# How does singlet oxygen work in pericyclics?

and heres the diagram for the 1O2 dienophile:

Its the 1E+g the one I'm interested in. I see that its single electrons are in a couple of degenerate pi orbitals. I'm having trouble figuring out what the LUMO is here. Does it even matter that I have 2 LUMOs? I kinda suspect, that would make it much more reactive since unpaired electrons are pretty unstable. Is this oxygen singlet species technically a diradical?

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