Chemistry Reference
In-Depth Information
Fig. 9.6
Simplified
13
C-NMR spectra and mass spectra of the substances A-F
- Only one signal (not two) can be expected in the
13
C-NMR-spectrum, when
starting from hypothesis H1 and H3. Therefore, these hypotheses are not suit-
able. Only H2 is compatible with the
13
C-NMR spectrum.
- Hypothesis H2 can also explain the other signals in the mass spectrum (29 u, 31
u, 45 u), because the corresponding fragments are contained in the formula H2.
The spectra of the five other substances can be analyzed in the same way [
17
].
A mass table that shows the most important molecular fragments, arranged
according to their masses, should be available for the students as a tool
(Fig.
9.7
). The results are shown in Fig.
9.8
.
