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.
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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Get started for freeThe major product formed by intramolecular aldol cyclization of 2,5-heptanedione (Problem 23-51) has two singlet absorptions in the 1H NMR spectrum, at 1.65 d and 1.90 d, and has no absorptions in the range 3 to 10 d. What is its structure?
What product would you obtain from a base-catalyzed Michael reaction of 2,4-pentanedione with each of the following ฮฑ-ฮฒ unsaturated acceptors?
(a) 2-Cyclohexenone
(b) Propenenitrile
(c) Ethyl 2-butenoate.
Which of the following compounds can probably be prepared by a mixed aldol reaction? Show the reactants you would use in each case.
Intramolecular aldol cyclization of 2,5-heptanedione with aqueous NaOH yields a mixture of two enone products in the approximate ratio 9;1. Write their structures, and show how each is formed.
The third and fourth steps in the synthesis of Hagemannโs ester from ethyl acetoacetate and formaldehyde (Problem 23-71) are an intramolecular aldol cyclization to yield a substituted cyclohexenone, and a decarboxylation reaction. Write both reactions, and show the products of each step.
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