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How does singlet oxygen work in pericyclics? 
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#1
Oct2213, 08:55 AM

P: 149

and heres the diagram for the ^{1O2} dienophile: Its the ^{1}E^{+}_{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? 


#2
Oct2213, 09:59 AM

Sci Advisor
P: 3,593

The MO diagram for singlet oxygen from wikipedia is not quite correct insofar as it is not a pi_x or pi_y orbital which is doubly occupied in singlet oxygen but rather a ##\pi^*_\pm=\frac{1}{\sqrt{2}}(\pi^*_x\pm i\pi^*_y)## orbital.
So let's say that the ##\pi^*_+## is doubly occupied, then the ##\pi^*_## is the LUMO. 


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