Six-, seven-, nine- and ten-membered rings

Sulfur imides with a single NR functionality, S5NR (6.12), SeNR (6.13) (R = Oct), SgNH (6.14), ° and S9NH (6.15) ° are obtained by a methodology similar to that which has been used for the preparation of unstable sulfur allotropes, e.g., S9 and Sio. Eor example, the metathesis reaction between the bis(cyclopentadienyl)titanium complexes 6.8-6.10 and the appropriate dichlorosulfane yields 6.14 and 6.15 (Eq. 6.4). ° 

The twelve-membered ring SnNH is obtained via the reaction shown in Eq. 6.5. It was characterized by spectroscopic methods (IR, Raman and mass spectra). It is thermally more stable than 6.14 and 6.15, but decomposes to S7NH and Ss after several weeks at 25°C. ° 

The chemistry of this interesting series of cyclic selenium imides, e.g., ligand behaviour, has not been investigated. 

The Inorganic Heterocyclic Chemistry of Sulfur, Nitrogen and Phosphorus, Academic Press, London (1980). 

Brauer, Handbook of Preparative Inorganic Chemistry, 2 Ed., Academic Press, New York, Vol. 1, p.411 (1963). 

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