[kortex]

If it's fully unsaturated, 1,4-oxazinane. If it's 2 double bonds, 1,4-oxazine, or more commonly oxazinone if it's part of a larger fused structure (eg nile red). If you fully aromatize it, it becomes oxazinium. That's a weird one, probably unstable. I think there are some peroxo species with a 1,4-oxazin-1-ium but it's a bit wacky.

The meta (1,3) oxazinium is more stable, but it still needs 3 big electron-withdrawing groups to stabilize it in the case of 2,4,6-Triphenyl-1,3-oxazine-1-ium.

https://en.m.wikipedia.org/wiki/Oxazines

https://chemdrawdirect.perkinelmer.cloud/js/sample/index.htm...

[ncmncm]

Thank you. I was looking at a vermicide that had what looked like a complicated nitrogen cage, empty, with a pair of those hanging off, and I realized I had no idea what to call them.