1070-76-4Relevant academic research and scientific papers
Silylenes of the elemental composition C2H4Si2: Generation and matrix-spectroscopic identification
Maier, Guenther,Reisenauer, Hans Peter,Meudt, Andreas
, p. 1291 - 1295 (2007/10/03)
Pulsed flash pyrolysis in combination with matrix isolation of three precursor molecules (10, 11, 12) led to the formation of silylsilacyclopropenylidene (1), which was identified by comparison of experimental and calculated (BLYP/6-31G*) IR spectra for both, unlabeled 1 and its perdeuterated isotopomer. Upon irradiation of matrix-isolated silylsilacyclopropenylidene (1) a second C2H4Si2 isomer, namely (silylethynyl)silylene (4) was formed. However, no evidence could be found for the formation of disilatetrahedrane or 1,2-or 1,3-disilacyclobutadiene.
Synthesis and Molecular Structure of Silylated Ethenes and Acetylenes
Ruedinger, Christoph,Beruda, Holger,Schmidbaur, Hubert
, p. 1348 - 1360 (2007/10/02)
Disilylacetylene (1) has been obtained from LiAlH4 reduction of bis(trichlorosilyl)acetylene (2) and bisacetylene (4).The catalytic hydrosilylation of 2 with HSiCl3 affords tris(trichlorosilyl)ethene (5) and 1,1,2-tris(trichlorosilyl)ethane (6).The synthesis of 6, trans-bis(trichlorosilyl)ethene (8) and 1,1-bis(trichlorosilyl)ethene (9) has been accomplished by hydrosilylation of trichlorosilylacetylene (7) which was synthesized by the reaction of trichloro(trifluoromethylsulfonyloxy)silane with sodium acetylide.Reductive elimination of halogen from 1,1,1,2-tetrachloro-bis(trichlorosilyl)ethane (10) and 1,2-dibromo-1,1-bis(trichlorosilyl)ethane (13) gave the corresponding ethenes 1,1-dichloro-bis-(trichlorosilyl)ethene (11), trichloro-trichlorosilylethene (12), 1,1-bis(trichlorosilyl)ethene (9) and 1-chloro-2,2-bis(trichlorosilyl)ethene (14).Tetrakis(trichlorosilyl)ethene (15) has been obtained in a three step synthesis starting from chloromethyl-trichlorosilane or dichloromethyl-trichlorosilane.By LiAlH4 reduction of trichlorosilylethenes under various reaction conditions, the silylethenes trans-dichloro-di(silyl)ethene (16), 1,1-dichloro-di(silyl)ethene (17), trichloro-silylethene (18), 1-bromo-1-silylethene (19), trans-di(silyl)ethene (20), 1-chloro-2,2-di(silyl)ethene (21), tri(silyl)ethene (22), and 1,1,2-tri(silyl)ethane (23) could be generated.Silylethyne and silyl-chloroethyne were identified as side products.The crystal and molecular structures of 2, 5 and 15 have been determined by single crystal X-ray diffraction. 2 and 5 crystallize from the melt in the monoclinic space groups Cc and P21/n, respectively. 15 has been crystallized by sublimation (orthorhombic, space group Pbca). 5 and 15 feature strongly distorted ethene skeletons with a double bond twist of 28.1 deg in 15. - Keywords: Silanes, Trichlorosilanes, Polysilylethenes, Carbon Halogenated Silylolefines
