EBK ORGANIC CHEMISTRY
EBK ORGANIC CHEMISTRY
8th Edition
ISBN: 8220102744127
Author: Bruice
Publisher: PEARSON
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Chapter 22.7, Problem 13P
Interpretation Introduction

Interpretation: The result of 18O labelled water hydrolysis of aspirin when the ortho-carboxy substituent acts as an intramolecular general-base catalyst and as an intramolecular nucleophilic catalyst has to be given.

Concept introduction:

Catalyst: Substance which helps in increasing the rate of a particular reaction without getting consumed in the reaction.

Intramolecular catalysis: A catalysis where catalyst is a part of the molecule that undergoes the reaction promotes the reaction in a species.

Intramolecular nucleophilic catalysis: A catalysis where catalyst is a part of the molecule that undergoes the reaction promotes the reaction in a species by acting as a nucleophile.

Intramolecular general-base catalysis: A catalysis where catalyst is a part of the molecule that undergoes the reaction promotes the reaction in a species by completely removing a proton during the slow step in a reaction.

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Whether the ortho-carboxy substituent acts as an intramolecular general-base catalyst or as an intramolecular nucleophilic catalyst can be determined by carrying out the hydrolysis of aspirin with 18O-labeled water and determining whether 18O is incorporated into ortho-carboxy-substituted phenol. Explain the results that would be obtained with the two types of catalysis.
Propanal and propanone react in a similar way with acidified aqueous potassium cyanide, KCN.  For this reaction to occur reasonably quickly, the pH of the solution should be approximately 4. The reaction of propanal proceeds with acidified potassium cyanide proceeds more rapidly than that of propanone. Referring to the mechanism of the reactions, explain this phenomenon.
Write the reactions between acetone and phenol (molar ratio 2:1) in acid catalysis.

Chapter 22 Solutions

EBK ORGANIC CHEMISTRY

Ch. 22.9 - Which of the following amino acid side chains can...Ch. 22.9 - Which of the following C-terminal peptide bonds is...Ch. 22.9 - Carboxypeptidase A has esterase activity as well...Ch. 22.10 - Arginine and lysine side chains fit into trypsins...Ch. 22.10 - Explain why serine proteases do not catalyze...Ch. 22.11 - If H2 18O is used in the hydrolysis reaction...Ch. 22.11 - Draw the pH-activity profile for an enzyme that...Ch. 22.12 - The pHactivity profile for glucose-6-phosphate...Ch. 22.12 - Prob. 23PCh. 22.13 - Draw the mechanism for the hydroxide ion-catalyzed...Ch. 22.13 - What advantage does the enzyme gain by forming an...Ch. 22.13 - Prob. 26PCh. 22.13 - Prob. 27PCh. 22.13 - Aldolase shows no activity if it is incubated with...Ch. 22 - Which of the following parameters would be...Ch. 22 - Prob. 29PCh. 22 - Prob. 30PCh. 22 - Prob. 31PCh. 22 - Indicate the type of catalysis that is occurring...Ch. 22 - The deuterium kinetic isotope effect (KH2O/KD2O)...Ch. 22 - Prob. 34PCh. 22 - Co2+ catalyzes the hydrolysis of the lactam shown...Ch. 22 - there are two kinds of aldolases. Class I...Ch. 22 - Prob. 37PCh. 22 - The hydrolysis of the ester shown here is...Ch. 22 - Prob. 39PCh. 22 - At pH = 12, the rate of hydrolysis of ester A is...Ch. 22 - 2-Acetoxycyclohexyl tosylate reacts with acetate...Ch. 22 - Proof that an imine was formed between aldolase...Ch. 22 - Prob. 43PCh. 22 - a. Explain why the alkyl halide shown here reacts...Ch. 22 - Triosephosphate isomerase (TIM) catalyzes the...
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