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The first synthesis of spirocyclic tetrasulfonamidosilanes is described. According to the X-Ray structure analysis of the most stable tetratosylamidosilane obtained the Silicon is bonded to four Nitrogen atoms in a spirocycle and surrounded by four Oxygen atoms which are located above the planes of the SiN 4  tetrahedron.

Synthesis of Spirocyclic Aminosilanes with Electron Withdrawing Substituents at Nitrogen