Synthese und Eigenschaften einiger Silylethinylsilane; Molekülstruktur von Tetrakis(trimethylsilylethinyl)silan / Synthesis and Properties of Some Silylethynylsilane; Molecular Structure of Tetrakis(trimethylsilylethynyl)silane

Abstract

Abstract Trimethylsilylethine (1) has been prepared from C 2 H 2 , sodium and Me 3 SiCl in anisole. The product can be converted into a Grignard reagent Me 3 SiC≡CMgCl using iPrMgCl. This reagent yields the compounds Me 3 SiC≡CSiH 3 , (Me 3 SiC≡C) 2 SiH 2 , (Me 3 SiC≡C) 3 SiH, and (Me 3 SiC≡C) 4 Si (2-5) when treated with equivalent amounts of H 3 SiBr, H 2 SiBr 2 , HSiCl 3 , or SiCl 4 . respectively. The new silanes have been characterized by NMR data. The crystal structure of (Me 3 SiC≡C) 4 Si has been determined by single crystal X-ray diffraction. It shows the expected tetrahedral geometry at he central silicon atom with four linear SiC≡CSi linkages.