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The formerly unknown spiro systems C-F (Scheme I) with silicon in the spiral center and C, Si, N and O in the framework were synthesized via reactions 2-6 and confirmed in their structure by elemental analysis and spectroscopic data (Table I).

Neue Silaza-und Silaoxaza-spiro[4.4]nonane und [4.5]decane / Novel Silaza-and Silaoxaza-spiro[4,4]nonanes and [4,5]decanes