I don't understand question 6, although I took notes and the professor mentioned an explanation in class.
Can someone please help using easier terms?
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a) The compound can rotate into a trans configuration that is not suitable for Diels Alder
b) The compound is locked into a cis configuration that is favorable. Furthermore, a carbon group is slightly electron donating
c) The compound has an electron withdrawing group.
What compound is that? It's compounds labelled b) and c)
Comment: Normal demand Diels Alder is enhanced by an electron withdrawing group in the dienophile and an electron donating group in the diene. Look at reaction mechanism tab (http://en.wikipedia.org/wiki/Diels%E2%80%93Alder_reaction)
I am not sure as to why that is. I have forgotten.