Chapter 21: Q-21-21-5P (page 688)
Predict the products of the following nucleophilic acyl substitution reactions:
Short Answer
The products of each reaction are as shown below:
Chapter 21: Q-21-21-5P (page 688)
Predict the products of the following nucleophilic acyl substitution reactions:
The products of each reaction are as shown below:
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Get started for freeThe hydrolysis of a biological thioester to the corresponding carboxylate is often more complex than the overall result might suggest. The conversion of succinyl CoA to succinate in the citric acid cycle, for instance, occurs by initial formation of an acyl phosphate, followed by reaction with guanosine diphosphate (GDP, a relative of adenosine diphosphate [ADP]) to give succinate and guanosine triphosphate (GTP, a relative of ATP). Suggest mechanisms for both steps.
Predict the product(s) of the following reactions:
Bacteria typically develop a resistance to penicillins and other ฮฒ-lactam antibiotics (see Something Extra in this chapter) due to bacterial synthesis of ฮฒ -lactamase enzymes. Tazobactam, however, is able to inhibit the activity of the ฮฒ -lactamase by trapping it, thereby preventing a resistance from developing.
(a) The first step in trapping is the reaction of a hydroxyl group on the ฮฒ -lactamase to open the ฮฒ -lactam ring of tazobactam. Show the mechanism.
(b) The second step is opening the sulfur-containing ring in tazobactam to give an acyclic imine intermediate. Show the mechanism.
(c) Cyclization of the imine intermediate gives the trapped ฮฒ-lactamase product. Show the mechanism.
21-30 Electrostatic potential maps of a typical amide (acetamide) and an acyl azide (acetyl azide) are shown. Which of the two do you think is more reactive in nucleophilic acyl substitution reactions? Explain.
21-33 Predict the product(s) and provide the mechanism for each reaction below.
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