M. Wollenweber et al., SYNTHESIS OF SPIROCYCLIC AMINOSILANES WITH ELECTRON-WITHDRAWING SUBSTITUENTS AT NITROGEN, Zeitschrift fur Naturforschung. B, A journal of chemical sciences, 53(2), 1998, pp. 145-148
The first synthesis of spirocyclic tetrasulfonamidosilanes is describe
d. According to the X-Ray structure analysis of the most stable tetrat
osylamidosilane 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 SiN4 tetrahedron.