primary allylic more stable than tertiary radical?

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Greenvneck

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Yes, it just is that way. It's because of resonance... I'm sure someone else can explain more, but that is correct (at least according to our current theories!)
 
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Hmm this is a good question, one I might have glossed over and missed lol. But looking at it initially I would say there is two ways to approach this problem.

1) With the allylic carbon, you assume any electrons are spread out over C2 and C3 due to resonance (including the electron).
2) try drawing out resonance structures. Two can be drawn for the allylic radical, but with the CC you just have the one.

Hope this helps
 
How about approaching with inductive effect?

Double bond is e- withdrawing (am I right?) and three methyl groups in tertiary radical are e- donating. How does electron withdrawing/e donating work on radicals?

But due to CARDIO, Resonance takes precedence over Inductive effect?
 
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