HW 4 Multinuclear NMR Name:
Points: C6800 Date:
Max. 100 points Spring 2011 Version A
1. Fluorinated ethers are used as anestethics. Give number of signals, integral intensities,
splitting patterns (multiplicity) and relative intensities of lines in the multiplets in their 1
H and
19
F NMR spectra. Find and classify the geminal groups. Consider only three-bond scalar
coupling.
a) Isoflurane CF3CHClOCHF2
b) Desflurane CF3CHFOCHF2
c) Enflurane CHClFCF2OCHF2
d) Sevoflurane (CF3)3CHOCH2F
2. For the non-, mono-, and disubstituted B12H12
2molecules
with identical substituents SCN
consider 11
B NMR spectra and give:
A) Symmetry point group of the molecules
a) b) c) d) e)
C2v
B) Number of groups of equivalent 11
B atoms
a) b) c) d) e)
1
C) Relative intensities of the signals
a) b) c) d) e)
D) Use the numbering scheme in a) and list atoms in equivalent groups
a) b) c) d) e)
B1 – B12