One can see the two spin systems on either side of the carbonyl group, color coded in yellow and pink. The second panel shows an expansion of the region within the red square of the first panel. Here we can separate the overlapping quartet and triplet for the methylene protons on either side of the carbonyl group.
Protons a, b, c and d constitute one spin system, an unbroken network of coupled protons. The ethyl group, e and f, constitutes a second, separate spin system, because there is no coupling between a and e, across the carbonyl.
In a COSY spectrum, CH2 a would show a correlation to CH2 b. In a TOCSY spectrum, it would also show correlations to CH2s c and d.
RAMAN
13 C NMR
MASS
IR
1H NMR
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