Domanda del libro di testo
Glycine has pKa values of 2.3 and 9.6. Do you expect the pKa values of glycylglycine to be higher or lower than these values?
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Ch. 21 - Amino Acids, Peptides, and Proteins
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds: Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
Capitolo 21, Problema 73
Write the mechanism for the reaction of an amino acid with di-tert-butyl dicarbonate.
Guida verificata passo dopo passo1
Identify the functional groups in the amino acid: The amino acid contains an amine group (-NH2) and a carboxylic acid group (-COOH). The reaction will involve the amine group reacting with di-tert-butyl dicarbonate (Boc2O).
Understand the role of di-tert-butyl dicarbonate: Boc2O is a reagent used to protect the amine group by converting it into a Boc-protected amine. This reaction prevents the amine group from participating in further reactions.
Initiate the reaction: The lone pair of electrons on the nitrogen atom in the amine group attacks one of the carbonyl carbons in Boc2O. This is a nucleophilic attack, as the nitrogen acts as a nucleophile and the carbonyl carbon is electrophilic.
Form the tetrahedral intermediate: The nucleophilic attack results in the formation of a tetrahedral intermediate. One of the tert-butyl carbonate groups is displaced as a leaving group during this step.
Complete the reaction: The intermediate collapses, leading to the formation of the Boc-protected amine. The final product is the amino acid with its amine group protected as an N-Boc derivative, and tert-butanol is released as a byproduct.
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Amino Acid Structure
Amino acids are organic compounds that serve as the building blocks of proteins. They consist of a central carbon atom bonded to an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom, and a variable R group that determines the specific properties of each amino acid. Understanding the structure of amino acids is crucial for analyzing their reactivity and interactions with other chemical species.
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7:19
Charged Amino Acids
Protecting Groups in Organic Synthesis
Protecting groups are temporary modifications used in organic synthesis to prevent certain functional groups from reacting during a chemical reaction. In the case of di-tert-butyl dicarbonate (Boc2O), it acts as a protecting group for the amino group of an amino acid, allowing for selective reactions without interference from the amine. This concept is essential for controlling the reactivity of functional groups in complex organic transformations.
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02:44Protecting Groups
Mechanism of Nucleophilic Acyl Substitution
The reaction between an amino acid and di-tert-butyl dicarbonate involves nucleophilic acyl substitution, where the nucleophilic amino group attacks the electrophilic carbonyl carbon of the dicarbonate. This mechanism typically includes the formation of a tetrahedral intermediate, followed by the elimination of a leaving group. Understanding this mechanism is vital for predicting the outcome of the reaction and the stability of the resulting products.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Pratica correlata
Domanda del libro di testo
α-Amino acids can be prepared by treating an aldehyde with ammonia/trace acid, followed by hydrogen cyanide, followed by acid-catalyzed hydrolysis.
b. What amino acid is formed when the aldehyde that is used is 3-methylbutanal?
c. What aldehyde is needed to prepare isoleucine?
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Domanda del libro di testo
Show how valine can be prepared by
c. a reductive amination.
1147
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Domanda del libro di testo
Reaction of a polypeptide with carboxypeptidase A releases Met. The polypeptide undergoes partial hydrolysis to give the following peptides. What is the sequence of the polypeptide?
1. Ser, Lys, Trp
2. Gly, His, Ala
3. Glu, Val, Ser
4. Leu, Glu, Ser
5. Met, Ala, Gly
6. Ser, Lys, Val
7. Glu, His
8. Leu, Lys, Trp
9. Lys, Ser
10. Glu, His, Val
11. Trp, Leu, Glu
12. Ala, Met
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Domanda del libro di testo
Dithiothreitol reacts with disulfide bridges in the same way that 2-mercaptoethanol does. With dithiothreitol, however, the equilibrium lies much more to the right. Explain.
959
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Domanda del libro di testo
Show how valine can be prepared by
a. a Hell–Volhard–Zelinski reaction.
1141
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