Chapter 16.4, Problem 2ATS

(a)

Interpretation Introduction

Interpretation: For a given molecule the number of signals expected in ${}^{\text{1}}\text{H}\text{NMR}$ spectrum to be identified.

Concept Introduction:

Homotopic: If the protons are interchangeable through rotational symmetry, then the protons are chemically equivalent and termed as homotopic.

Enantiotopic:  If the protons are interchangeable through reflectional symmetry, then the protons are chemically equivalent and termed as Enantiotopic.

Diastereotopic: If the protons are not interchangeable through either of the symmetry operations, then the protons are Diastereotopic; the protons are not chemically equivalent if a chiral center present in the molecule.

 (b)

Interpretation Introduction

Interpretation: For a given molecule the number of signals expected in ${}^{\text{1}}\text{H}\text{NMR}$ spectrum to be identified.

Concept Introduction:

Homotopic: If the protons are interchangeable through rotational symmetry, then the protons are chemically equivalent and termed as homotopic.

Enantiotopic:  If the protons are interchangeable through reflectional symmetry, then the protons are chemically equivalent and termed as Enantiotopic.

Diastereotopic: If the protons are not interchangeable through either of the symmetry operations, then the protons are Diastereotopic; the protons are not chemically equivalent if a chiral center present in the molecule.

(c)

Interpretation Introduction

Interpretation: For a given molecule the number of signals expected in ${}^{\text{1}}\text{H}\text{NMR}$ spectrum to be identified.

Concept Introduction:

Homotopic: If the protons are interchangeable through rotational symmetry, then the protons are chemically equivalent and termed as homotopic.

Enantiotopic:  If the protons are interchangeable through reflectional symmetry, then the protons are chemically equivalent and termed as Enantiotopic.

Diastereotopic: If the protons are not interchangeable through either of the symmetry operations, then the protons are Diastereotopic; the protons are not chemically equivalent if a chiral center present in the molecule.

(d)

Interpretation Introduction

Interpretation: For a given molecule the number of signals expected in ${}^{\text{1}}\text{H}\text{NMR}$ spectrum to be identified.

Concept Introduction:

Homotopic: If the protons are interchangeable through rotational symmetry, then the protons are chemically equivalent and termed as homotopic.

Enantiotopic:  If the protons are interchangeable through reflectional symmetry, then the protons are chemically equivalent and termed as Enantiotopic.

Diastereotopic: If the protons are not interchangeable through either of the symmetry operations, then the protons are Diastereotopic; the protons are not chemically equivalent if a chiral center present in the molecule.

(e)

Interpretation Introduction

Interpretation: For a given molecule the number of signals expected in ${}^{\text{1}}\text{H}\text{NMR}$ spectrum to be identified.

Concept Introduction:

Homotopic: If the protons are interchangeable through rotational symmetry, then the protons are chemically equivalent and termed as homotopic.

Enantiotopic:  If the protons are interchangeable through reflectional symmetry, then the protons are chemically equivalent and termed as Enantiotopic.

Diastereotopic: If the protons are not interchangeable through either of the symmetry operations, then the protons are Diastereotopic; the protons are not chemically equivalent if a chiral center present in the molecule.