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1
H NMR Spectroscopy
42
Do the following excercise to practice these calculations:
Using TMS as a reference, what resonance frequencies are equivalent to the
d
values of ethylbenzene at a spectrometer frequency of
a) 250 MHz
and
b) 400 MHz
d
CH
3
=
1,1 ppm
d
CH
2
=
2,5 ppm
d
CH
aromatic
=
7,1 ppm
Check
here
for the correct answer!