a) Interpretation: A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown. Concept introduction: The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction. To draw: The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Question

Provide synthetic routes for the preparation of the starting materials of azo dye Alizarine Yellow R starting from benzene O₂N -NEN OH CO₂H

Answer 1

Question

Chapter 16.SE, Problem 45MP

Interpretation Introduction

a)

Interpretation:

A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Interpretation Introduction

b)

Interpretation:

A structure for allura red, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of allura red, an azo dye, produced when the two reactants shown react and to give the electron pushing mechanism for its formation.

Interpretation Introduction

c)

Interpretation:

A structure for lithol rubine BX, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of lithol rubine BX, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

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Provide synthetic routes for the preparation of the starting materials of azo dye Alizarine Yellow R starting from benzene O₂N -NEN OH CO₂H

Compound X, shown below, spontaneously reacts via an intramolecular SN2 to produce intermediate Y, known as an "aziridinium" ion. In the presence of water, intermediate Y reacts further to form product Z. What is the identity of product Z. OH (A) + En Br O (B) aziridinium ion Y OH (C) H₂O + En Z HO

2) a) n-Butyllithium is used to deprotonate the following compounds. Draw the structures of the resulting organolithium compounds (assume they are monomeric). Me₂N SO₂ b) Explain the selectivity of deprotonation. c) Each organolithium is reacted with ethyltosylate. Draw the structures of the resulting products.

Answer 2

Question

Chapter 16.SE, Problem 45MP

Interpretation Introduction

a)

Interpretation:

A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Interpretation Introduction

b)

Interpretation:

A structure for allura red, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of allura red, an azo dye, produced when the two reactants shown react and to give the electron pushing mechanism for its formation.

Interpretation Introduction

c)

Interpretation:

A structure for lithol rubine BX, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of lithol rubine BX, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

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Answer 3

Question

Chapter 16.SE, Problem 45MP

Interpretation Introduction

a)

Interpretation:

A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Interpretation Introduction

b)

Interpretation:

A structure for allura red, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of allura red, an azo dye, produced when the two reactants shown react and to give the electron pushing mechanism for its formation.

Interpretation Introduction

c)

Interpretation:

A structure for lithol rubine BX, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of lithol rubine BX, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Expert Solution & Answer

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Answer 4

Question

Chapter 16.SE, Problem 45MP

Interpretation Introduction

a)

Interpretation:

A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Interpretation Introduction

b)

Interpretation:

A structure for allura red, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of allura red, an azo dye, produced when the two reactants shown react and to give the electron pushing mechanism for its formation.

Interpretation Introduction

c)

Interpretation:

A structure for lithol rubine BX, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of lithol rubine BX, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Expert Solution & Answer

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Answer 5

Chapter 16.SE, Problem 45MP

Interpretation Introduction

a)

Interpretation:

A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Interpretation Introduction

b)

Interpretation:

A structure for allura red, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of allura red, an azo dye, produced when the two reactants shown react and to give the electron pushing mechanism for its formation.

Interpretation Introduction

c)

Interpretation:

A structure for lithol rubine BX, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of lithol rubine BX, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Answer 6

Chapter 16.SE, Problem 45MP

Interpretation Introduction

a)

Interpretation:

A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Answer 7

Chapter 16.SE, Problem 45MP

Interpretation Introduction

a)

Interpretation:

A structure for methyl orange, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and can attack aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of methyl orange, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Answer 8

Interpretation Introduction

b)

Interpretation:

A structure for allura red, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of allura red, an azo dye, produced when the two reactants shown react and to give the electron pushing mechanism for its formation.

Answer 9

Interpretation Introduction

b)

Interpretation:

A structure for allura red, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of allura red, an azo dye, produced when the two reactants shown react and to give the electron pushing mechanism for its formation.

Answer 10

Interpretation Introduction

c)

Interpretation:

A structure for lithol rubine BX, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of lithol rubine BX, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Answer 11

Interpretation Introduction

c)

Interpretation:

A structure for lithol rubine BX, an azo dye, produced when the two reactants shown react is to be drawn and the electron pushing mechanism for its formation is to be shown.

Concept introduction:

The diazonium cation can act as an electrophile and attack the aromatic rings. The dimethylamino group is an o- and p- directing group. Hence the diazonium cation can attack the ring at the p-position to yield a carbocation intermediate. The intermediate then can lose a proton to yield the desired product. This reaction is known as coupling reaction.

To draw:

The structure of lithol rubine BX, an azo dye, produced when the two reactants shown react and to show the electron pushing mechanism for its formation.

Answer 12

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Answer 23

Ch. 16.1 - Prob. 1P Ch. 16.2 - Propose a mechanism for the electrophilic...Ch. 16.2 - How many products might be formed on chlorination...Ch. 16.2 - When benzene is treated with D2SÅª4. deuterium...Ch. 16.3 - Prob. 5P Ch. 16.3 - What is the major monosubstitution product from...Ch. 16.3 - Identify the carboxylic acid chloride that might...Ch. 16.4 - Rank the compounds in each of the following groups...Ch. 16.4 - Predict the major products of the following...Ch. 16.4 - Prob. 10P

Solution Summary: The author explains the structure of methyl orange, an azo dye, produced when the two reactants shown react is drawn and the electron pushing mechanism for its formation.

Chapter 16 Solutions