Assign the peaks in your spectrum by: (1) drawing what you think the structure of the product is directly on your spectrum; (2) identifying the protons with code letters (e.g., “Ha”, “Hb”, “Hc”, etc.), but grouping protons that give rise to the same signal under the same label; (3) writing “Ha”, “Hb”, “Hc”, etc., near the appropriate peaks so that the assignment is clear; (4) identifying impurity peaks.
Homework Answers
Answer
- The NMR spectrum showed the following signals
|
δ (ppm) |
Splitting |
Integration |
Assignation |
|
|
Ha |
0.89 |
triplet |
3H |
-CH3 group adjacent to a -CH2- group (CH3-CH2-R) |
|
He |
1.28 |
24H |
-CH2- group |
|
|
Hd |
1.61 |
2H |
-CH2- group in β positon respect to a carbonyl (R-CH2-CH2-COOH) |
|
|
Hc |
2.30 |
triplet |
2H |
-CH2- group adjacent to a carbonyl group and a -CH2- group (R-CH2-CH2-COOH) |
|
Hb |
3.65 |
singlet |
3H |
-CH3 group adjacent to an oxygen atom (CH3-O-) |
These signal indicates that the compound is an methyl ester and the proposed structure is:
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draw structure of C8H10 and C8H8O2 based on the 1HNMR AND 13C-NMR
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please scroll for all lictures!
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