Organic Chemistry: Principles and Mechanisms (Second Edition)
Organic Chemistry: Principles and Mechanisms (Second Edition)
2nd Edition
ISBN: 9780393663556
Author: Joel Karty
Publisher: W. W. Norton & Company
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Chapter 13, Problem 13.9P
Interpretation Introduction

(a)

Interpretation:

How the given transform would appear in a synthesis is to be shown.

Concept introduction:

A synthetic trap is a synthesis which prevents the reaction from occurring in the forward direction as planned. This occurs mainly because the reactant molecule contains multiple functional groups which interfere in the desired mechanism. However, even when there is only one functional group, a synthetic trap can still arise if a reaction takes place at two or more sites within that functional group. In such cases, regiochemistry is an issue. Regiochemistry is the specific region in the given molecule at which the reaction takes place selectively. We can choose a synthesis according to the regioselectivities of the functional group transformation reactions.

The alkylation at alpha carbon atoms in ketones is regioselective, and we can control the regioselectivity by using appropriate reagents and the sequence in which the reagents are used. The choice of base dictates which alpha carbon undergoes reaction. A very strong base such as LDA leads to alkylation at the less substituted alpha carbon atom whereas a moderately strong base such as tert-butoxide anion leads to alkylation at the more substituted alpha carbon atom. The alkylation occurs using an alkyl halide as an alkylating group.

Interpretation Introduction

(b)

Interpretation:

How the given transform would appear in a synthesis is to be shown.

Concept introduction:

A synthetic trap is a synthesis which prevents the reaction from occurring in the forward direction as planned. This occurs mainly because the reactant molecule contains multiple functional groups which interfere in the desired mechanism. However, even when there is only one functional group, a synthetic trap can still arise if a reaction takes place at two or more sites within that functional group. In such cases, regiochemistry is an issue. Regiochemistry is the specific region in the given molecule at which the reaction takes place selectively. We can choose a synthesis according to the regioselectivities of the functional group transformation reactions.

The alkylation at the alpha carbon atoms in ketones is regioselective, and we can control the regioselectivity using appropriate reagents, and the sequence in which the reagents are used. The choice of base dictates which alpha carbon undergoes a reaction. A very strong base such as LDA leads to alkylation at the less substituted alpha carbon atom. whereas a moderately strong base such as tert-butoxide anion leads to alkylation at the more substituted alpha carbon atom. The alkylation occurs using an alkyl halide as an alkylating group.

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B. Classify the following amino acid. Atoms other than carbon and hydrogen are labeled. a. acidic b. basic C. neutral C. Consider the following image. Which level of protein structure is shown here? a. primary b. secondary c. tertiary d. quaternary D. Consider the following image. H RH H HR H R HR HR RH Which level of protein structure is shown in the box? a. primary b. secondary R c. tertiary d. quaternary コー R
Briefly answer three from the followings: a. What are the four structures of the protein? b. Why is the side chain (R) attached to the alpha carbon in the amino acids is important for the function? c. What are the types of amino acids? And how is it depend on the (R) structure? d. Write a reaction to prepare an amino acid. prod
Answe Answer A and B please
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