Chapter 22: Q32E (page 752)
Treatment of a cyclic ketone with diazomethane is a method for accomplishing a ring-expansion reaction.For example, treatment of cyclohexanone with diazomethane yields cycloheptanone. Propose a mechanism.

Short Answer

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Chapter 22: Q32E (page 752)
Treatment of a cyclic ketone with diazomethane is a method for accomplishing a ring-expansion reaction.For example, treatment of cyclohexanone with diazomethane yields cycloheptanone. Propose a mechanism.


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Unlike most β-diketones, the following β-diketone has no detectable enol content and is about as acidic as acetone. Explain.

Draw a resonance structure of the acetonitrileanion,
andaccount for the acidity of nitriles.
In the Hell–Volhard–Zelinskii reaction, only a catalytic amount of PBr3 is necessary because of the equilibrium below. Review the mechanism for the reaction of a carboxylic acid with thionyl chloride and propose a mechanism for the equilibrium.

For each reaction below, give the corresponding keto/enol tautomer and provide the complete mechanism.

Show how you might prepare the following compounds using an alkylation reaction as the key step:

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