Beiträge zur Chemie der Silicium-Stickstoff-Verbindungen. CV. Ringschlußreaktionen mit 1,5-Bis(alkylamino)trisildioxanen

1.5-Bis(methylamino)hexamethyltrisildioxane reacts in the presence of triethylamine easily with germanium tetrachloride (equ. 1) and ethyldichlorophosphine (equ.2) to give the formerly unknown inorganic eightmembered ring systems Si₃GeN₂O₂ and Si₃PN₂O₂. Respectively. By analogous reacting of silicon tetrachloride only open chained Cl₃Si? Nme? Sime₂? O? Sime₂? O? Sime? NHme (IV; equ. 3) is formed. With metallated 1.5-bis(alkylamino)trisildioxanes, dischlorodiorganylsilanes do not give the expected asymmetric-, but the symmetric cyclotetrasildioxdiazanes V–VII. Dichlorophenylborane, in an analogous reaction, leads to the novel eightmembered ring system BSi₃N₂O₂, but the exact position of the N and O atoms in the ring could not be fixed beyond any doubt. The novel sixmembered ring system BSi₂Ni₂O was realized in compound IX via equ. (6).