1078-97-3Relevant articles and documents
Siloxane bond formation by heterofunctional condensation of alkoxysilane and halogenosilane. Application to the preparation of copoly(tetramethyl-p-silphenylenesiloxane-dimethylsiloxane)
Corriu, R.J.P.,Leclercq, D.,Mutin, P.H.,Samson, H.,Vioux, A.
, p. 43 - 50 (1994)
Siloxane linkages are formed non-hydrolytically by the reaction of dihalogenosilanes with either dibenzylether, or dibenzyloxysilanes and dibenzhydryloxysilanes.The heterocondensation reaction is activated in the presence of NaI (in acetonitrile) or fluoride anions.This offers an alternative copolymerization route to the usual dehydrocondensation of SiOH-terminated species.Thus, the title copolymer was prepared by reaction of equimolar amounts of Me2Si(OCHPh2)2 and 1,4-bis(chlorodimethylsilyl)benzene at 100 deg C.The 29Si NMR spectrum supports a quasi-random sequence in the copolymer.Thermal stability is similar to that reported for an alternating microstructure, as inferred from thermogravimetric analysis. Key words: Siloxane; Polymer
Synthesis of heteroatomic bridged paracyclophanes
Reuter,Maas,Reuter,Kilgenstein,Asfaha,Von H?nisch
, p. 4530 - 4541 (2017)
Heteroatomic bridged paracyclophanes were obtained by two independent synthetic approaches. The required precursors consist of para R2SiCl (R = Me, iPr) substituted aromatic rings (2 and 4). They were subsequently functionalised by using NH3, [LiPH2(dme)] or LiAl(PH2)4. In the case of the Me-substituted species 2, the reaction with NH3 directly yielded the Si2N bridged paracyclophane 5. The Si2P incorporated derivative 10 was obtained by lithiation of p-C6H4(SiiPr2PH2)2 (9) and subsequent salt metathesis with the chlorosilane 4. The second approach involves the use of GaEt3 in the formation of four membered (GaPn)2 cycles (Pn = N, P). p-[C6H4{SiiPr2N(H)GaEt2}2]2 (11) and p-[C6H4{SiiPr2P(H)GaEt2}2]2 (12) represent the first examples of stable (GaPn)2cis isomers as the trans species did not appear in solution. Although 11 and 12 show a similar coordination pattern, they differ in the orientation of the aromatic systems: in the solid structure, 11 adopts a-for paracyclophanes so far unique-T-shape conformation of the phenyl rings, while 12 shows the predominant coplanar orientation. All cyclophanes were characterized by X-ray diffraction, elemental analysis, NMR and IR spectroscopy.
Silicon phenylene / carbosilane compound and preparation method thereof
-
Paragraph 0010, (2016/10/10)
The present invention relates to the field of organic silicon, and more particularly relates to a silicon phenylene / carbosilane compound and a preparation method thereof. The invention discloses the silicon phenylene / carbosilane compound with the following molecular structural structure, wherein R1 is independently selected from the group consisting of C1-C5 alkyl, substituted alkyl, aryl and substituted aryl, R2 is independently selected from the group consisting of C1-C5 alkyl or substituted alkyl, aryl and alkenyl containing 1-5 carbon atoms, R3 is independently selected from the group consisting of C1-C12 alkyl or substituted alkyl, aryl and C1-C5 vinyl, and n is an integer from 1 to 50.