Bildung siliciumorganischer Verbindungen. 100. Über die Isolierung höherer Carbosilane aus der Pyrolyse des Tetramethylsilans

Formation of Organosilicon Compounds. 100. Isolation of Higher Molecular Carbosilanes from the Pyrolysis Products of Tetramethylsilane A systematic investigation of the carbosilanes containing 6 to 9 Si atoms per molecule formed by pyrolysis of SiMe₄ was achieved by means of column chromatographic separations combined with HPLC. 11 pure compounds and mixtures of the isomers of 7a and 7b as well as of 11 and 15 were isolated. The predominant structure is that of the carborundanes using only Me and H as Si substituents. Only in compounds 8 and 13 some of the Si? C sixmembered rings are in the chair form. In compounds 17 and 18 another possibility of connecting 1,3,5,7-tetrasilaadamantane frameworks to higher molecular carbosilanes is realized.