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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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Autores principales: Talalaeva, Evgeniya V., Kalinina, Aleksandra A., Chernov, Evgeniy V., Khmelnitskaia, Alina G., Obrezkova, Marina A., Cherkaev, Georgii V., Muzafarov, Aziz M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8747541/
https://www.ncbi.nlm.nih.gov/pubmed/35012055
http://dx.doi.org/10.3390/polym14010028
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author Talalaeva, Evgeniya V.
Kalinina, Aleksandra A.
Chernov, Evgeniy V.
Khmelnitskaia, Alina G.
Obrezkova, Marina A.
Cherkaev, Georgii V.
Muzafarov, Aziz M.
author_facet Talalaeva, Evgeniya V.
Kalinina, Aleksandra A.
Chernov, Evgeniy V.
Khmelnitskaia, Alina G.
Obrezkova, Marina A.
Cherkaev, Georgii V.
Muzafarov, Aziz M.
author_sort Talalaeva, Evgeniya V.
collection PubMed
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.
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spelling pubmed-87475412022-01-11 Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers Talalaeva, Evgeniya V. Kalinina, Aleksandra A. Chernov, Evgeniy V. Khmelnitskaia, Alina G. Obrezkova, Marina A. Cherkaev, Georgii V. Muzafarov, Aziz M. Polymers (Basel) Article 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. MDPI 2021-12-22 /pmc/articles/PMC8747541/ /pubmed/35012055 http://dx.doi.org/10.3390/polym14010028 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Talalaeva, Evgeniya V.
Kalinina, Aleksandra A.
Chernov, Evgeniy V.
Khmelnitskaia, Alina G.
Obrezkova, Marina A.
Cherkaev, Georgii V.
Muzafarov, Aziz M.
Synthesis of 1,1,3,3,5,5-Hexamethyl-7,7-diorganocyclotetrasiloxanes and Its Copolymers
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 Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8747541/
https://www.ncbi.nlm.nih.gov/pubmed/35012055
http://dx.doi.org/10.3390/polym14010028
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