GB696572A - Improvements in and relating to linear silmethylenesiloxanes - Google Patents
Improvements in and relating to linear silmethylenesiloxanesInfo
- Publication number
- GB696572A GB696572A GB756/49A GB75649A GB696572A GB 696572 A GB696572 A GB 696572A GB 756/49 A GB756/49 A GB 756/49A GB 75649 A GB75649 A GB 75649A GB 696572 A GB696572 A GB 696572A
- Authority
- GB
- United Kingdom
- Prior art keywords
- general formula
- prepared
- hours
- compound
- grignard reagent
- 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
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
- C08G77/48—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms
- C08G77/50—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms by carbon linkages
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
Abstract
Organosiloxanes of the general formula <FORM:0696572/IV (b)/1> wherein m and n are 1, and m is 2 and n is 1, are prepared by reacting monochloromethyl-pentamethyldisiloxane with magnesium, refluxing for 2 1/2 hours the Grignard reagent thus formed with dimethyldichlorosilane dissolved in anhydrous ether, there being at least 2 mols. of Grignard reagent for 1 mol. of the dimethyldichlorosilane, hydrolysing the reaction product and separating the desired organo-siloxanes by fractional distillation. An organosiloxane of the above general formula, wherein m is 1 and n is 2, may be prepared by following the above procedure and allowing the reaction with the Grignard reagent to reflux for 19 hours, fractionally distilling the reaction product to isolate a fraction boiling at 118/130 DEG C. and 52/54 mm. pressure, said fraction being heated under reflux conditions for 3 hours, and then fractionally distilling to isolate the desired product. In example (1), compounds are prepared of the above general formula where m is 1 and n is 1, and where m is 2 and n is 1, and a compound of the formula (CH3)3SiCH2Si(CH3)2 OSi(CH3)3. In example 2, a compound of the above general formula, where m is 1 and n is 2, is prepared, and a compound of the formula (CH3)3SiOSi(CH3)2\t CH2Si(CH3)2OH is also formed.ALSO:Organo-silicon compounds of the general formula-<FORM:0696572/III/1> wherein m and n are 1, m is 2 and n is 1, and m is 1 and n is 2, are used as anti-foaming agents.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US696572XA | 1948-01-22 | 1948-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB696572A true GB696572A (en) | 1953-09-02 |
Family
ID=22090400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB756/49A Expired GB696572A (en) | 1948-01-22 | 1949-01-11 | Improvements in and relating to linear silmethylenesiloxanes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB696572A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3020299A (en) * | 1958-08-15 | 1962-02-06 | Gen Electric | Organosilicon compositions |
| US3167528A (en) * | 1961-07-03 | 1965-01-26 | Gen Electric | Silylarylene compositions |
-
1949
- 1949-01-11 GB GB756/49A patent/GB696572A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3020299A (en) * | 1958-08-15 | 1962-02-06 | Gen Electric | Organosilicon compositions |
| US3167528A (en) * | 1961-07-03 | 1965-01-26 | Gen Electric | Silylarylene compositions |
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