-08-25 | Improvements in halogen containing derivatives of butadiene sulphone |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB651931A (en) |
-
1948
- 1948-08-25 GB GB22362/48A patent/GB651931A/en not_active Expired
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