Chalcogen-onium Imides

The pyramidal inversion energies of chalcogen-onium imides were estimated by MO calculations.28 The values for model compounds, dimethyl chalcogen-onium imides, were evaluated to be 34, 44, and 54 kcal mol-1 for S, Se, and Te, respectively, indicating that among the chalcogen-onium imides, telluronium imides are those that are most stable toward pyramidal inversion. 

---