4 H NMR Spectra of Unknown (7 points) List the peaks present in the 1H NMR spect

Question

4 H NMR Spectra of Unknown (7 points) List the peaks present in the 1H NMR spectrum of your unknown from highest to lowest chemical shift. For each peak, list the number of protons it represents in the overall structure, its splitting (i.e. singlet, doublet, etc.), and the number of neighboring H atoms. Finally, list the chemical shift of the peak in the 13C NMR for the carbon to which the proton in question is bonded If a single carbon peak cannot be conclusively determined, list all possible candidates. H Chemical Shift of H atoms Splitting of neighbor H atoms '3C Chemical Shift(s)

Explanation / Answer

Sl. No

Chemical shift value in ppm

Number of hydrogen’s

Splitting

Number of neighbor hydrogen’s

13C Chemical shift

1

5.76

1H

Multiplet (m)

>3H

129.7

2

5.48

1H

Doublet of doublet (dd)

2H

128.7

3

4.77

1H

Doublet (d)

1H

1.01

4

3.58

2H

Pentet (p)

4H

60.9

5

3.44

2H

Pentet (p)

4H

60.9

6

1.68

3H

Doublet (d)

2H

17.5

7

1.16

6H

Triplet

6H

15.1

Sl. No

Chemical shift value in ppm

Number of hydrogen’s

Splitting

Number of neighbor hydrogen’s

13C Chemical shift

1

5.76

1H

Multiplet (m)

>3H

129.7

2

5.48

1H

Doublet of doublet (dd)

2H

128.7

3

4.77

1H

Doublet (d)

1H

1.01

4

3.58

2H

Pentet (p)

4H

60.9

5

3.44

2H

Pentet (p)

4H

60.9

6

1.68

3H

Doublet (d)

2H

17.5

7

1.16

6H

Triplet

6H

15.1

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