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1,1,3,3-Tetramethyl-1,3-disilacyclobutane preparation

The ROP of all known saturated SCHs proceeds via the rupture of endocyclic Si-C bonds. In the US patent issued in 1958, the first attempt was made to use a 4-membered SCH for the synthesis of heterochain PCSs [2]. From the late 1950s to the early 1980s, Vdovin and co-workers intensively investigated a new class of polymers - high-molecular-weight heterochain PCSs, prepared by the ROP of 4-membered SCHs - dimethyl-silacyclobutane (MSCB), tetramethyl-disilacyclobutane (DSCB) and their derivatives (see Sects. 1.1 and 1.2). The energy and structural characteristics of silacyclobutanes were analyzed in [3-10]. Though these publications are rather old, their results remain valid up to the present time. [Pg.113]

Tetramethyl-l,3-disilacyclobutane had been prepared earlier by Knoth and Lindsey [10], but a multistep synthesis was involved which was not generalizable to the synthesis of Si-functional 1,3-disilacyclobutanes. The reaction shown in eq. 4, provided it is carried out in the right way, represents a good, general route to 1,3-disilacyclobutanes. This reaction was reported first by Muller and his coworkers [11]. In this work, diethyl ether was used as reaction solvent and the product yield was only around 4%. Somewhat better yields were obtained" by Russian workers [12], but it was the detailed studies of the (chloromethyl)chlorosilane/ magnesium reaction by Kriner [13] which provided a good synthesis of... [Pg.23]

Although the preparative cathodic reduction of halomethylsilanes has not been investigated extensively, Dunogues and coworkers revealed that the electrochemical reduction of (chloromethyl)dimethylchlorosilane with an aluminum cathode afforded polycarbosilanes [92]. l,1.3,3-Tetramethyl-l,3-disilacyclobutane is also formed under these condition (Scheme 43). [Pg.86]

Bromination of tris(dimethylsilyl)methane yielded HC(SiMe2Br)3 (core A). [12] Hydride precursors of carbosilane cores B and C tris[1,1,1-tri(dimethylsilyl)hexy 1-dimethylsilyl]methane HC[SiMe2(CH2)3C(SiMe2H)3]3 and 1,1,3,3-tetramethyl-2,2,4,4-tetrakis-(dimethylsilyl)-l,3-disilacyclobutane [SiMe2C(SiMe2H)j2 were also prepared utilizing HC(SiMe2H)3. [Pg.106]


See other pages where 1,1,3,3-Tetramethyl-1,3-disilacyclobutane preparation is mentioned: [Pg.28]    [Pg.54]    [Pg.103]    [Pg.219]    [Pg.375]    [Pg.5991]   
See also in sourсe #XX -- [ Pg.23 ]




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1,1,3,3-Tetramethyl-1,3-disilacyclobutane

1.2- Disilacyclobutanes

Disilacyclobutane

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