Abstract
Spirocyclic pseudosilatranes have been prepared from the condensation of (HOCH 2CH 2) 2NMe with dihydrophenazasilines or by alcohol exchange with dialkoxyphenazasilines. The structures have been investigated in solution by 1H, 13C and 29Si NMR spectroscopy and in the solid state by X-ray diffraction. The interatomic Si⋯N distance in the 1,3-dioxa-6-aza-2-silacyclooctane ring in two 5-methyl-2,8-dioxa-5-aza-1-silacyclooctane-1- spiro-(2,8-dibromo-5-alkyl-10-silaphenzasiline) derivatives is 2.968 and 2.986 Å which indicates a weak nitrogensilicon interaction such as might occur in an intermediate stage of nucleophilic substitution at tetrahedral silicon. The solution data support an equilibrium between a boat—boat conformation (closed form with presumed pentacoordinate Si) and the chair—chair conformation (open form, tetrahedral Si). The spirocyclic pseudosilatranes and related acyclic pseudosilatranes are compared.
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