 |
113 |
|
Answer: |
 |
Reasoning:
For both given options the number of signals and the expectations ranges for
the chemical shifts are identical. The similarities even extend into the
fine structure of the signals (two triplets and one singulet if we ignore
the aromatic protons for now). However, we can expect significant
differences for the chemical shift of the methyl group, depending on
whether we deal with molecule a) or b).
| Verbindung |
Equivalent protons |
d [ppm] (expected) |
d [ppm] (observed) |
Multiplicity (expected) |
Multiplicity (observed) |
|
C6H5-CH2-CH2-O-CO-CH3
|
-CO-CH3
C6H5-CH2-
-CH2-O- |
1.7 ... 2.7
2.4 ... 3.3
3.3 ... 4.6 |
2.0
2.9
4.3 |
1
3
3 |
1
3
3 |
|
C6H5-CH2-CH2-CO-O-CH3
|
-CH2-CO-
C6H5-CH2-
-O-CH3 |
1.9 ... 3.2
2.4 ... 3.3
3.3 ...4.1 |
4.3
2.9
2.0 |
3
3
1 |
3
3
1 |
Was that difficult for you? If so, you might want to review the
relevant sections.
No Problems?! We'll give you problems!
|
|
|
|
