Synthesis and characterization of the stable 1,3-oxazinium olate and 1,3-thiazinium olate

The stable mesoionic 1,3-thiazinium 4-olates or 1,3-oxazinium 4-olates 3 was synthesis via the condensation of (chlorocarbonyl)ketenes 1 with N-substituted amide and thioamide 2 in a fast and simple procedure. The mesoionic 1,3-thiazinium 4-olates or 1,3-oxazinium 4-olates 3 was isolable as a stable compound, which remained unchanged for at least two weeks at room temperature.

Keywords:

1 , 3-thiazinium 4-olates , 1 , 3-oxazinium 4-olates , (chlorocarbonyl)ketenes