The various resonances corresponding to 1 H NMR of hydrogen nuclei found in 1-bromohexane should be assigned. Concept introduction: The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen. The area within each peak corresponds to the number of equivalent protons found at that chemical shift values. Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1 H NMR spectra is as follows: Number of peaks = N + 1 Where, N is the number of equivalent protons on the adjacent carbon atoms. Thus if a fragment is − CH 2 − CH 3 − then it would show a three proton triplet due to CH 3 and a two proton quartet in accordance with N + 1 the rule.

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Answer 1

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Chapter 10.5, Problem 18E

(a)

Interpretation Introduction

Interpretation: The various resonances corresponding to 1H NMR of hydrogen nuclei found in 1-bromohexane should be assigned.

Concept introduction:The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen.

The area within each peak corresponds to the number of equivalent protons found at that chemical shift values.

Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1H NMR spectra is as follows:

Number of peaks=N+1

Where,

N is the number of equivalent protons on the adjacent carbon atoms.

Thus if a fragment is −CH2−CH3− then it would show a three proton triplet due to CH3 and a two proton quartet in accordance with N+1 the rule.

(b)

Interpretation Introduction

Interpretation: The various resonances corresponding to 13C NMRofcarbon nuclei found in 1-bromohexane should be assigned.

Concept introduction: The scale used for the NMR spectrum is the delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denoting downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogens.

Thus if a fragment is −CH2−CH3− then it would show two carbon signals for each of theses carbon.

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Experiment: Each team will be provided with 5g of a mixture of acetanilide and salicylic acid. You will divide it into three 1.5 g portions in separate 125 mL Erlenmeyer flasks savıng some for melting point analysis. Dissolve the mixture in each flask in ~60mL of DI water by heating to boiling on a hotplate. Take the flasks off the hotplate once you have a clear solution and let them stand on the bench top for 5 mins and then allow them to cool as described below. Sample A-Let the first sample cool slowly to room temperature by letting it stand on your lab bench, with occasional stirring to promote crystallization. Sample B-Cool the second sample 1n a tap-water bath to 10-15 °C Sample C-Cool the third sample in an ice-bath to 0-2 °C Results: weight after recrystalization and melting point temp. A=0.624g,102-115° B=0.765g, 80-105° C=1.135g, 77-108 What is the percent yield of A,B, and C.

Answer 2

Question

Chapter 10.5, Problem 18E

(a)

Interpretation Introduction

Interpretation: The various resonances corresponding to 1H NMR of hydrogen nuclei found in 1-bromohexane should be assigned.

Concept introduction:The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen.

The area within each peak corresponds to the number of equivalent protons found at that chemical shift values.

Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1H NMR spectra is as follows:

Number of peaks=N+1

Where,

N is the number of equivalent protons on the adjacent carbon atoms.

Thus if a fragment is −CH2−CH3− then it would show a three proton triplet due to CH3 and a two proton quartet in accordance with N+1 the rule.

(b)

Interpretation Introduction

Interpretation: The various resonances corresponding to 13C NMRofcarbon nuclei found in 1-bromohexane should be assigned.

Concept introduction: The scale used for the NMR spectrum is the delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denoting downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogens.

Thus if a fragment is −CH2−CH3− then it would show two carbon signals for each of theses carbon.

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Answer 3

Question

Chapter 10.5, Problem 18E

(a)

Interpretation Introduction

Interpretation: The various resonances corresponding to 1H NMR of hydrogen nuclei found in 1-bromohexane should be assigned.

Concept introduction:The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen.

The area within each peak corresponds to the number of equivalent protons found at that chemical shift values.

Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1H NMR spectra is as follows:

Number of peaks=N+1

Where,

N is the number of equivalent protons on the adjacent carbon atoms.

Thus if a fragment is −CH2−CH3− then it would show a three proton triplet due to CH3 and a two proton quartet in accordance with N+1 the rule.

(b)

Interpretation Introduction

Interpretation: The various resonances corresponding to 13C NMRofcarbon nuclei found in 1-bromohexane should be assigned.

Concept introduction: The scale used for the NMR spectrum is the delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denoting downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogens.

Thus if a fragment is −CH2−CH3− then it would show two carbon signals for each of theses carbon.

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Answer 4

Question

Chapter 10.5, Problem 18E

(a)

Interpretation Introduction

Interpretation: The various resonances corresponding to 1H NMR of hydrogen nuclei found in 1-bromohexane should be assigned.

Concept introduction:The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen.

The area within each peak corresponds to the number of equivalent protons found at that chemical shift values.

Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1H NMR spectra is as follows:

Number of peaks=N+1

Where,

N is the number of equivalent protons on the adjacent carbon atoms.

Thus if a fragment is −CH2−CH3− then it would show a three proton triplet due to CH3 and a two proton quartet in accordance with N+1 the rule.

(b)

Interpretation Introduction

Interpretation: The various resonances corresponding to 13C NMRofcarbon nuclei found in 1-bromohexane should be assigned.

Concept introduction: The scale used for the NMR spectrum is the delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denoting downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogens.

Thus if a fragment is −CH2−CH3− then it would show two carbon signals for each of theses carbon.

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Answer 5

Chapter 10.5, Problem 18E

(a)

Interpretation Introduction

Interpretation: The various resonances corresponding to 1H NMR of hydrogen nuclei found in 1-bromohexane should be assigned.

Concept introduction:The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen.

The area within each peak corresponds to the number of equivalent protons found at that chemical shift values.

Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1H NMR spectra is as follows:

Number of peaks=N+1

Where,

N is the number of equivalent protons on the adjacent carbon atoms.

Thus if a fragment is −CH2−CH3− then it would show a three proton triplet due to CH3 and a two proton quartet in accordance with N+1 the rule.

(b)

Interpretation Introduction

Interpretation: The various resonances corresponding to 13C NMRofcarbon nuclei found in 1-bromohexane should be assigned.

Concept introduction: The scale used for the NMR spectrum is the delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denoting downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogens.

Thus if a fragment is −CH2−CH3− then it would show two carbon signals for each of theses carbon.

Answer 6

Chapter 10.5, Problem 18E

(a)

Interpretation Introduction

Interpretation: The various resonances corresponding to 1H NMR of hydrogen nuclei found in 1-bromohexane should be assigned.

Concept introduction:The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen.

The area within each peak corresponds to the number of equivalent protons found at that chemical shift values.

Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1H NMR spectra is as follows:

Number of peaks=N+1

Where,

N is the number of equivalent protons on the adjacent carbon atoms.

Thus if a fragment is −CH2−CH3− then it would show a three proton triplet due to CH3 and a two proton quartet in accordance with N+1 the rule.

Answer 7

Chapter 10.5, Problem 18E

(a)

Interpretation Introduction

Interpretation: The various resonances corresponding to 1H NMR of hydrogen nuclei found in 1-bromohexane should be assigned.

Concept introduction:The scale used for the NMR spectrum is delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denote downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogen.

The area within each peak corresponds to the number of equivalent protons found at that chemical shift values.

Spin-spin splitting is observed as a result of the interaction amongst non-equivalent NMR active nuclei. This is independent of the strength of the external magnetic field. The formula to calculate the number of peaks in the 1H NMR spectra is as follows:

Number of peaks=N+1

Where,

N is the number of equivalent protons on the adjacent carbon atoms.

Thus if a fragment is −CH2−CH3− then it would show a three proton triplet due to CH3 and a two proton quartet in accordance with N+1 the rule.

Answer 8

(b)

Interpretation Introduction

Interpretation: The various resonances corresponding to 13C NMRofcarbon nuclei found in 1-bromohexane should be assigned.

Concept introduction: The scale used for the NMR spectrum is the delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denoting downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogens.

Thus if a fragment is −CH2−CH3− then it would show two carbon signals for each of theses carbon.

Answer 9

(b)

Interpretation Introduction

Interpretation: The various resonances corresponding to 13C NMRofcarbon nuclei found in 1-bromohexane should be assigned.

Concept introduction: The scale used for the NMR spectrum is the delta scale. δ denotes parts per million units. The lower values of δ denote upfield while higher values of δ denoting downfield region. Each peak in the NMR spectrum corresponds to distinct hydrogens.

Thus if a fragment is −CH2−CH3− then it would show two carbon signals for each of theses carbon.

Answer 10

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Answer 11

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Answer 13

Ch. 10.2 - Prob. 1E Ch. 10.2 - Prob. 2E Ch. 10.2 - Prob. 3E Ch. 10.2 - Prob. 4E Ch. 10.2 - Prob. 5E Ch. 10.2 - Prob. 6E Ch. 10.2 - Prob. 7E Ch. 10.2 - Prob. 8E Ch. 10.2 - Prob. 9E Ch. 10.2 - Prob. 10E

Solution Summary: The author explains the different resonances of hydrogen nuclei found in 1-bromohexane should be assigned.

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