Synthesis and Molecular Structure of Silylated Ethenes and Acetylenes

Abstract

, By varying their stoichiometry these compounds can be used as single source feedstock gases for layers with tailor-made composition. In a new approach to the epitaxial deposition of silicon carbide, halogencontaining feedstock gases are expected to show improved properties owing to a greater reversi bility of the deposition process. W hereas polysilylalkanes halogenated at carbon are well rep resented in the literature [1 0 , 1 1 ], only limited information is available on the corresponding alkenes. The low thermal stability of polysilylated haloalkanes makes these compounds unsuitable for practical processes. The ethene analogues are expected to exhibit greater thermal stability and to be more amenable regarding storage and con * Reprint requests to Prof. Dr. H. Schmidbaur. tinuous handling. Although several sterically crowded polysilyl ethenes have been the subject of investigations of their molecular structure, dy namics and energy characteristics [12][13][14][15][16], the num ber of structurally characterized compounds is still small. Following work on silylalkanes, our more recent studies have therefore focused on silyl olefines. In the course of these investigations we have undertaken the X-ray structure determ i nations of bis(trichlorosilyl)acetylene and of the two most crowded trichlorosilylethenes, tris(trichlorosilyl)ethene and tetrakis(trichlorosilyl)-ethene.

Silylation of triacylglycerol: an easy route to new biosiloxanes

“…These reactions could be extended to trichlorosilyltriflate (Rüdinger et al, 1994)) leading to halosilyl adducts as sources of new siloxanes.…”

Experimental and Theoretical Study of [2σ + 2σ + 2π]–Cycloaddition of Quadricyclane and Ethylenes Containing Three Silyl-Groups

“…Methylation of product 14 under these conditions was indeed successful and resulted in a desirable tricyclononene containing three bulky Me 3 Si-groups (20) in a good yield without by-products formation.…”

“…Diethyl ether (Alfa Aesar), and di-n-butyl ether (Alfa Aesar) were distilled sequentially from potassium hydroxide, sodium metal and sodium with benzophenone. Ethylenes 1-8 were synthesized according to the published procedures [19,20]. Cyclopentadiene-1,3 was used as freshly cracked dicyclopentadiene (Sigma Aldrich).…”

Chlorsiliconorganic Compound Formed during Lipid Separation from Japan Marine Ascidia

“…In the literature we have met works on synthesis of structures of chlorsilicon organic compounds: HC 2 Si 3 Cl 3 , H 3 C 2 Si 3 Cl 9 , C 2 Si 4 Cl 12 [14]. There are also works on synthesis of more simple structures, silagraphen, SiC 2 [15] and chlorographen, Si 2 Cl 6 [16].…”