Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers
This paper reports a method for the synthesis of 1,1,3,3,5,5-hexamethyl-7,7-diorganocyclotetrasiloxanes by the interaction of 1,5-disodiumoxyhexamethylsiloxane with dichlorodiorganosilanes such as methyl-, methylvinyl-, methylphenyl-, diphenyl- and diethyl dichlorosilanes. Depending on the reaction...
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| Format: | Article |
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MDPI AG
2021-12-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/14/1/28 |
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| author | Evgeniya V. Talalaeva Aleksandra A. Kalinina Evgeniy V. Chernov Alina G. Khmelnitskaia Marina A. Obrezkova Georgii V. Cherkaev Aziz M. Muzafarov |
| author_facet | Evgeniya V. Talalaeva Aleksandra A. Kalinina Evgeniy V. Chernov Alina G. Khmelnitskaia Marina A. Obrezkova Georgii V. Cherkaev Aziz M. Muzafarov |
| author_sort | Evgeniya V. Talalaeva |
| collection | DOAJ |
| description | This paper reports a method for the synthesis of 1,1,3,3,5,5-hexamethyl-7,7-diorganocyclotetrasiloxanes by the interaction of 1,5-disodiumoxyhexamethylsiloxane with dichlorodiorganosilanes such as methyl-, methylvinyl-, methylphenyl-, diphenyl- and diethyl dichlorosilanes. Depending on the reaction conditions, the preparative yield of the target cyclotetrasiloxanes is 55–75%. Along with mixed cyclotetrasiloxanes, the proposed method leads to the formation of polymers with regular alternation of diorganosylil and dimethylsylil units. For example, in the case of dichlorodiethylsilane, 70% content of linear poly(diethyl)dimethylsiloxanes with regular alternation of units can be achieved in the reaction product. Using 7,7-diethyl-1,1,3,3,5,5-hexamethylcyclotetrasiloxane as an example, the prospects of the mixed cycle in copolymer preparation in comparison with the copolymerization of octamethyl- and octaethylcyclotetrasiloxanes are shown. |
| first_indexed | 2024-03-10T03:26:09Z |
| format | Article |
| id | doaj.art-83245d686b8e47a89356ed7f3f40eb18 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T03:26:09Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-83245d686b8e47a89356ed7f3f40eb182023-11-23T12:08:48ZengMDPI AGPolymers2073-43602021-12-011412810.3390/polym14010028Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its CopolymersEvgeniya V. Talalaeva0Aleksandra A. Kalinina1Evgeniy V. Chernov2Alina G. Khmelnitskaia3Marina A. Obrezkova4Georgii V. Cherkaev5Aziz M. Muzafarov6Enikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences (ISPM RAS), Profsoyuznaya 70, 117393 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences (ISPM RAS), Profsoyuznaya 70, 117393 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences (ISPM RAS), Profsoyuznaya 70, 117393 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences (ISPM RAS), Profsoyuznaya 70, 117393 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences (ISPM RAS), Profsoyuznaya 70, 117393 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences (ISPM RAS), Profsoyuznaya 70, 117393 Moscow, RussiaEnikolopov Institute of Synthetic Polymeric Materials Russian Academy of Sciences (ISPM RAS), Profsoyuznaya 70, 117393 Moscow, RussiaThis paper reports a method for the synthesis of 1,1,3,3,5,5-hexamethyl-7,7-diorganocyclotetrasiloxanes by the interaction of 1,5-disodiumoxyhexamethylsiloxane with dichlorodiorganosilanes such as methyl-, methylvinyl-, methylphenyl-, diphenyl- and diethyl dichlorosilanes. Depending on the reaction conditions, the preparative yield of the target cyclotetrasiloxanes is 55–75%. Along with mixed cyclotetrasiloxanes, the proposed method leads to the formation of polymers with regular alternation of diorganosylil and dimethylsylil units. For example, in the case of dichlorodiethylsilane, 70% content of linear poly(diethyl)dimethylsiloxanes with regular alternation of units can be achieved in the reaction product. Using 7,7-diethyl-1,1,3,3,5,5-hexamethylcyclotetrasiloxane as an example, the prospects of the mixed cycle in copolymer preparation in comparison with the copolymerization of octamethyl- and octaethylcyclotetrasiloxanes are shown.https://www.mdpi.com/2073-4360/14/1/28mixed cyclosiloxanes1,1,3,3,5,5,7-heptamethyl-7-vinylcyclotetrasiloxane7-hydro-1,1,3,3,5,5,7-heptamethylcyclotetrasiloxane1,1,3,3,5,5,7-heptamethyl-7-phenylcyclotetrasiloxanes7,7-diethyl-1,1,3,3,5,5-hexamethylcyclotetrasiloxane1,1,3,3,5,5-hexamethyl-7,7-diphenylcyclotetrasiloxane |
| spellingShingle | Evgeniya V. Talalaeva Aleksandra A. Kalinina Evgeniy V. Chernov Alina G. Khmelnitskaia Marina A. Obrezkova Georgii V. Cherkaev Aziz M. Muzafarov Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers Polymers mixed cyclosiloxanes 1,1,3,3,5,5,7-heptamethyl-7-vinylcyclotetrasiloxane 7-hydro-1,1,3,3,5,5,7-heptamethylcyclotetrasiloxane 1,1,3,3,5,5,7-heptamethyl-7-phenylcyclotetrasiloxanes 7,7-diethyl-1,1,3,3,5,5-hexamethylcyclotetrasiloxane 1,1,3,3,5,5-hexamethyl-7,7-diphenylcyclotetrasiloxane |
| title | Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers |
| title_full | Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers |
| title_fullStr | Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers |
| title_full_unstemmed | Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers |
| title_short | Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers |
| title_sort | synthesis of 1 1 3 3 5 5 hexamethyl 7 7 diorganocyclotetrasiloxanes and its copolymers |
| topic | mixed cyclosiloxanes 1,1,3,3,5,5,7-heptamethyl-7-vinylcyclotetrasiloxane 7-hydro-1,1,3,3,5,5,7-heptamethylcyclotetrasiloxane 1,1,3,3,5,5,7-heptamethyl-7-phenylcyclotetrasiloxanes 7,7-diethyl-1,1,3,3,5,5-hexamethylcyclotetrasiloxane 1,1,3,3,5,5-hexamethyl-7,7-diphenylcyclotetrasiloxane |
| url | https://www.mdpi.com/2073-4360/14/1/28 |
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