NMR - structural analysis: TEST 1
1. Figure bellow shows not-decoupled 13
C NMR spectrum of mixture of CCl2HxD2-x.
a) Assign the central position of individual multiplets to chemical shifts of various isotopomers.
b) Provide estimate of 1
JC-H/D coupling constants
c) Explain the ratio of intensities within the multiplets.
2. 1
H spectrum of a heterocyclic compound (structure indicated in left-upper corner):
a) Determine the working frequency of a NMR spectrometer used for recording this spectrum.
b) Provide systematic name of analysed compound and probable type of solvent.
c) Determine relative orientation of F atoms (cis or trans), explain.
d) Assign the proton signals (keep in mind 19
F is ½ NMR active nucleus exhibiting strong deshielding
and large 2
JHF coupling).
e) Carefully interpret splitting of signals.