EBK ESSENTIAL ORGANIC CHEMISTRY
3rd Edition
ISBN: 9780100659469
Author: Bruice
Publisher: YUZU
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Textbook Question
Chapter 18, Problem 40P
Trisephosphate isomerase (TIM) catalyzes the conversion of dihydroxyacetone phosphate to glyceraldehydes-3-phosphate. The enzyme’s catalytic groups are Giu 165 and His 95. In the first step of the reaction, these catalytic groups function as a base and an acid catalyst, respectively. Propose a mechanism for the reaction.
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States of Matter
Using a phase diagram to find a phase transition temperature or pressure
Use the phase diagram of Substance X below to find the temperature at which X turns to a gas, if the pressure above the solid is 3.7 atm.
pressure (atm)
0.
32-
16
solid
liquid
gas
200
temperature (K)
Note: your answer must be within 20 °C of the exact answer to be graded correct.
Дос
X
Consider the reaction below to answer the following questions:
Acetoacetic ester can be prepared by the Claisen self-condensation reaction of ethyl acetate.
1. NaOEt, EtOH
H&C
OCH CH3 2 H30
H3C
CH2
OCH2CH3
A. Write the complete stepwise mechanism for this reaction. Show all electron flow with arrows and
draw all intermediate structures.
B. Ethyl acetate can be prepared from ethanol as the only organic starting material. Show all reagents
and structures for all intermediates in this preparation.
C. Give the structures of the ester precursors for the following Claisen condensation product and
formulate the reaction.
OEt
Use the phase diagram of Substance X below to find the temperature at which X turns to a gas, if the pressure above the solid is 3.7 atm.
pressure (atm)
32
16
solid
liquid
gas
0
0
200
temperature (K)
Note: your answer must be within 20 °C of the exact answer to be graded correct.
Шос
☑
ك
Chapter 18 Solutions
EBK ESSENTIAL ORGANIC CHEMISTRY
Ch. 18.1 - Prob. 1PCh. 18.2 - If H218O were used to hydrolyze lysozyme, which...Ch. 18.3 - Which of the following amino acid side chains can...Ch. 18.3 - Arginine and lysine side chains fit into trypsins...Ch. 18.4 - Which of the following amino acid side chains can...Ch. 18.4 - Prob. 6PCh. 18.5 - Prob. 7PCh. 18.5 - Draw the mechanism for the hydroxide-ion-catalyzed...Ch. 18.5 - What advantage does the enzyme gain by forming an...Ch. 18.7 - Prob. 10P
Ch. 18.7 - Prob. 11PCh. 18.8 - How many conjugated double bonds are there in a....Ch. 18.8 - Instead of adding to the 4a-position and...Ch. 18.8 - In succinate dehydrogenase, FAD is covalently...Ch. 18.8 - Prob. 15PCh. 18.9 - Acetolactate synthase is another TPP-requiring...Ch. 18.9 - Acetolactate synthase can also transfer the acyl...Ch. 18.9 - Prob. 18PCh. 18.9 - Prob. 19PCh. 18.10 - Prob. 21PCh. 18.11 - Prob. 23PCh. 18.11 - Which compound is more easily decarboxylated?Ch. 18.11 - Explain why the ability of PLP to catalyze an...Ch. 18.11 - Explain why the ability of PLP to catalyze an...Ch. 18.12 - What groups are interchanged in the following...Ch. 18.13 - Why is the coenzyme called tetrahydrofolate?Ch. 18.13 - What amino acid is formed by the following...Ch. 18.13 - How do the structures of tetrahydrofolate and...Ch. 18.13 - What is the source of the methyl group in...Ch. 18 - Prob. 32PCh. 18 - Prob. 33PCh. 18 - From what vitamins are the following coenzymes...Ch. 18 - Prob. 35PCh. 18 - For each of the following reaction, name both the...Ch. 18 - Explain why serine proteases do not catalyze...Ch. 18 - Prob. 38PCh. 18 - For each of the following enzyme catalyzed...Ch. 18 - Trisephosphate isomerase (TIM) catalyzes the...Ch. 18 - Prob. 41PCh. 18 - What acyl groups have we seen transferred by...Ch. 18 - When UMP is dissolved in T2O, exchange of T for H...Ch. 18 - Prob. 44PCh. 18 - When transaminated, the three branched-chain amino...Ch. 18 - Aldolase shows no activity if it is incubated with...
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