1,4-nucleophilic addition vs. 1,2-nucleophilic additions

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lDanny

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Hi,

Just wondering if I got this straight. 1,2-nucleophilic additions is when the Nu attacks the carbonyl. 1,4-nucleophilic additions is when Nu attacks the conjugated end carbon, like in a Michael reaction.

Doesn't 1,2 need a conj. system? Why does the Nu in the Michael rxn attack the beta carbon instead of the carbonyl? Is it because the beta carbon is resonance stablized? Thanks.

I think I need a sleep, all of these concepts are getting mixed up in my head..lol (2:30am).

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