Chapter 23: Q34E (page 783)
Leucine, one of the twenty amino acids found in proteins, is metabolized by a pathway that includes the following step. Propose a mechanism.

Short Answer
The leucine is metabolized by the given pathway.
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Chapter 23: Q34E (page 783)
Leucine, one of the twenty amino acids found in proteins, is metabolized by a pathway that includes the following step. Propose a mechanism.

The leucine is metabolized by the given pathway.
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The following reaction involves two successive intramolecular Michael reactions. Write both steps, and show their mechanisms.

What product would you expect to obtain from the base treatment of 1,6-cyclo-decanedione?
What condensation products would you expect to obtain by treatment of the following substances with sodium ethoxide in ethanol?
(a)Ethyl butanoate
(b)Cycloheptanone
(c)3,7-Nonanedione
(d)3-Phenylpropanal
Dieckmann cyclization of diethyl 3-methylheptanedioate gives a mixture of two饾泝-keto ester products. What are their structures, and why is a mixture formed?
In the mixed Claisen reaction of cyclopentanone with ethyl format, a much higher yield of the desired product is obtained by first mixing the two carbonyl components and then adding a base, rather than by first mixing base with cyclopentanone and then adding ethyl format. Explain.
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