Chapter 15, Problem 39PP

(a)

Interpretation Introduction

Interpretation: The given compounds to be distinguished using both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy.

Concept Introduction:

Both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy gives information on the different electronic environments of carbon and protons respectively. As like ${}^{\text{1}}\text{H}\text{NMR}$, the number of signals generated in ${}^{\text{13}}\text{C}\text{NMR}$ are predicted by performing symmetry operations (rotation or reflection symmetry). Only chemical shift values are reported in the spectrum but not the multiplicity and integration values because the coupling between two neighboring ${}^{\text{13}}\text{C}{-}^{\text{13}}\text{C}$ nuclei are weakly involved due to the low abundance of ${}^{\text{13}}\text{C}$ isotopes of carbon atom.

(b)

Interpretation Introduction

Interpretation: The given compounds to be distinguished using both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy.

Concept Introduction:

Both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy gives information on the different electronic environments of carbon and protons respectively. As like ${}^{\text{1}}\text{H}\text{NMR}$, the number of signals generated in ${}^{\text{13}}\text{C}\text{NMR}$ are predicted by performing symmetry operations (rotation or reflection symmetry). Only chemical shift values are reported in the spectrum but not the multiplicity and integration values because the coupling between two neighboring ${}^{\text{13}}\text{C}{-}^{\text{13}}\text{C}$ nuclei are weakly involved due to the low abundance of ${}^{\text{13}}\text{C}$ isotopes of carbon atom.

(c)

Interpretation Introduction

Interpretation: The given compounds to be distinguished using both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy.

Concept Introduction:

Both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy gives information on the different electronic environments of carbon and protons respectively. As like ${}^{\text{1}}\text{H}\text{NMR}$, the number of signals generated in ${}^{\text{13}}\text{C}\text{NMR}$ are predicted by performing symmetry operations (rotation or reflection symmetry). Only chemical shift values are reported in the spectrum but not the multiplicity and integration values because the coupling between two neighboring ${}^{\text{13}}\text{C}{-}^{\text{13}}\text{C}$ nuclei are weakly involved due to the low abundance of ${}^{\text{13}}\text{C}$ isotopes of carbon atom.

 (d)

Interpretation Introduction

Interpretation: The given compounds to be distinguished using both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy.

Concept Introduction:

Both ${}^{\text{13}}\text{C}\text{NMR}$ and ${}^{\text{1}}\text{H}\text{NMR}$ spectroscopy gives information on the different electronic environments of carbon and protons respectively. As like ${}^{\text{1}}\text{H}\text{NMR}$, the number of signals generated in ${}^{\text{13}}\text{C}\text{NMR}$ are predicted by performing symmetry operations (rotation or reflection symmetry). Only chemical shift values are reported in the spectrum but not the multiplicity and integration values because the coupling between two neighboring ${}^{\text{13}}\text{C}{-}^{\text{13}}\text{C}$ nuclei are weakly involved due to the low abundance of ${}^{\text{13}}\text{C}$ isotopes of carbon atom.