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This is page 61 of the EK Ochem lecture book.
I think the books is wrong (or just very poorly written) but I wanted to make sure with other people. The paragraph says:
The electron withdrawing carbonyl group pulls electrons from the carbon-carbon double bond and makes the beta carbon less susceptible to attack by a nucleophile (electrophilic addition). Thus, rather than the nucleophile adding to the beta carbon it may sometime add to the oxygen atom, forming the enol-keto tautomers.
This picture is what they have directly below the paragraph but the nucleophile doesn't add to the oxygen.
The next picture (I didn't feel like taking 10 minutes to draw it) comes after a paragraph that says that the nucleophile also adds to the alpha carbon often. Except the reaction picture that follows doesn't show this. It just shows what happens if you add the nucleophile first, then the electrophile (H+). Picture still shows the nucleophile being added to the beta carbon.
I think the books is wrong (or just very poorly written) but I wanted to make sure with other people. The paragraph says:
The electron withdrawing carbonyl group pulls electrons from the carbon-carbon double bond and makes the beta carbon less susceptible to attack by a nucleophile (electrophilic addition). Thus, rather than the nucleophile adding to the beta carbon it may sometime add to the oxygen atom, forming the enol-keto tautomers.
This picture is what they have directly below the paragraph but the nucleophile doesn't add to the oxygen.
The next picture (I didn't feel like taking 10 minutes to draw it) comes after a paragraph that says that the nucleophile also adds to the alpha carbon often. Except the reaction picture that follows doesn't show this. It just shows what happens if you add the nucleophile first, then the electrophile (H+). Picture still shows the nucleophile being added to the beta carbon.