Click here to load reader

13C NMR Interpretation - West Virginia jpenn/Chem_233_Web_Files/13C NMR Interpretation.pdf · PDF fileQuestion 1 Answer Set Step 1: Narrow the list of possibilities with the number

  • View
    6

  • Download
    1

Embed Size (px)

Text of 13C NMR Interpretation - West Virginia jpenn/Chem_233_Web_Files/13C NMR...

  • 13C NMR Interpretation

  • 13C NMR Shift Values

  • Question 1

    • A compound has a molecular formula of C5H8O2 and exhibits the following 13C NMR spectrum; �; 199.83, 197.54, 29.22, 23.70, 6.95. Which of the compounds listed below would be consistent with this structure?

    • Hint #1: Count the number of peaks – 5 peaks

  • Question 1 Answer Set

    Step 1: Narrow the list of possibilities with the number of possible peaks

  • Question 1 Answer Set

    3 peaks

    3 peaks

  • Question 1 Answer Set

    Step 2: What should the 13C NMR spectrum look like?

  • Choice 1

    171.42

    69.47

    29.84

    22.31

    19.06

  • Choice 2

    166.18

    130.31

    128.88

    60.48

    14.28

  • Choice 3

    170.67

    132.50

    118.09 65.19

    20.81

  • Choice 4

    27.72

    197.21

    106.85

    163.49

    57.54

  • Choice 5

    171.48

    141.42

    97.34

    27.33

    8.80

  • Choice 6

    199.83

    197.54

    23.70

    29.22

    6.95

  • Question 1 Answer Set

    Final step: The choice looking most similar to expectations

  • Question 2

    • A compound exhibits the following 13C NMR spectrum: �; 171.42, 69.47, 29.84, 22.31, 19.06 Which of the compounds listed below would be consistent with this structure?

    • Hint #1: Count the number of peaks – 5 peaks

  • Question 2 Answer Set

    Step 1: Narrow the list of possibilities with the number of possible peaks

  • Question 2 Answer Set

    4 peaks

    4 peaks 3 peaks

    3 peaks

  • Reconfirm your choice with expectations

    171.42

    69.47

    29.84

    22.31

    19.06

  • Question 2 Answer Set

  • Question 3

    • A compound has a molecular formula of C8H10 and exhibits the following 13C NMR spectrum; �; 136.42, 129.63, 125.85, 19.66 . Which of the compounds listed below would be consistent with this structure?

    • Hint #1: Count the number of peaks – 4 peaks

  • Question 3 Answer Set

    Step 1: Narrow the list of possibilities with the number of possible peaks

  • Question 3 Answer Set

    Step 1: Narrow the list of possibilities with the number of possible peaks

    6 peaks

    3 peaks 5 peaks

  • Question 3 Choice 1

    64.89

    78.69

    13.01

    13.53

    Mirror plane

  • Question 3 Choice 2

    125.85

    129.63

    136.42 19.66

    Mirror plane

  • Question 3 Answer Set

    Step 1: Narrow the list of possibilities with the number of possible peaks

Search related