Polycyclic amides and silylamides of Ge, Sn, As, Sb and Bi

Abstract

Polycyclic compounds with nitrogen, (silicon, carbon) and metallic main group elements like Ge, Sn, As, Sb and Bi forming the skeleton have been synthesized by two different ways. By a first route the components of the compounds are put together by classical salt elimination reactions while by the second procedure a Lewis acidic center in the molecule (Ge) serves as target for an intramolecular attack of a nitrogen base. If this nitrogen atom has an trimethylsilyl substituent a trimethylsilyl migration to the electronegative end of the Ge=X bond (X=O, N-SiMe3, S) is observed parallel to the Ge-N bond formation; if the nitrogen atom is substituted by tert-butyl, an intramolecularly N-coordinated Ge=X system is isolated as a crystalline compound.